Friday, September 6, 2019
Societal Standards Essay Example for Free
Societal Standards Essay Imagine a 62 man with broad shoulders, deep voice, hairy body, masculine personality, and pink glittery nail polish. His friends give him a hard time about it, they say that he is not a real man. He decides to hang out with more woman and when more and more people start to consider him gay, he becomes it. Men do not have the wiggle room to explore the feminine stereotypes. Masculine stereotypes are more confining than feminine stereotypes in the social and professional world. Social masculine stereotypes are more confining than feminine stereotypes. Men are more strictly contained while women are more open to explore a variety of stereotypes. In a recent, USA Today article Gender Stereotypes author Seine Wenig writes on a strict line drawn between masculine and female stereotypes. Yet how this line is slowly fading the woman. Wenig reiterates how for girls There is ample room to maneuver and how Ever-growing range of tomboys sports options which in the past were mostly the domain of boys. Girls can now be free and engage in activities and sports which boys dominate. While male stereotypes and stereotypical fathers cause men to have a more confined space in which they could explore and move due to the fact that stereotypical fathers expect athletic success rather than academic success. Girls are Given more room to explore their counterparts culture while males are stuck in a much tighter box to move about in meaning they are not able to explore the feminine stereotypes. Therefore ,masculine stereotypes are more confined than feminine stereotypes in the social aspect. Masculine stereotypes are more professionally confining than feminine stereotypes. There are fewer choices for careers for men that then for women due to stereotypes. In a 2011 article from USA Today, Gender Stereotypes Easing More for Girls than Boys. Author Seth Wenig describes the ultimate confinement for men in the professional mainstream society. He restates how, women now make up close to half to enrollment in US law and medical schools up from 25% a few decades ago. Now due to the ever-changing world girls now have more choices for careers then their male counterparts. More females are going and graduating from schools which prepare them for a lifelong career not just being nurse as it was thought to be in the past. Men choose not to be nurses because main stream society would not find being a nurse very masculine because it is a mostly female occupied feel due to the fact it has to do with the Female stereotype of caring for another human being. Women are given more opportunities than men to succeed in the professional world, which leave men with fewer choices for careers. Therefore masculine stereotypes are more professionally confining than feminine stereotypes. Addressing the problems of social standards of man and woman requires the ultimate settlement of what it means to be a man and what it what it means to be a woman. Men do not have them of wiggle room to explore the female stereotypes while free to roam all round all stereotypes. When a female try to succeed in a mostly male dominant profession, she is led to shine while when a man tries to do the same he is shun. If men continue to be confined by so societal standards, this will cause a civilization in which it is easier to be a woman than to be a man. Leading men to either join the female standard and gender or collapse under the confinement of their own standards.
Thursday, September 5, 2019
Women in World War II
Women in World War II The changes that women underwent in the late 1930s and early 1940s would be felt by generations to come. Many women lives changed in many ways during World War II. Men went to war and went to work in factories in other parts of the country. With fewer men in the workforce, women had to fill more traditionally male jobs and had to pick up their husbands responsibilities. Most women thought there place was to be in the home and to take care of the wounded soldiers. Their main responsibility was cooking, cleaning, taking care of the children, and looking her best. Women were not only asked to complete daily chores and responsibilities that were normally expected of them, instead they were asked to go to work during war time. So when the war broke out, and it was clear that America would not be able to win the war without the help of their women. The traditional housewives and mothers turned into wartime workers. During World War II, many women found that their roles, opportunities, and responsibilities expanded dramatically. When World War II started, everyone agreed that workers were needed. They also agreed that having women work in the industries would be temporary. But the United States government had to overcome challenges to recruit women to the workforce. So the government decided to launch a propaganda campaign to sell the importance of the war effort and to lure women into working. When most men went off to fight, women were left to pick up the work the men left behind and forcing wives and mothers to keep life running smoothly. It was soon realized that, no matter how untraditional or unfeminine it was for a woman to work outside the home, it would have to be done. Women worked in all manner of production ranging from making ammunition to uniforms to aeroplanes. The hours they worked were long and some women had to move to where the factories were. Those who moved away were paid more. More than 1,000 women served as pilots associated with the US Air Force in the WASP (Women Airforce Ser vice Pilots) but were considered civil service workers, and werent recognized for their military service until the 1970s.(Lewis) Women became welders and riveters in the aircraft, shipbuilding, and ordnance industries, demonstrating their competence in what were male jobs. Women faced inequality while they went to work in industries. Management denied them equal status in the workplace. Women often encountered hostility from male coworkers and managers. Segregation by gender was common on the shop floor, and separate seniority lists were kept for men and women. They were also paid a lower wage than what I man would get paid. Even though women faced inequality they had jobs as mechanics, engineers, tank drivers, plumbers, building ships, and making bombs and aircraft parts during the war. As women were the managers of the home, the shortage of domestic resources fell more heavily on women to provide. Womens shopping and food preparation habits were affected by having to deal with stamps or other rationing methods, as well as the increased likelihood that she was working outside the home in addition to her homemaking responsibilities. Suddenly as a result of the war much of the supplies that a housewife used to complete her everyday chores were gone. A 1940s housewife could not buy a staple like sugar at the grocery store, because the sugar cane supply was significantly diminshed. What sugar was left was vital to the war effort, because it makes molasses; molasses makes ethyl alcohol; and alcohol makes the powder which fires guns and serves as Torpedo fuel, dynamite, nitrocotton, and other chemicals desperately needed by the American military. The availability of this product to the American people was very limited and as a result it was considered a rationed item. Man y worked in volunteer organizations connected with the war effort. Women were urged by organized propaganda campaigns to practice helping the economy by carrying groceries instead of using the car to preserve tire rubber for the war effort, to grow more of their family food in victory gardens, to sew and repair clothing rather than buying new clothes, raise money and contribute to war bonds, and give confidence of the war effort through sacrifice. However, more than 59,000 American nurses served in the Army Nurse Corps during World War II.(Osborn) Nurses worked closer to the front lines than they ever had before. With establishment of the Army Medical Department during the war, nurses served under fire in field and evacuation hospitals, trains, and ships, and as flight nurses on medical transport planes. The skill and work of these nurses contributed to low injuries among American military forces in every part of the war. Only a small number of black nurses were accepted in the Army Nurse Corps during World War II because of the Quota System. It was imposed by the segregated army during the two years of the war which held down the number of black enrollments. The Army limited the number of black nurses in the Nurse Corps to 160.(Osborn) Army authorities argued that assignments available to black nurses were limited because they were only allowed to care for black troops in black wards or hospitals. American soldiers who receiv ed care but could not be helped either died from wounds or diseases. The Womens Army Corps was successful because its mission, to aid the United States in time of war, was part of a larger national effort that required selfless sacrifice from all Americans. The war effort initiated vast economic and social changes, and indelibly altered the role of women in American society. As a result, when the United States entered the war, 12 million women were already working and by the end of the war, the number was up to 18 million due to the promoting of the fictional character Rosie the Riveter as the ideal worker: loyal, efficient, patriotic, and pretty. Women responded to the call to work differently depending on race, age, class, marital status, and number of children.(Gluck) Half of the women that took the jobs were minority or lower-class women who were already in the workforce. They switched from low paying jobs to higher factory paying jobs. But with the women they had, it was not enough they recruited women that were graduating from high school. The demands in the labor market were so severe that women with children under six took the jobs. They did not really want married women with young children even if they were needed because their husbands would not want them to work in factories or industries. They were known as homemakers, which stayed home and c ared for the family. The government feared that the rise in working mothers would increase the rise in juvenile delinquency. Most women would quit their job if they were not happy with their pay, location, or environment. Unlike men, women suffered from double shift of work and caring for the family at home. Some working mothers had childcare problems and the public blamed them for the rise in juveniles behaviors. 90% of the mothers thought they could best serve the war effort by staying at home.(Hartmann) Women enjoyed working in male jobs but did not like the changes in mens attitudes. The women faced harrasment, teasing, and unwanted advances. One of the reason that men resented women in the workplace was because, in the absence of a male majority, females demonstrated that they could survive without the domination and supervision of men. Men tried at every opportunity to return women to their proper place in the home and in society. Male employees were su spicious of women. Companies saw those womens needs and desires on the job as secondary to mens, so they were not taken seriously or given much attention. In addition, male employers denied women positions of power excluding them from the decision-making process of the company. Women wanted to be treated like the male workers and not given special consideration just because they are women. As time went on, more women entered the workforce and the attitude towards women changed. The employers praised them. As in every war, some spies and resistance fighters were women. Besides the obvious ability of women to use sexual favors and blackmail to get secrets, the image of womens purity and morality worked against suspicion of women. The wonderful needs faced by the United States during World War II created numerous new social and economic opportunities for American women. Both society as a whole and the United States military found an increasing number of roles for women. As large numbers of women entered industry and many of the professions for the first time, the military service took men and women from small towns and large cities across America and transported them around the world. After the war, many women remained in the workforce but employers forced them back to lower-paying female jobs. Most women were laid off and told to go back their homes and take care of the families. Their wartime experiences broadened their lives as well as their expectations.
Wednesday, September 4, 2019
Cryptography: Theories, Functions and Strategies
Cryptography: Theories, Functions and Strategies Abstract Digital signing is a mechanism for certifying the origin and the integrity of electronically transmitted information. In the process of digitally signing, additional information called a digital signature is added to the given document, calculated using the contents of the document and some private key. At a later stage, this information can be used to check the origin of the signed document. The mathematical base of the digital signing of documents is public key cryptography. This work presents the theory behind digital signatures, signature schemes and attacks on signatures and provides a survey of application areas of the digital signing technology. Moreover, there are lab exercises developed in Mathlab, to reinforce the understanding of this technology. 1. Introduction The Concise Oxford Dictionary (2006) defines cryptography as the art of writing or solving codes, however modern cryptography does not met this definition. Therefore, this work starts with a literature review defining some key concepts, like what cryptography and cryptographic system are and the different types of cryptographic system are presented. The other interesting and preliminary concept is the notion of cryptosystem functions which are also discussed in the introductory section. Furthermore, it is stated that public-key encryption represents a revolution in the field of cryptography, and this work poses some basic definitions on this topic trying to explain the theory behind. The rest of the literature review is concentrated on public key cryptography and it focuses on the theory behind digital signatures, signature schemes and attacks on signatures. And finally, the literature review presents a survey of application areas on digital signatures. One part of the contribution of this work, is an overview of the secure hash standard (SHS) and implementation of the secure hash algorithm (SHA-1), required for use with digital signature algorithms. The main part though, is the implementation of AES and RSA by utilizing Mathlab. The code of all these implementations is thoroughly discussed and explained in this work. Moreover, a comparison is also presented subsequently. 2. Cryptography The Greek words â€Å"krypt ´os†standing for â€Å"hidden†and the word â€Å"l ´ogos†that means â€Å"word†, are in essence the base from where the word cryptology was derived. As these words denote, cryptology can be best explained by the meaning â€Å"hidden word†. In this context, the original purpose behind cryptology is hiding the meaning of some specific combination of words which in turn would insure secrecy and confidentiality. This is a very limited viewpoint in today’s perspective and a wide range of security applications and issues now come under the term of cryptology (rest of the portion of this section will clarify this point of view). As field of mathematical science, Cryptology includes the study of both cryptanalysis as well as cryptography. On one hand, cryptography is a very broad term and represents any process used for data protection. On the other hand, the study of security related issues and the probabilities of breaking the cryptographic systems and a technique is known as cryptanalysis. By making reference to (Shirey, 2000), the field cryptanalysis can be best described as the â€Å"mathematical science that deals with analysis of a cryptographic system in order to gain knowledge needed to break or circumvent the protection that the system is designed to provide.†In simple words, cryptanalyst can be regarded as the opponent of the cryptographer i.e. he/she has to get around the security which cryptographer devised on his/her part. (Buchmann, 2004) claims that a cryptographic system (or in short a cryptosystem) describes â€Å"a set of cryptographic algorithms together with the key management processes that support use of the algorithms in some application context.†This is a diverse explanation that includes all sorts of cryptographic algorithms as well as protocols. However, hidden parameters like cryptographic keys may or may not be used by a cryptographic system (Delfs, 2007). Similarly, participants of the undergoing communication may or may not share those secret parameters. Thus, cryptographic can be classified into following three types: a cryptographic system in which no secret parameters are employed (called an un-keyed cryptosystem); a cryptosystem which makes use of secret parameters and at the same time shares the parameters between the participants (known as a secret key cryptographic system); and a system that utilizes the secret parameters, but not sharing them with the participants (call ed a public key cryptographic system) (Shirey, 2000; Buchmann, 2004). Cryptography aims at designing and implementing cryptographic systems and utilizing such systems which are secure effectively. The first a formal definition about the term cryptography dates from relatively past time. Back then, the approach known by the name â€Å"security through obscurity†was being used (Dent, 2004). There are a lot of examples based on this approach by which security of the system was improved by keeping internal working and design secret. Majority of those systems do not serve the purpose and security may well be violated. The Kerckhoffs’ principle is a very famous cryptographic principle which states that (Kerckhoffs, 1883): â€Å"Except for parameters clearly defined to be secret, like the cryptographic keys, a cryptosystem must be designed in such a way as to be secure even with the case that the antagonist knows all details about the system†. However, it might be noted that one important aspect is that a cryptosystem is perfectly securing theoretically grounds, but it may not remain the same when implemented practically. Different possibilities of generating attacks on security of such systems can arise while having the practical implementation (Anderson, 1994). Attacks which make use of exploitation of side channel information are the examples of such attacks. If a cryptosystem is executed, it can result in the retrieval of side channel information with unspecified inputs and outputs (Anderson, 1994). In encryption systems, the input is plaintext message plus the key, while the specific output is the cipher text. Thus, there are chances on information leakage. Power consumption, timing characteristics along with the radiation of all types are some examples in this regard. On the other hand, side channel attacks are the types of network attacks which extract side channel information. Since the mid 1990s there were many di fferent possibilities have been found by the researchers in order to build up side channel attacks. A few examples in this regard are the differential power analysis (Bonehl, 1997), and fault analysis (Biham, 1997; Kocher, 1999) as well as the timing attacks (Kocher, 1996). It is a very practical statement that any computation performed on real computer systems represents some physical phenomena which can be examined and analyzed to provide information regarding the keying material being employed. Cryptography does not help to cope with this situation because of the inherent nature of this problem. 2.1 Cryptosystem functions Other than the usual random bit generators as well as the hash functions, there are no secret parameters that are used in cryptosystem functions. These are the junketed functions that characterize the cryptographic system functions. In cryptographic functions, the elements used are usually one-way and it is difficult or almost impossible to invert them. This follows that it is easy to compute a cryptographic function whereas it is hard to invert the functions and also to compute the results of the relationships (Kerckhoffs, 1883). It is difficult to apply any mathematical method for inverting the cryptographic system functions in a way that will be coherent and meaningful. For example, a cryptographic system functions such as F: X → Y is easy to comfortably use mathematical knowledge to compute while it is hard to use the same to invert (Buchmann, 2004; Shirey, 2000). There are many examples of one-way functions that we can use to demonstrate the meaning of the cryptosystems. In a situation where one has stored numbers on the cell phone, computation of the same is possible and easy due to the fact that the names are stored in an alphabetical manner (Garrett, 2001). If one inverts the relationship of these functions, it will be impossible to compute because the numbers are not arranged numerically in the storage phonebook. It is notable that a lot of other things that we do in daily life are comparable to cryptosystem function in the sense that you cannot invert or undo them. For example, if one breaks a glass, the process is one way because it is not possible for these pieces to be restored together again (Goldreich, 2004). Similarly, when one drops something into water, it is not practically possible to reverse the action of dropping this item (Mao, 2003). The English corresponding action would be to un-drop the item as opposed to picking it. Cry ptosystem functions cannot be demonstrated as purely one-way and this is the branching point between cryptosystem functions and the real world of things and circumstances. The only one-way functions in mathematics can be exemplified by discrete exponentiation, modular power and modular square functions. Public key cryptography uses these functions in its operations but it has not been well documented whether they are really one-way or not. There has been debate in practice whether one-way functions really exist in the first place or not (Garrett, 2001). In the recent day cryptographic discussions a lot of care should be applied when referring to the one-way functions so as not to interfere or make false claims to the functional attributes of these parameters. There is a need to look for extra information and knowledge concerning one-way functions so that efficient and meaningful inversions are possible and mathematically coherent. Therefore, functions such as F: X → Y is considered to be a one-way function (Koblitz, 1994; Schneier, 1996). This follows that if F can successfully and coherently inverted, the need for extra information is needed. This will hence bring the notion of the meaning of the other parameters in relation to F. Computer science uses the hash functions in its operations. This is because these functions are computable and generates output dependent on the input that was used (Katz, 2007; Koblitz, 1994). 3. Digital signatures The public-key encryption presents a revolution in the field of cryptography and until its invention the cryptographers had relied completely on common, secret keys in order to achieve confidential communication (Smart, 2003). On the contrary, the public-key techniques, allow for the parties to communicate privately without the requirement to decide on a secret key in advance. While the concept of private-key cryptography is presented as two parties agree on a secret keyk which can be used (by either party) for both encryption and decryption; public-key encryption is asymmetric in both these respects (Stinson, 2005). Namely, in public-key encryption: One party (the receiver) generates a pair of keys (pk, sk), where pk is called the public key and ps is the private key, The public key is used by a sender to encrypt a message for the receiver, and The receiver uses the private key to decrypt that message. There three parts of information form part of public key certificate: Some naming information A Public key Digital signatures (this can be one or more) Encryptions and digital signatures were introduced to make the web transactions secure and manageable. The use of cryptographic techniques was applied to enhance and provide security layer such that the encrypted information and files would remain secure and confidential. Very frequently, a digital signature is mistaken with the inverse of a public-key encryption, but this is not entirely true. In the history, a digital signature could be obtained by reversing, but today in the majority of the situations this process would be impossible to be performed. Basically, a digital signature is a form of a mathematical scheme for signifying the genuineness of a digital message. A valid digital signature would provide a proof to the person that receives the message or the document that these information is indeed created by a specified sender. Moreover, it would prove that message or the document was not altered during the transportation. Digital signatures are usually used for software distribution or mainly money transactions, where it is very important to detect the possibility of forgery. As a part of the field in asymmetric cryptography, it might be noted that a digital signature is somehow equivalent of the traditional handwritten signatures. On the other hand, in order to be effective, a digital signature should be correctly implemented. Another very important concept is the notion of non-repudiation. This means that if somebody signs a document by using a digital signature, they can not say that it was not signed by them, even though their private key remains as a secret. On the other hand, there is a time stamp, so that even if the private key of a sender is compromised in future, the digital signature will remain valid. Examples of such messages are: electronic mail contracts messages sent via some cryptographic protocol A digital signature usually is comprised of: An algorithm for producing a key. This algorithm would find a private key by chance from all the possible private keys available. Then it will output that private key with a matching public key. A signing algorithm that, given a message and a private key, produces a signature. A signature authenticating algorithm that, given a message, public key and a signature, it will accept or reject the message. Primary, a signature produced from a fixed message and a private key verifies that the genuineness of that message is ok, by means of the matching public key. Then, it has to be computationally infeasible to make an appropriate signature for a party that doesn’t have the private key 4. Algorithms 4.1. Introduction to SHS This section provides an overview of the secure hash standard (SHS) and implementation of the secure hash algorithm (SHA-1), required for use with digital signature algorithms. SHA-1 is used for computing a compressed version of a message or a data file. If that data has a length smaller than 264 buts, then the output will be 160-bit and is called a message digest. The message digest used for an input to the Digital Signature Algorithm (DSA). This algorithm will verify the signature for the message. Signing the message digest instead of the originall message itself, might advance the effectiveness of the procedure. This is since the message digest is usually much slighter in size than the original message. Very important is that the same hash algorithm should be used by both the verifier and the digital signature creator. The usage of the SHA-1 with the DSA can be presented as follows: Interesting for SHA-1 is that it is computationally impossible to discover a message which matchs to a given digest. Moreover, it is also impossible to find two dissimilar messages which create an identical message digest. 4.2. Implementation of SHA-1 The following functions were implemented for the SHA-1 algorithm: Name of source file: secure_hash_algorithm.m. Function in the source file: secure_hash_algorithm (message). This function takes an input a string of characters. Example: Hello, How are you? How is it going on? Output is the message digest, the hash value of the message. Thus, the hash value of the above message is F418F52AE6DC208599F91191E6C40FA876F33754. Name of source file: arithematic_shift_operations.m. Function in the source file: arithematic_shift_operations (number, position, op). The inputs are: number: it is a hexadecimal large number of any size. The number is represented in base 16 and is stored as a string. Ex: ‘FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF’ position: the number of positions to be shifted by. It is a decimal number in base 10. Op: it is the type of operation done. Inputs are ‘SRA’ -> shift right arithematic and ‘SLA’ -> shift left arithematic. For example, the function: arithematic_shift_operations(‘FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF’, 3, ‘SRA’) would return ‘1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF’, and arithematic_shift_operations(‘FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF’, 3, ‘SLA’) would return ‘FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8’. Name of source file: bi2hex.m. Function in the source file: bi2hex (number). The input to this function is a vector of ones and zeros and the result is a hexadecimal output represented in string. For example, for the input â€Å"Number = [1 1 1 1]†bi2hex (Number) returns ‘F’ and for â€Å"Number = [1 1 1 1 0 0 0 1 ]†bi2hex (Number) returns ‘F1’. Name of source file: hex2bi.m. Function in the source file: hex2bi (number). The input to this function is a number stored in form of a string in base 16 and the result is a vector containing the binary representation of input string. For example, for the input â€Å"Number = ‘F’ †, hex2bi (Number) returns â€Å"[1 1 1 1]†and for â€Å"Number = ‘F1’ â€Å", bi2hex (Number) returns â€Å"[1 1 1 1 0 0 0 1]†. Name of source file: hexadecimal_big_number_adder.m. Function in the source file: hexadecimal_big_number_adder (number_one, number_two). The inputs to this function are numbers stored in hexadecimal string format. Output is the result, a hexadecimal string and carry, a decimal number. After using this function, it has to be checked if the carry is generated, Incase if it is generated then the carry has to be appended in the beginning to the result. For example: Number_one = ‘FFFFFFFF’ Number_two = ‘EEEEEEEE’ [result, carry] = hexadecimal_big_number_adder (Number_one, Number_two) Result = ‘EEEEEEED’ , carry = 1; Hence the real sum is Result = strcat(dec2hex(0), Result); this results to ‘1EEEEEEED’ Name of source file: hexadecimal_big_number_subtractor.m. Function in the source file: hexadecimal_big_number_subtractor(number_one, number_two). The inputs to this function are numbers stored in hexadecimal string format. Output is the result, a hexadecimal string and sign, a decimal number. If sign is -1, then the result generated is a negative number else is a positive number. . For example: Number_one= ‘EEEEEEEE’ Number_two= ‘FFFFFFFF’ [result, sign] = hexadecimal_big_number_subtractor(Number_one, Number_two) Result = ‘11111111’ Sign = -1. Name of source file: hexadecimal_big_number_multiprecision_multiplication.m. Function in the source file: hexadecimal_big_number_multiprecision_multiplication(multiplicand, multiplier). The input is a multiplicand stored in string format is a hexadecimal number. And so is multiplier. The output is a result and is stored in form of a string. For example: multiplicand= ‘EEEEEEEE’ multiplier= ‘FFFFFFFF’ hexadecimal_big_number_multiprecision_multiplication(multiplicand, multiplier) result is ‘EEEEEEED11111112’ Name of source file: comparision_of.m. Function in the source file: comparision_of(number_one, number_two, index). This function compares two numbers in hexadecimal format stored in form of strings. Always input index as decimal 1. Therefore, it: Returns 1 if Number_one > Number_two, Returns 0 if Number_one = Number_two, and Returns -1 if Number_one For example, if Number_one= ‘EEEEEEEE’ Number_two= ‘FFFFFFFF’, the result would be: comparision_of(Number_one, Number_two, 1) returns -1. Name of source file: hexadecimal_big_number_modular_exponentiation.m. Function in the source file: hexadecimal_big_number_modular_exponentiation (base, exponent, modulus). This function calculates (power(base, exponent) % modulus). Here the input base, exponent and modulus are hexadecimal strings of any size. For example: Base = ‘FFF’ Exponent = ‘EEE’ Modulus = ‘AAAA’ hexadecimal_big_number_modular_exponentiation (Base, Exponent, Modulus) returns ‘8BAB’ Name of source file: hexadecimal_big_number_multiplicative_inverse.m. Function in the source file: Z = hexadecimal_big_number_multiplicative_inverse(number_one, number_two). This function returns multiplicative inverse of number_two modulo number_one. If az = 1 (mod m) then z is the multiplicative inverse of a mod m. Here â€Å"number_one = m†, â€Å"number_two = a†, â€Å"number_one = ‘FFFF’ †, â€Å"number_two = ‘1235’ â€Å" andresult is ‘634D’, which in turn is the multiplicative inverse of number_two.Hence : (result * number_two) mod number_one = 1 Name of source file: hexadecimal_big_number_test_for_primality.m. Function in the source file: hexadecimal_big_number_test_for_primality(number). The input to this function is an ODD number stored in hexadecimal format as a string. This function returns 1 if the input is a prime and returns -1 if input is composite. Name of source file: power_of_two_conversion_to_hexadecimal.m. Function in the source file: power_of_two_conversion_to_hexadecimal(power). The input is the number, the power to which two has to be raised to. It is a decimal number and the output is a hexadecimal number in form of string. For example, power_of_two_conversion_to_hexadecimal(4) returns ‘10’ i.e 16 in decimal system. Name of source file: hexadecimal_big_number_division.m. Function in the source file: hexadecimal_big_number_division (dividend, divisor). This function returns quotient and remainder both in hexadecimal string format. The inputs to this function are strings of hexadecimal format. This function uses other two functions in turn which are defined in source file Get_multiplier.m, multiplication_by_single_digit_multiplier.m. Name of source file: remove_leading_zeros.m. Function in the source file: remove_leading_zeros (number). This function takes number in hexadecimal string format as input and removes the leading zeros in the string and returns it. For example, if â€Å"Number = ‘000000012345’ â€Å", then the function returns ‘12345’. Some of the most prominent functions are presented in Appendix A. 4.3. Introduction to MD5 The MD5 Message-Digest Algorithm is a extensively utilised in cryptographic hash functions. Basically this is the case for cryptographic hash functions with a 128-bit (16-byte) hash value. MD5 is used in many security applications, and in addition it is frequently used to check data integrity. An MD5 hash is typically expressed as a 32-digit hexadecimal number. The following figure represents a schematic view of the MD5 Message-Digest Algorithm. 4.4. Implementation of MD5 This algorithm would compute MD5 hash function for files. For example, if as input is given the d = md5(FileName), then the function md5() will computes the MD5 hash function of the file specified in the string FileName. This function will returns it as a 64-character array dwhere d is the digest. The following methodology that the MD5 algorithm was implemented: Initially, the function Digestis called. This function would read the whole file, and will make it uint32 vector FileName = C:\md5InputFile.txt [Message,nBits] = readmessagefromfile(FileName); Then, it would append a bit in the last one that was read from that file: BytesInLastInt = mod(nBits,32)/8; if BytesInLastInt Message(end) = bitset(Message(end),BytesInLastInt*8+8); else Message = [Message; uint32(128)]; end Consequetly, it will append the zeros: nZeros = 16 mod(numel(Message)+2,16); Message = [Message; zeros(nZeros,1,uint32)]; And a bit length of the original message as uint64, such as the lower significant uint32 first: Lower32 = uint32(nBits); Upper32 = uint32(bitshift(uint64(nBits),-32)); Message = [Message; Lower32; Upper32]; The 64-element transformation array is: T = uint32(fix(4294967296*abs(sin(1:64)))); The 64-element array of number of bits for circular left shift: S = repmat([7 12 17 22; 5 9 14 20; 4 11 16 23; 6 10 15 21].,4,1); S = S(:).; Finally, the 64-element array of indices into X can be presented as: idxX = [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 6 11 0 5 10 15 4 9 14 3 8 13 2 7 12 5 8 11 14 1 4 7 10 13 0 3 6 9 12 15 2 0 7 14 5 12 3 10 1 8 15 6 13 4 11 2 9] + 1; The initial state of the buffer is consisting of A, B, C and D. such as: A = uint32(hex2dec(67452301)); B = uint32(hex2dec(efcdab89)); C = uint32(hex2dec(98badcfe)); D = uint32(hex2dec(10325476)); The message is reshaped, such as: Message = reshape(Message,16,[]); The look between the blocks, such that X is an extraction of the next block: for iBlock = 1:size(Message,2) X = Message(:,iBlock); The buffer states are stored as: AA = A; BB = B; CC = C; DD = D; The buffer is transformed by utilizing the X block from above, and the parameters from S, T and idxX k = 0; for iRound = 1:4 for q = 1:4 A = Fun(iRound,A,B,C,D,X(idxX(k+1)),S(k+1),T(k+1)); D = Fun(iRound,D,A,B,C,X(idxX(k+2)),S(k+2),T(k+2)); C = Fun(iRound,C,D,A,B,X(idxX(k+3)),S(k+3),T(k+3)); B = Fun(iRound,B,C,D,A,X(idxX(k+4)),S(k+4),T(k+4)); k = k + 4; end end The old buffer state is also being added: A = bitadd32(A,AA); B = bitadd32(B,BB); C = bitadd32(C,CC); D = bitadd32(D,DD); end The message digest is being formed the following way: Str = lower(dec2hex([A;B;C;D])); Str = Str(:,[7 8 5 6 3 4 1 2]).; Digest = Str(:).; The subsequent functionality is performed by the following operations: function y = Fun(iRound,a,b,c,d,x,s,t) switch iRound case 1 q = bitor(bitand(b,c),bitand(bitcmp(b),d)); case 2 q = bitor(bitand(b,d),bitand(c,bitcmp(d))); case 3 q = bitxor(bitxor(b,c),d); case 4 q = bitxor(c,bitor(b,bitcmp(d))); end y = bitadd32(b,rotateleft32(bitadd32(a,q,x,t),s)); And the bits are rotated such as: function y = rotateleft32(x,s) y = bitor(bitshift(x,s),bitshift(x,s-32)); The sum function is presented as: function sum = bitadd32(varargin) sum = varargin{1}; for k = 2:nargin add = varargin{k}; carry = bitand(sum,add); sum = bitxor(sum,add); for q = 1:32 shift = bitshift(carry,1); carry = bitand(shift,sum); sum = bitxor(shift,sum); end end A message is being read frm a file, such as: function [Message,nBits] = readmessagefromfile(FileName) [hFile,ErrMsg] = fopen(FileName,r); error(ErrMsg); Message = fread(hFile,inf,ubit32=>uint32); fclose(hFile); d = dir(FileName); nBits = d.bytes*8; Lastly, the auto test function is the following: function md5autotest disp(Running md5 autotest); Messages{1} = ; Messages{2} = a; Messages{3} = abc; Messages{4} = message digest; Messages{5} = abcdefghijklmnopqrstuvwxyz; Messages{6} = ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789; Messages{7} = char(128:255); CorrectDigests{1} = d41d8cd98f00b204e9800998ecf8427e; CorrectDigests{2} = 0cc175b9c0f1b6a831c399e269772661; CorrectDigests{3} = 900150983cd24fb0d6963f7d28e17f72; CorrectDigests{4} = f96b697d7cb7938d525a2f31aaf161d0; CorrectDigests{5} = c3fcd3d76192e4007dfb496cca67e13b; CorrectDigests{6} = d174ab98d277d9f5a5611c2c9f419d9f; CorrectDigests{7} = 16f404156c0500ac48efa2d3abc5fbcf; TmpFile = tempname; for k=1:numel(Messages) [h,ErrMsg] = fopen(TmpFile,w); error(ErrMsg); fwrite(h,Messages{k},char); fclose(h); Digest = md5(TmpFile); fprintf(%d: %sn,k,Digest); if ~strcmp(Digest,CorrectDigests{k}) error(md5 autotest failed on the following string: %s,Messages{k}); end end delete(TmpFile); disp(md5 autotest passed!); 4.4.1 Results This algorithm is tested with the input: university of Portsmouth department of electronic and computer engineering. This was written on the file: â€Å"C://md5InputFile.txt†. The outpus results are as in the following fugures: Textual description of the output results follows: OUTPUT FileName = C:\md5InputFile.txt Running md5 autotest FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 1: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 2: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 3: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 4: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 5: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 6: 3129b41fa9e7159c2a03ad8c161a7424 FileName = C:\md5InputFile.txt 1986621045 1769173605 1864399220 1867522150 1836282994 1752462703 1885692960 1836348001 544501349 1696622191 1952671084 1768845170 1851859043 1868767332 1953853549 1696625253 1852401518 1769104741 26478 7: 3129b41fa9e7159c2a03ad8c161a7424 md5 autotest passed! 4.5. Introduction to Caesar cipher The Caesar cipher in cryptography, is in essence a shift cipher. It represents as one of the simplest and most widely known encryption methodologies. The Caesar cipher is a kind of substitution cipher. It means that each letter in a given plaintext is replaced by another letter. This is done due shifting by some fixed number of positions down the alphabet. Julius Caesar was the first to use this ci
Tuesday, September 3, 2019
Organizational Development Essay -- Business, Team Intervention Model
Organizational Development (OD) has become more and more important for today’s organizations because the world is moving so fast that organizations have to find ways to be more effective, more innovation, more customer-driven, and more agile. Cumming and Worley (1997) define organizational development as â€Å"a process that applies a broad range of behavior science knowledge and practices to help organizations build their capacity to change and to achieve greater effectiveness†(p. 1). Therefore, OD will help organizations understand how people act to change and which change methods can work with the resistance to change that usually occurs in organizations undergoing change. As my concentration of SPS program is organizational development, it is important to study Organizational Intervention & Change Implementation in order to know how to operate and make use of change methods that seem to be vital in solving any problems that arise. What I First Learned about the Course In this course, I have learned that the change methods could be divided into four purposes: adaptable, planning, structuring, improving, and supportive (Holman, Devane, & Cady, 2007). In addition to the purpose, Holman, Devane, and Cady (2007) assert that individuals and organizations need to consider type of system, event size, duration, cycle, and practitioner preparation, and special resource needs. Since there are many methods to learn about, the paper of IIMT helped me to deeply understand methods that I thought they were interesting. I chose to study Appreciative Inquiry of adaptable methods, Scenario Thinking of planning methods, Participative Design Workshop of structuring methods, and The Six Sigma Approach of improving methods. In doing this assignment, ... ... experiences and information related with the issues. This was my first time to involve in fishbowl conversation and I found that it was an simple, effective technique to build trust and mutual understanding and to improve the relationship among members. Overall, the study of Organizational Intervention & Change Implementation through reading the book, attending the class, doing assignments such as IIMT and TIMPF, partaking in the process of organizational interventions, and having a fishbowl conversation help me to be very knowledgeable about change models, to effectively work in team, and to gain learning from classmates’ experiences and expertise. More importantly, I have gained ton of confidence in areas where I had little or no experience before. Now, I can have an ability to diagnose an organization’s problems and implement the appropriate change methods.
Thomas Jeff. Outline Essay -- essays research papers
                                                       Lenora Spahn                                                        9/22/00                     Thomas Jefferson I. Thomas Jefferson      A. Born- April 13, 1743 in Shadwell, Va.      B. Died- July 4, 1826 II. Background      A. Educational- College of William and Mary (1760-1762), 5 year apprenticeship           studying law under George Wythe.      B. Occupational-           1. Began to practice law on his own: representing small scale planters from           western countries involving land claims and titles.           2. House of Burgesses, elected 1768: Opposed all forms of Parliamentary                     taxation and supprted nonimportation resolutions against British trade                regulations.           3. Committee of Correspondence, 1773: Served as a makeshift Central                Government for colonies and advocated that colonies refuse to pay any duty           leveled by Parliament.           4. Virginia Convention in ... ...          through congress.      F. The Non-Intercourse Act, 1809: basically just a moderate version of the Embargo Act. X. Major Conflict      A. The major conflict was foreign trade and the trade embargoes and naval troubles that      the United States had with Britain and France caused the most influential decisions           Jefferson was forced to make. XI. Major Inventions and Technological Advancements      A. Fulton’s Steamboat,1807: Robert Fulton's side-paddled, steam-powered riverboat           made its first commercial voyage in Clermont.      B. In 1806, David Melville attempted the construction of gas street lighting in Rhode           Island. XII. Overall rating of the President      Thomas Jefferson is one of the most eagerly embraced Presidents in American history due not only to his Thomas Jeff. Outline Essay -- essays research papers                                                        Lenora Spahn                                                        9/22/00                     Thomas Jefferson I. Thomas Jefferson      A. Born- April 13, 1743 in Shadwell, Va.      B. Died- July 4, 1826 II. Background      A. Educational- College of William and Mary (1760-1762), 5 year apprenticeship           studying law under George Wythe.      B. Occupational-           1. Began to practice law on his own: representing small scale planters from           western countries involving land claims and titles.           2. House of Burgesses, elected 1768: Opposed all forms of Parliamentary                     taxation and supprted nonimportation resolutions against British trade                regulations.           3. Committee of Correspondence, 1773: Served as a makeshift Central                Government for colonies and advocated that colonies refuse to pay any duty           leveled by Parliament.           4. Virginia Convention in ... ...          through congress.      F. The Non-Intercourse Act, 1809: basically just a moderate version of the Embargo Act. X. Major Conflict      A. The major conflict was foreign trade and the trade embargoes and naval troubles that      the United States had with Britain and France caused the most influential decisions           Jefferson was forced to make. XI. Major Inventions and Technological Advancements      A. Fulton’s Steamboat,1807: Robert Fulton's side-paddled, steam-powered riverboat           made its first commercial voyage in Clermont.      B. In 1806, David Melville attempted the construction of gas street lighting in Rhode           Island. XII. Overall rating of the President      Thomas Jefferson is one of the most eagerly embraced Presidents in American history due not only to his
Monday, September 2, 2019
Globalization in Russia Essay
Globalization has done a lot to Russia not only in changing the economic parameters but also the social- cultural portfolio of life. Russia enjoys the sovereignty of a high state of integration within the community of the western world. The fight for high changes and maintenance of sovereignty is to maintain its high class phenomenon within its geographical neighborhood. The history of Russia is deeply founded on its Soviet country where the role of great leadership authorities reigned even across the national boundaries. In analyzing the globalization variable in Russia the role of women should not be over looked. As a general analysis however, the expectation of globalizations were not fully met. Long since the country went in such for globalization benefits, various rigidities have left it still lagging behind in the same aspects. Various economic downfalls and dissatisfaction have acted to compromise the adequate state of affairs in this state. (Brierley, 1) Broadly, females are greatly disadvantaged in this state full of political communism. From the UNICEF statistics, however, the women show a close difference with the male population. First the maternal mortality is as low as 32%. This is due to poor ante-natal care protection and poor attendant by skilled personnel during delivery. Only 96% of women are well attended by skilled persons at their delivery. The female mortality rate is around 7% which is a percentage almost equal to that of the male births. However, as the child ages 5 years, this ratio is considerably equal to that of the male children. Generally, Russia has a well proven medical care system. (Stoliaror, 43) Good medication systems make it vulnerable to deaths through ill-health compared to high percentage of the same in African and Asian countries. The female life expectancy has however showed a decreasing trend since 1970, with it being 72 years compared to 59 that of men. Either, the fertility rate in women is approximated to being 1. 4. Effect of globalization stretches its arms to the social autonomies were various social structures have radically changed to capture the changing effects in the national symmetry. At one level, marriage contraceptive prevalence is largely 34% with these varying between the literate and illiterate people. (Balcon, 27) High illiterates are vulnerable to low use of the same. Lower use of contraceptives has led to spread of various sexually transmitted diseases such as HIV whose total population is approximated to being 950,000. The ratio of marriage breakages between men and women is approximated to being 2 is to 3 (2:3) with two men for every three women. Either, teen marriage has been a social factor calling for various analytical consequences. Largely, 31% of the teen have showed in for marriage at their teen age. ( Robinson, 75) Out of this population 57% has been stated as being girls who even drop out of school above the consequences of early pregnancies. Such early marriages have been a big backbone of failed marriage coupled with inabilities to substantiate for family needs and requirements. The total fertility rate is however high as 1. 4. This has been precisely due to high standards of living and adequate medical attention. Education factor occupies a special place in studying the globalization and the social dispensation of Russia. However, the education statistics are high vulnerable and shows an equitable relationship between men and women (males and females). The ratio of adult literacy between men and women is almost equal and shows no much disparity. Statistic shows that, women through literacy have earned themselves a good place in the economic scenario where they have been voted as movers of wide range of governance activities. There is no discrimination between schooling for both sexes and every educational structure is modeled to provide equity and equality between men and women. Either, secondary school enrolment between males and females is equitable with a one to one ratio. The same attendance in the secondary school has also been found to been one is to one. High child education campaign and the good system of education providing equity for both sexes have ensured a high number of equal thresholds between males and females. The place for secondary school teaching has however favored females with the ratio being three is to two (60% for women). However, more men graduate for other occupations. Basically the university enrollment shows a small diversity with equal opportunity been provided for the both sexes. Generally, the level of literacy is subjectively equal with them sharing almost equally the various opportunities allied to education benefits. (Rozanora, 1) The female employment aspect is a critique issue in Russia. Various disparities between male and female employment draws various issues of concern. Broadly, the employment factor for females in Russia depend on critical issue of age, level of education and various social cultural autonomies. The general employment statistics in Russia are defined in terms of the level of professionalism. The major age bracket for women employment is between 20 and 55 years, though extremities below and above this fraction is evident. Any employment below 17 years is taken as child labor abuse. Either, some women population employment above 55 years is evident though few cases are available. Generally, the total women percentage is 43% of the total employment population in the country. Men are advantaged to get the better share of 57%. The female employment also shows a relatively equal ration between self-employed and professionals. Out of the total population of employed women, 54% are professional while the remaining ratio goes for self employment. However, men occupies the majority of the managerial position with around 2. 6% of the employed women population being managers (Fisher, 89) The wage and salary payment is depended on the professionalism and the level of position working for. Indeed, the general wage rate in Russia is substantially adequate which almost augers that of the United Nations and labor laws requirements. The existing state of Russia can be recommended of its high proficiency in factors of equity and equality in its structures. There is seldom equitable distribution of the natural resources between racial groups, sexes, social institutions and political structures. High political renaissance and motivation above the fight for sovereignty on individual rights has brought the absence or very minimal discrimination. (Taylor, 4) All the people founded on sexual disparities, religious orientations, educational indifferences and cultural autonomies above other parity orientations have enjoyed the fruits of equity and equality. The economic systems and structures are relatively distributed equally between the state groups. The political and legal processes have showered an equitable correspondence in providing support for everybody participation in the political interest. The legal system has ensured neutrality between the state groups in terms of education, cultural, religious and geographical orientations. Equity and equality also extends its arms to the marriage structures where a broad length in marriage regularities provides no discrimination to all. Neutrality in the states social structures provides adequate conditions with which people intermingle adequately with one another. (Smith, 47) Either, adequacy in people’s marriage has been provided with every person at his/her wish too choose marriage partner. At the marriage matrimony, equal rights between the couple have been founded on grounds of equity. Both the husband and the wife have equal role to play in the marriage activities. Ideally, globalization has done a lot in providing positive effects on health. The highly developed technology and research activity helps to provide high standards of medication. Generally, Russia is among the global states with high developments in health matters. However, globalization has yielded high standards in matter of health with high technology and medical attention been uncompromised. Health matters runs from household sanitation, drinking clean water, child immunization, malaria treatment, chronic disease treatments, HIV/AIDS statistics above others. (Duffy, 1) However, the general state of health is highly improved. As per the UNICEF statistics of 2006, Russian health variables have been characterized as among that of the developed countries which generally shows high states of health matters. However, HIV/AIDS campaign has below the hallmark of the health investigation, with 950000 million people been affected. Various health structures have been put into place to avoid its spread, through education on mother-child transmissions, use of sexual contraceptives and use of ARV’s above other medication pursuit for the affected people. Globally, Russia extends its arms even to other nations in providing health support. The country has various policies on population control and health support. (Passas, 1) Through its huge campaign it has set various health requirements and high standards for ensuring a controlled health population for its citizens. Various social-cultural inadequacies like literacy and political authorities have been in the fore front to shape the population growth and distribution. Russia defines various emigration policies and foreign citizen ownership. It has high controlled systems of monitoring migration exchange between its people and other nationals. Both emigration and immigration is captured at an outstanding perspective where various rules and regulations are never compromised in the acquisition of citizenry. Such policies streamline at one point to encourage or elsewhere to discourage immigration. This is based on the need for the observation of a high state of security. Any migration policy is also aimed at ensuring possible inadequacies which may have effect on the existing state resources. This is in the recognition of highly/excessive pressure of immigration and unexploited resources on high emigrations. Migration policies stretch its arms on refugees, where various laws have been put to cater for any refugee. They also observe the United Nations standards on their treatment to refugees. The neutrality in terms of laws has provided a high comprehensive observation of human rights. The United Nations Development Program has shown an explicitly adequate standard on the observation of human rights. The state legal process has a profound structure in which it elaborates the process system of the law and regulations defining human rights and freedoms. Either, it has been vulnerable in observing various rights allied to refugees as per the UNHCR regulations. The political system and the court autonomy have ensured a high implication in support for states which provide rationality in ensuring observation of people’s rights and freedoms. Summarily therefore, globalization has done a lot in shaping and determining the state of social structures in Russia. It various influences have helped to foster an improved state of living for both men women. Work cited Balcon, D. Solidarity without Pay in Russia. The Nation, vol. 266, April 27 1998. Brierley, N. Russia: Perceptions and Reality. a Round T able Discussion 13 February 2003 New Statesman, vol. 132, April 7,2003. Duffy, D. An assessment of Health Policy Reform in Russia. Policy Studies Journal, Vol. 25.
Sunday, September 1, 2019
Advanced When Live in Big Cities
ADVANCED WHEN LIVE IN BIG CITIES Big cities are often more exciting and they also have a quicker pace. Living in large cities means that you have to become more active so that you can adapt to a variety of situations. Another aspect of the exciting of city life is the variety of cultural activities available. Big cities are cultural centers where there are social activies, sports events, concerts, trade shows, fashion shows, ect†¦In big cities, there are a lot of places for you to relax at weekends and go on vacatons such as theatres, cinemas, parks and zoos, and centers of recreation. Big cities are aslo economical centers with a lot of big companies, both national and international. It means that you have many chances to get a good job. These are rare in small towns or the countryside. In addition, there are many facilities for our life and health care. For example, you can find plenty of shops and supermarkets around places where you are living.Therefore, you can buy everyday neccessities quickly. Furthermore, people concern more about their health and safety than other things in their lifes. In big cities, medical facilities and emergency services are easily accessibe than in the countryside. Big cities also have convinient transportation and utility systems. They also offer faster internet connections. These all make our life easier. To summazire, I think that living in big cities is much better than living in the countryside because of advanced facilities and social activities.
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