The Truman Doctrine and the Cold War Essay Example | Topics and Well Written Essays - 2500 words

The Truman Doctrine and the Cold War - Essay Example 346). It was in this time that the United Nations was formed, because the world was even more conflict-weary than it had been after the Great War, when Woodrow Wilson sought to create a League of Nations that would stop major disputes before they ever again became worldwide wars. However, even as workers were still picking up the rubble from the damage in Europe and Asia, the seeds of a new war between the United States and the Soviet Union, two erstwhile allies, were being planted: the Cold War. This was not a war that could ever really begin on a battlefield, because both of the combatants possessed the tactical ability to destroy the planet with nuclear bombs. And so, in many instances, the Cold War became a game to see how much one side would put up with from the other. Perhaps the most volatile moments of the Cold War occurred during the Presidency of John F. Kennedy, when the Soviet Union installed missiles on the island of Cuba, mere miles away from United States soil. The fifteen days of that crisis were as close as the two sides ever came to actual nuclear holocaust. The beginnings of this Cold War, in some ways, may be said to lie at the feet of the United States government. Even during World War II, the United States and Great Britain refused to let the Soviets join the project to create atomic weapons, which led Stalin to mistrust the other two Allies. At the end of the war, the United States stopped sending lend-lease aid far earlier than the Soviets liked, and refused to lend the Soviet government $6 billion for reconstruction, while at the same time lending Great Britain $3.75 billion for similar costs (Pollard, p. 27). The two sides also differed on the postwar fate of Eastern Europe: the Soviet Union, having been invaded twice in thirty years by German armies, wanted to create a buffer zone protecting it from further western invasions, and so it quickly cemented control over most of Eastern Europe, including the Soviet occupation zone of Germany. The Americans, in contrast, supported the Wilsonian idea of an "open world" filled with auto nomous, democratic nations. The Soviet grab for Eastern Europe immediately after World War II ended deeply offended American sensibilities (Bailey and Kennedy, p. 822). Stalin was in no way innocent in the beginnings of the Cold War. In 1946, he broke an agreement to remove Soviet troops from northern Iran. In early 1947, when Great Britain told the United States it could no longer assist the Greek government in keeping stability, and when the Turkish government seemed vulnerable to internal agitation, President Truman decided that a containment policy toward the Soviet Union would be best. In a speech to Congress on March 12, 1947, he asked for $400 million in aid to Greece and Turkey, to help keep their governments from collapsing, and to keep Communist influence from overtaking those two countries. In this speech, Truman hearkened back to World War II for support: One of the primary objectives of the foreign policy of the United States is the creation of conditions in which we and other nations will be able to work out a way of life free from coercion. This was a

Cover letter (business letter format or block style) Essay - 1

Cover letter (business letter format or block style) - Essay Example Besides that, my tutor advised me to look for additional help through the reading and writing centers. Following this class, I can now review the overall effort that I have put throughout the learning period. I learnt the most from analyzing a friend’s essay entitled, â€Å"Food Stamp and Millions People Rely on† in several ways. Since it was my first time to encounter this type of an essay, I had to undertake significant research on the topic and post my work in the class forum. However, I made several mistakes such as providing personal opinion instead of analyzing the content. In addition, my mind opened up when we were learning about ethos, pathos and logos as I am now able to identify different types of appeals and understand an article’s deeper meaning. One of my easiest essays was â€Å"Forgiveness and Generosity†. The main reason why I found the essay easy was the fact that it was a reflective essay where I had the permission to give my experiences, which is one of the easiest things for me to do. This is because most of the information incorporated my own life events and it is considerably easy for me to remember it. In addition, I did not have to apply many writing skills. One of the essays that I struggled most to complete was titled, â€Å"Effects of Tsunami on Japan’s Economy†. I was not conversant with citations but my instructor showed me how to use a simplified website that generates automatic citations easily. I still made the mistake of not arranging the citations in alphabetical order. I had to read very many sources, which was tedious. I had difficulties when writing the outline and my essay had many grammatical mistakes. However, my tutor rendered her assistance on how to fix most mistakes and my final draft had improved substantially as there were fewer mistakes. Through reading many articles, I was able to learn many words that I can now apply easily in my essays. I also learnt several writing

Asserting Ethnic Identity and Power Through Language Essay Example for Free

Asserting Ethnic Identity and Power Through Language Essay Week-1 The linguistic ideology at work here is founded both on the concept of the ‘mother tongue’ as well as on the ‘one nation, one language’ principle. Communities on the western side of the border are not interested in learning the language of their eastern neighbors. Eastern communities, on the other hand, are strongly motivated to learn western languages. The importance attributed to English as the ‘language of globalization’ is common to both sides. We can actually say that ‘language’ is a very hot and recurrent issue for some communities: namely the German-speaking community in Bernstein (D), the Czech-speaking community in Vejprty (CS), the German-speaking and Slovenian-speaking communities in Eisenkappel/Z? elezna Kapla (A),etc. The term ‘mother tongue’ is often used – forms the ‘way of thinking’ of its speakers, and thus the different ‘mentalities’ and ‘national characters’ are connected with the use of different languages. Many informants are convinced that it is the ‘mother tongue’ which determines thought, social behavior, and exhibition or control of affection and emotions. Thus the confrontation between languages automatically becomes a clash of mentalities. For example, the German-speaking community in Ba? renstein finds there is a relation between the insurmountable difficulty in pronouncing and learning the Czech language and the incomprehensibility of the words Czech-speaking people produce. People in western communities explain this widespread knowledge by saying that ‘the Others’ need to know my language, because my language is the superior One. We can also find indices of implicit prestige in many interview quotes, like ‘my language is useful to find a job’, ‘my language is more international than theirs’, ‘it represents a symbol of upward social mobility’; ‘the importance of my language forces them to learn it, and in this way they show practical sense, intelligence and cleverness, because they well know that the knowledge of the languages spoken on both sides of the border offers more professional and economic opportunities’. People are not generally interested in learning the language of the ‘Other’, and the reason is, as we have already seen, its ‘uselessness’, or its low value on the ‘language market’. They only learn what they need in their commercial transactions. Europe is a multilingual continent in which the tension between linguistic pluralism and assimilation is quite evident at present. Week-2 The topic for this week was â€Å"Creation of a Sense of Belonging through Language†, which we found very much interesting as we have to present our own explanation, views and thoughts. The topic is about Finland, Iceland and Latvia. Firstly we discussed about Finland that Swedish-speaking people along the coastlines, spoke a non-Scandinavian language, namely Finnish. The Finnish language was to become the most effective medium in the nation-building process as well as the most important criterion in creating an awareness of a collective identity. Language became a defining characteristic towards the ‘outside’ and a communicative driving force on the ‘inside’ within the great diversity of local and regional cultures. We could say that for the process of nation-building in Finland during the 19th century two main deficits had to be overcome: sovereign state structures had to be developed and an individual Finnish national consciousness had to be formed. In the process of spreading a Finnish national consciousness – a development often associated with the term ‘awakening’ as in a religious experience – the main focus was directed towards the common people, their language and culture. Finland’s modest cultural life, Finnish had gained the status of a modern cultural and scientific language. The civil servants, scholars, and many artists, continued to use Swedish as their language of communication and publication. But Finnish steadily gained ground. Many people were already, or became, bilingual. The accusation that Finnish was ‘too primitive’ was defeated by generating new terms, which proved that the language was innovative and possessed the potential for development. In the discussion about Iceland by Halfdanarson. The text tells a story of Icelandic nationalism and the struggle for independence of Iceland under Danish rule. Halfdanarson points out the rare case of Icelandic nationalism, and its non-violent nature. In fact, according to the article, both Iceland’s struggle for independence and the Danish reactions to it were both surprisingly pacific in nature, partly because of the idea of shared past and cultural heritage between the two countries. There are certain elements in common with the case study of Iceland and Herders text, such as the idea of mystic, shared past of a nation, the role of the single language of a social group forming the nation and so on. I think especially in cases like Iceland, language and linguistic identity have essential role in formation of national identity. Iceland is isolated, both in geographical terms as an island in the middle of Atlantic ocean and in terms of language. Although Icelandic is a language related to scandinavian languages, it still differes from them quite a lot. And lastly There was a question that is it possible to have a single language in whole Europe? We think its not possible to have a single langage in the whole Europe as there are many different countries with their own languages from last hundreds of years. In Europe, People communicate with each other using the shared language of their group. The group might be as small as a couple (married or unmarried partners, twins, mother and daughter etc. who share a ‘private’ language where only they know the meaning of some words) or as large as a nation, where everyone understands the allusions in their shared language (often allusions to shared history, to contemporary events, to media people of fact or fiction etc). The ‘secret’ language of the smallest group and the ‘public’ language of the national group are two ‘varieties’ of the same language. Every social group, large or small, has its own language variety, (regional groups have varieties of the national language (as opposed to regional or minority languages) which are usually called ‘dialects’) and there is overlap among all the varieties. However there is a possibility to use English as a second language as use of English gives a considerable advantage to the 13 % of EU citizens who are native English speakers, and to speakers of closely related languages (German, Dutch, Danish and Swedish), over all other Europeans. Week-3 In the week 3, we learned about ‘Language and subjective identity’. The two articles were on Franz Kafka and Simone de Beauvoir. Franz Kafka was German though he never lived among the Germans. He was then living in Prague, Czech. Hence Kafka knew both Czech German languages. But, he preferred Czech Language as he was of the view that one could express his/her feeling in a better way in a particular language. In this case, he thought that Czech was a better language than German to express his feelings. Franz Kafka was in love with Czech translator Milena Jesenka. He used to demand Milena to write him letters in Czech language than German. He belived in a approach belongs to a language. When Milena replied his letters in Czech, he believed that Czech was much more affectionate, which removes all the uncertainties, he could see his lover more clearly, the movements of her body, her hands quickly which almost resembled as they both are meeting. This shows how Kafka prefered Czech more than German. Kafka encouraged his favourite sister Ottla in her marriage to Josef David, a Czech Catholic, against the opposition of parents and relatives, and wrote affectionately to his new brother-in-law in fluent Czech. For Prague Jews of Kafkas generation, language and identity could be painfully dissonant. In Kafkas case, this dissonance reached deep into his own family, conferring an alien quality on the most intimate of human relationships. Franz Kafka died of tuberculosis in 1924. He is buried beside his parents in the family plot in Pragues New Jewish Cemetery. Simone de Beauvoir is a French Women. She was French writer, political activist, feminist, and social theorist. She gave her whole life for feminine rights and equality with men in Society. Beauvoir was an outstanding student. She did her postgraduate work at the Ecole Normale Superieure, the top postgraduate program in France, where she met Jean Paul Sartre. When World War II broke out in September 1939, Sartre was called for military service. He became a prisoner of war when the French army surrendered, but he was released and both Beauvoir and Sartre participated in the resistance, and after the Vichy Regime dismissed Beauvoir from her teaching position, she began a novel about the resistance. When the war ended, Beauvoir and Sartre became part of a group of leading French intellectuals, who concerned themselves with the perceived failures of modern French society. they founded Les Temps modernes as a means to explain their social and cultural views. At the same time, Sartre suggested to Beauvoir that she undertake a book on the status of women, and she published, La deuxieme sexe (The Second Sex). This was her most famous, and influential book. It became a sourcebook of modern feminism, particularly in the United States for later feminist thinkers such as Betty Friedan and Gloria Steinem. De Beauvoir used very specific and effective and powerful words to underline her matter. She is willing to deploy language and words towards others, because she knows about â€Å"a manner in which her body and her relation to the world are modified through the action of others than herself†.

Database security and encryption

Database security and encryption Introduction Organisations are increasingly relying on the distributed information systems to gain productivity and efficiency advantages, but at the same time are becoming more vulnerable to security threats. Database systems are an integral component of this distributed information system and hold all the data which enables the whole system to work. A database can be defined as a shared collection of logically related data and a description of this data, designed to meet the information needs of an organization. A database system is considered as a collection of related data, database management system (DBMS) a software that manages (define, create and maintain) and controls the access to the database, and a collection of database application(s) a program that interacts with the database at some point in its execution (typical example is a SQL statement) along with the DBMS and the database itself [1]. Organisations have adopted database systems as the key data management technology for decision-making and day-to-day operations. Databases are designed to hold large amounts of data and management of data involves both defining structures for storage of information and providing mechanisms for manipulation of information. As the data is to be shared among several users the system must avoid anomalous results and ensure the safety of the information stored despite system crashes and attempts at unauthorized access. The data involved here can be highly sensitive or confidential, thus making the security of the data managed by these systems even more crucial as any security breach does not affect only a single application or user but can have disastrous consequences on the entire organisation. A number of security techniques have been suggested over the period of time to tackle the security issues. These can be classified as access control, inference control, flow control, and encryptio n. 1.1 A Short History Starting from the day one when database applications were build using hierarchical and network systems to todays date when we have so many different database systems like relational databases (RDBMS), object-oriented databases (OODBMS), object-relational databases (ORDBMS), eXtended Query (XQUERY); one factor which was, is, and will be of the utmost importance is the security of the data involved. Data always has been a valuable asset for companies and must be protected. Organizations spend millions these days in order to achieve the best security standards for the DBMS. Most of an organizations sensitive and proprietary data resides in a DBMS, thus the security of the DBMS is a primary concern. When we talk of securing a DBMS, this is with respect to both the internal and the external users. The internal users are the organization employees like database administrators, application developers, and end users who just use the application interface, which fetch its data from one of the databases and the external users can be the employees who do not have access to the database or an outsider who has nothing to do with the organization. The other factors which has made data security more crucial is the recent rapid growth of the web based information systems and applications and the concept of mobile databases. Any intentional or accidental event that can adversely affect a database system is considered as a threat to database and database security can be defined as a mechanism that protects the database against such intentional or accidental threats. Security breaches can be classified as unauthorized data observation, incorrect data modification, and data unavailability, which can lead to loss of confidentiality, availability, integrity, privacy, and theft and fraud. Unauthorized data observation results in disclosure of information to users who might not be entitled to have access to such kind of information. Incorrect data modification intentional or unintentional leaves the database in an incorrect state. Data can hamper the functionality of an entire organization in a proper way if not available when needed. Thus the security in terms of databases can be broadly classified into access security and internal security. Access security refers to the mechanisms implemented to restrict any sort of unauthorized access to the database; examples can be authorization methods such as every user has a unique username and password to establish him as a legitimate user when trying to connect to the database. When the user tries to connect to the database the login credentials will be checked against a set of usernames and password combinations setup under a security rule by a security administrator. Internal security can be referred to as an extra level of security, which comes into picture if someone has already breached the access security such as getting hold of a valid username and password, which can help getting access to the database. So the security mechanism implemented within the database such as encrypting the data inside the database can be classed as internal security, which prevents the data to be compromised even if someone has got unauthorized access to the database. Every organization needs to identify the threats they might be subjected to and the subsequently appropriate security plans and countermeasures should be taken, taking into consideration their implementation costs and effects on performance. Addressing these threats helps the enterprise to meet the compliance and risk mitigation requirements of the most regulated industries in the world. 1.2 How Databases are Vulnerable According to David Knox [2], Securing the Database may be the single biggest action an organization can take, to protect its assets. Most commonly used database in an enterprise organization is relational database. Data is a valuable resource in an enterprise organization. Therefore they have a very strong need of strictly controlling and managing it. As discussed earlier it is the responsibility of the DBMS to make sure that the data is kept secure and confidential as it the element which controls the access to the database. Enterprise database infrastructure is subject to an overwhelming range of threats most of the times. The most common threats which an Enterprise Database is exposed to are: Excessive Privilege Abuse when a user or an application has been granted database access privileges which exceeds the requirements of their job functions. For example an academic institute employee whose job only requires only the ability to change the contact information for a student can also change the grades for the student. Legitimate Privilege Abuse legitimate database access privileges can also be abused for malicious purposes. We have two risks to consider in this situation. The first one is confidential/sensitive information can be copied using the legitimate database access privilege and then sold for money. The second one and perhaps the more common is retrieving and storing large amounts of information on client machine for no malicious reason, but when the data is available on an endpoint machine rather than the database itself, it is more susceptible to Trojans, laptop theft, etc. Privilege Elevation software vulnerabilities which can be found in stored procedures, built-in functions, protocol implementations or even SQL statements. For example, a software developer can gain the database administrative privileges by exploiting the vulnerabilities in a built-in function. Database Platform Vulnerabilities any additional services or the operating system installed on the database server can lead to an authorized access, data corruption, or denial of service. For example the Blaster Worm which took advantage of vulnerability in Windows 2000 to create denial of service. SQL Injection the most common attack technique. In a SQL injection attack, the attacker typically inserts unauthorized queries into the database using the vulnerable web application input forms and they get executed with the privileges of the application. This can be done in the internal applications or the stored procedures by internal users. Access to entire database can be gained using SQL injection Weak Audit a strong database audit is essential in an enterprise organization as it helps them to fulfill the government regulatory requirements, provides investigators with forensics link intruders to a crime deterring the attackers. Database Audit is considered as the last line of database defense. Audit data can identify the existence of a violation after the fact and can be used to link it to a particular user and repair the system in case corruption or a denial of service attack has occurred. The main reasons for a weak audit are: it degrades the performance by consuming the CPU and disk resources, administrators can turn off audit to hide an attack, organizations with mixed database environments cannot have a uniform, scalable audit process over the enterprise as the audit processes are unique to database server platform Denial of Service access to network applications or data is denied to the intended users. A simple example can be crashing a database server by exploiting vulnerability in the database platform. Other common denial of service techniques are data corruption, network flooding, server resource overload (common in database environments). Database Protocol Vulnerabilities SQL Slammer worm took advantage of a flaw in the Microsoft SQL Server protocol to force denial of service conditions. It affected 75,000 victims just over 30 minutes dramatically slowing down general internet traffic. [Analysis of BGP Update Surge during Slammer Worm Attack] Weak Authentication obtaining legitimate login credentials by improper way contributes to weak authentication schemes. The attackers can gain access to a legitimate users login details by various ways: by repeatedly entering the username/password combination until he finds the one which works (common or weak passwords can be guessed easily), by convincing someone to share their login credentials, by stealing the login credentials by copying the password files or notes. Backup Data Exposure there are several cases of security breaches involving theft of database backup tapes and hard disks as this media is thought of as least prone to attack and is often completely unprotected form attack [3]. All these security threats can be accounted for unauthorized data observation, incorrect data modification and data unavailability. A complete data security solution must take into consideration the secrecy/confidentiality, integrity and availability of data. Secrecy or confidentiality refers to the protection of data against unauthorized disclosure, integrity refers to prevention of incorrect data modification and availability refers to prevention of hardware/software errors and malicious data access denials making the database unavailable. 1.3 Security Techniques As organizations increase their adoption of database systems as the key data management technology for day-to-day operations and decision-making, the security of data managed by these systems has become crucial. Damage and misuse of data affect not only a single user or application, but may have disastrous consequences on the entire organization. There are four main control measures which can be used to provide security of data in databases. These are: Access Control Inference Control Flow Control Data Encryption Chapter 2 Literature Review Secure and secret means of communication has been always desired for in the field of database systems. There is always a possibility of interception by a party outside of the sender-receiver domain when data is transmitted. Modern digital-based encryption methods form the basis of todays world database security. Encryption in its earlier days was used by military and government organizations to facilitate secret information but in present times it is used for protecting information within many kinds of civilian systems. In 2007 the U.S. government reported that 71% of companies surveyed utilized encryption or some of their data in transit [4]. 2.1 Encryption Encryption is defined as the process of transforming information (plaintext) using an encryption algorithm (cipher) into unreadable form (encrypted information called as ciphertext) making it inaccessible to anyone without possessing special knowledge to decrypt the information. The encoding of the data by a special algorithm that renders the data unreadable by any program without the decryption key, is called encryption [1]. The code and cipher are the two methods of encrypting data. The encryption of data or a message is accomplished by one, or both, of the methods of encoding or enciphering. Each involves distinct methodologies and the two are differentiated by the level at which they are carried out. Encoding is performed at the word or block level and deals with the manipulation of groups of characters. Enciphering works at the character level. This includes scrambling individual characters in a message, referred to as transposition, and substitution, or replacing characters with others. Codes generally are designed to replace entire words or blocks of data in a message with other words or blocks of data. Languages can be considered codes, since words and phrases represent ideas, objects, and actions. There are codes that substitute entire phrases or groups of numbers or symbols with others. A single system may employ both levels of encoding. For example, consider a code encryption scheme as follows: the = jam, man = barn, is = fly, dangerous = rest. Then the message, the man is dangerous, would read in encrypted form, jam barn fly rest. Although overly-simplistic, this example illustrates the basis of codes. With the advent of electrical-based communications, codes became more sophisticated in answer to the needs of the systems. For example, the inventions of Morse code and the telegraph dictated a need for secure transmission that was more sophisticated. Codes are very susceptible to breaking and possess a large exposure surface with regard to interception and decryption via analysis. Also, there are no easily-implemented means by which to detect breaches in the system. The other method of encryption is the cipher. Instead of replacing words or blocks of numbers or symbols with others, as does the code, the cipher replaces individual or smaller sets of letters, numbers, or characters with others, based on a certain algorithm and key. Digital data and information, including vi deo, audio, and text, can be separated into groups, or blocks, of bits, and then manipulated for encryption by such methods as XOR (exclusive OR), encoding-decoding, and rotation. As an example, let us examine the basics of the XOR method. Here, a group of bits (e.g., a byte) of the data is compared to a digital key, and the exclusive-or operation is performed on the two to produce an encrypted result. Figure 2 illustrates the process. Figure 2: The XOR process for Encryption When the exclusive-or operation is performed on the plaintext and key, the ciphertext emerges and is sent. The receiver performs the exclusive-or operation on the ciphertext and the same key, and the original plaintext is reproduced [5]. Encryption can be reversible and irreversible. Irreversible techniques do not allow the encrypted data to be decrypted, but at the same time the encrypted data can be used to obtain valid statistical information. Irreversible techniques are rarely used as compared to the reversible ones. The whole process of transmitting data securely over an insecure network system is called as cryptosystem that includes à » An encryption key to encrypt the data (plaintext) à » An encryption algorithm that transforms the plaintext into encrypted information (ciphertext) with the encryption key à » A decryption key to decrypt the ciphertext à » A decryption algorithm that transforms the ciphertext back into plaintext using the decryption key [1]. 2.2 Encryption Techniques The goals in digital encryption are no different than those of historical encryption schemes. The difference is found in the methods, not the objectives. Secrecy of the message and keys are of paramount importance in any system, whether they are on parchment paper or in an electronic or optical format [5]. Various encryption techniques are available and broadly can be classified into two categories; asymmetric and symmetric encryption. In symmetric encryption the sender and receiver share the same algorithm and key for encryption and decryption and depends on safe communication network for encryption key exchange whereas in asymmetric encryption uses different keys for encryption and decryption. Asymmetric encryption gave birth to the concept of public and private keys and is preferred to symmetric encryption being more secure [1], [5]. 2.2.1 Symmetric Encryption Symmetric encryption also known as single-key encryption or conventional encryption was the only encryption and by far the most widely used of the two types before the concept of public-key encryption came into picture. The figure below illustrates the symmetric encryption process. The original message (plaintext) is converted into apparently random information (ciphertext) using an algorithm and a key. The key is a value independent of the plaintext. The algorithm produces different outputs for specific keys used at the time i.e. the output of the algorithm changes if the key is changed. The ciphertext produced is then transmitted and is transformed back to the original plaintext by using a decryption algorithm and the same key that was used for encryption. Figure: Simplified Model of Conventional Encryption [7 page 22] The model can be better understood by the following example. A source produces a message X = [X1, X2, X3 à ¢Ã¢â€š ¬Ã‚ ¦XM] in plaintext. The M elements of X are letters in some finite alphabet. The alphabet usually consisted of 26 capital letters traditionally but nowadays; binary alphabet {0,1} is used. An encryption key K = [K1, K2, K3 à ¢Ã¢â€š ¬Ã‚ ¦.KJ] is generated and is shared between the sender and the receiver using a secure channel. Also a third party can generate the encryption key and securely deliver it to both the sender and the receiver. Using the plaintext X and the encryption key K as input, the encryption algorithm produces the ciphertext Y = [Y1, Y2, Y3 à ¢Ã¢â€š ¬Ã‚ ¦.YN] as Y = EK(X) where E is the encryption algorithm and the ciphertext Y is produced as the function of the plaintext X using E. At the receivers end the ciphertext is converted back to the plaintext as X = DK(Y) where D is the decryption algorithm. Figure: Model of Conventional Cryptosystem [7 page 23] The common symmetric block ciphers are Data Encryption Standard (DES), Triple DES, and Advanced Encryption Standard (AES) 2.2.1.1 The Data Encryption Standard Data Encryption Standard has been used in the most widely used encryption schemes including Kerberos 4.0. The National Bureau of Standards adopted it as a standard in 1977 [7]. DES operates on 64-bit blocks using a 56-bit key. Like other encryption schemes, in DES there are two inputs to the encryption function, the plaintext to be encrypted and the key. The plaintext should be of 64 bits in length and the key length is 56 bits obtained by stripping off the 8 parity bits, ignoring every eighth bit from the given 64-bit key. The output from the algorithm after 16 rounds of identical operations is the 64-bit block of ciphertext. A suitable combination of permutations and combinations (16 times) on the plaintext is the basic building block of the DES. Same algorithm is used for both encryption and decryption except for processing the key schedule in the reverse order [6], [7]. The 64-bit plaintext is passed through an initial permutation (IP) that produces a permuted input by rearranging the bits. This is followed by16 rounds of the same function, which involves both permutation and substitution functions. The last round results in the output consisting of 64-bits that are a function of the input plaintext and the key. The left and the right halves of the output are swapped to produce the preoutput. The preoutput is passed through a final permutation (IP-1), an inverse of the initial permutation function to achieve the 64-bit ciphertext. The overall process for DES is explained in the diagram below Figure: General Depiction of DES Encryption Algorithm [7 page 67] The right hand side of the diagram explains how the 56-bit key is used during the process. The key is passed through a permutation function initially and then for each of the 16 rounds a subkey (Ki) is generated, by combining left circular shift and a permutation. For every round the permutation function is same, but the subkey is different because of the repeated iteration of the key bits. Since the adoption of DES as a standard, there have always been concerns about the level of security provided by it. The two areas of concern in DES are the key length and that the design criteria for the internal structure of the DES, the S-boxes, were classified. The issue with the key length was, it was reduced to 56 bits from 128 bits as in the LUCIFER algorithm [add a new reference], which was the base for DES and everyone suspected that this is an enormous decrease making it too short to withstand brute-force attacks. Also the user could not be made sure of any weak points in the internal structure of DES that would allow NSA to decipher the messages without the benefit of the key. The recent work on differential cryptanalysis and subsequent events indicated that the internal structure of DES is very strong. 2.2.1.2 Triple DES Triple DES was developed as an alternative to the potential vulnerability of the standard DES to a brute-force attack. It became very popular in Internet-based applications. Triple DES uses multiple encryptions with DES and multiple keys as shown in the figure [below]. Triple DES with two keys is relatively preferred to DES but Triple DES with three keys is preferred overall. The plaintext P is encrypted with the first key K1, then decrypted with the second key K2 and then finally encrypted again with the third key K3.According to the figure the ciphertext C is produced as C = EK3[DK2[EK1[P]]] These keys need to be applied in the reverse order while decrypting. The ciphertext c is decrypted with the third key K3 first, then encrypted with the second key K2, and then finally decrypted again with the first key K1; also called as Encrypt-Decrypt-Encrypt (EDE) mode, producing the plaintext P as P = DK1[EK2[DK3[C]]] Figure: Triple DES encryption/decryption [6 page 72] 2.2.1.3 Advanced Encryption Standard 2.3 Encryption in Database Security Organizations are increasingly relying on, possibly distributed, information systems for daily business; hence they become more vulnerable to security breaches even as they gain productivity and efficiency advantages. Database security has gained a substantial importance over the period of time. Database security has always been about protecting the data data in the form of customer information, intellectual property, financial assets, commercial transactions, and any number of other records that are retained, managed and used on the systems. The confidentiality and integrity of this data needs to be protected as it is converted into information and knowledge within the enterprise. Core enterprise data is stored in relational databases and then offered up via applications to users. These databases typically store the most valuable information assets of an enterprise and are under constant threat, not only from the external users but also from the legitimate users such as trusted ins iders, super users, consultants and partners or perhaps their unprotected user accounts that compromise the system and take or modify the data for some inappropriate purpose. To begin with, classifying the types of information in the database and the security needs associated with them is the first and important step. As databases are used in a multitude of ways, it is useful to have some of the primary functions characterized in order to understand the different security requirements. A number of security techniques have been developed and are being developed for database security, encryption being one of them. Encryption is defined as the process of transforming information (plaintext) using an encryption algorithm (cipher) into unreadable form (encrypted information called as ciphertext) making it inaccessible to anyone without possessing special knowledge to decrypt the information. The encoding of the data by a special algorithm that renders the data unreadable by any program without the decryption key, is called encryption [1]. 2.3.1 Access Encryption There are multiple reasons for access control to confidential information in enterprise computing environments being challenging. Few of them are: First, the number of information services in an enterprise computing environment is huge which makes the management of access rights essential. Second, a client might not know which access rights are necessary in order to be granted access to the requested information before requesting access. Third, flexible access rights including context-sensitive constraints must be supported by access control Access control schemes can be broadly classified in two types: proof-based and encryption-based access control schemes. In a proof-based scheme, a client needs to assemble some access rights in a proof of access, which demonstrates to a service that the client is authorized to access the requested information. Proof-based access control is preferred to be used for scenarios where client specific access rights required are flexible. It becomes easy to include support for constraints if the access rights are flexible. However, it is not the same case for covert access requirements. According to the existing designs, it is assumed that a service can inform a client of the nature of the required proof of access. The service does not need to locate the required access rights, which can be an expensive task, in proof-based access control scheme. [9] In an encryption-based access-control scheme, confidential information is provided to any client in an encrypted form by the service. Clients who are authorized to access the information have the corresponding decryption key. Encryption-based access-control scheme is attractive for scenarios where there are lots of queries to a service shielding the service from having to run client-specific access control. As compared to proof-based access control it is straightforward to add support for covert access requirements to existing encryption-based architectures. In particular, all the information is encrypted by the service as usual, but the client is not told about the corresponding decryption key to use. The client has a set of decryption keys, the client now needs to search this set for a matching key. On the other hand, considering that key management should remain simple, it is less straightforward to add support for constraints on access rights to the proposed architectures. [10] 2.3.1.1 Encryption-Based Access Control Encryption-based access control is attractive, in case there are lots of requests for the same information, as it is independent of the individual clients issuing these requests. For example, an information item can be encrypted once and the service can use the ciphertext for answering multiple requests. However, dealing with constraints on access rights and with granularity aware access rights becomes difficult with the uniform treatment of requests. Further challenges are presented in cases of covert access requirements and service-independent access rights. The main requirements for encryption based access control are: à » Any knowledge about the used encryption key or the required decryption key must not be revealed by the encrypted information. à » For decrypting encrypted information, each value of a constraint must require a separate key that should be accessible only under the given constraint/value combination and we want a scheme that supports hierarchical constraints to make key management simple. à » The decryption key for coarse-grained information should be derivable from the key for fine-grained information to further simplify key management. à » A single decryption key will be used to decrypt the same information offered by multiple services as implied by the service-independent access rights. Because of this, same information can be accessed by a service encrypting information offered by other services in a symmetric cryptosystem. This problem can be avoided by using asymmetric cryptosystem. [8] 2.3.1.2 Encryption-Based Access Control Techniques An access-control architecture will be an ideal one if the access rights are simple to manage; the system is constrainable and is aware of granularity. The architecture also has to be asymmetric, provide indistinguishability, and be personalizable in the case of proof-based access control. Some common encryption-based access control techniques are: Identity Based Encryption An identity-based encryption scheme is specified by four randomized algorithms: à » Setup: takes a security parameter k and returns system parameters and master-key. The system parameters include a description of a finite message space m and a description of a finite ciphertext space c. Intuitively, the system parameters will be publicly known, while the master-key will be known only to the Private Key Generator (PKG). à » Extract: takes as input system parameters, master-key, and an arbitrary ID à Ã‚ µ {0,1}*, and returns a private key d. ID is an arbitrary string which is then used as a public key, and d is the corresponding private decryption key. The Extract algorithm extracts a private key from the given public key. à » Encrypt: takes as input system parameters, ID, and M à Ã‚ µ m. It returns a ciphertext C à Ã‚ µ c. à » Decrypt: takes as input system parameters, C à Ã‚ µ c, and a private key d. It returns M à Ã‚ µ m. Standard consistency constraint must be satisfied by these algorithms, especially when d is the private key generated by algorithm Extract when it is given ID as the public key, then à ¢Ã‹â€ Ã¢â€š ¬ M à Ã‚ µ m: Decrypt (params, d) = M where C = Encrypt (params, ID, M) [11] Hierarchical Identity-Based Encryption One of the first practical IBE schemes was presented by Boneh and Franklin. Gentry and Silverberg [7] introduced Hierarchical Identity-Based Encryption scheme based on Boneh and Franklins work. In HIBE, private keys are given out by a root PKG to the sub PKGs, which then in turn distribute private keys to individuals (sub PKGs) in their domains. There are IDs associated with the root PKG and the public key of an individual corresponds to these IDs, any sub PKGs on the path from the root PKG to the individual, and the individual. Public parameters are required only from the root PKG for encrypting messages. It has the advantage of reducing the amount o

Bluest Eye :: Essays Papers

Bluest Eye Pecola, an eleven-year-old black girl, is the protagonist of The Bluest Eye. Her family lives in grinding poverty in Lorain, Ohio. By 1941, her parents' marriage had turned bitter and violent. Cholly, her father, is an alcoholic and Pauline, her mother, prefers to retreat into the fantasy world of the movie theater. Surrounded by a culture that equates beauty with whiteness, Pecola becomes convinced that she is ugly because she has African features and dark skin. She prays to God every day for blue eyes, thinking that her family would suddenly become stable and loving if she were beautiful. The Bluest Eye, Toni Morrison’s first novel, examines racism, sexuality, and growing up in a hostile world. The novel focuses on three young girls: Pecola Breedlove and Claudia and Frieda McTeer. Claudia serves as the narrator of the book and summarizes the plot: Pecola was raped by her father, became pregnant with a child that died, and went insane. Cholly Breedlove is Pecola’s alcoholic father that spends time in jail, works on a chain gang, and kills three white men before meeting Pauline in Kentucky. Pauline Breedlove is Pecola's mother. A lonely woman, she is unable to face the pressures of the world; she often retreats to the fantasy world of the Movie Theater. She firmly subscribes to the notion that Caucasian features are the standard of beauty. Furthermore Pecola's parents, Cholly and Pauline, send their daughter to live with the McTeers because their own home has been destroyed in a fire Cholly started. Claudia and Frieda MacTeer are two poor young black girls from Lorain, Ohio. Claudia narrates parts of The Bluest Eye. Life is hard for the sisters, but their stern yet loving parents protects them. After Cholly burns down his family's house, Pecola comes to stay with the MacTeers. Frieda and Claudia quickly befriend her. Claudia resists the white ideal of beauty that entrances Pecola. The two sisters are loyal to Pecola, defending her against the taunts of their classmates and truly pitying her after the rape. They try to save Pecola's baby by planting the marigold seeds they had been selling to earn a new bicycle, but the flowers never bloom and Pecola's baby dies after being born prematurely. Bluest Eye :: Essays Papers Bluest Eye Pecola, an eleven-year-old black girl, is the protagonist of The Bluest Eye. Her family lives in grinding poverty in Lorain, Ohio. By 1941, her parents' marriage had turned bitter and violent. Cholly, her father, is an alcoholic and Pauline, her mother, prefers to retreat into the fantasy world of the movie theater. Surrounded by a culture that equates beauty with whiteness, Pecola becomes convinced that she is ugly because she has African features and dark skin. She prays to God every day for blue eyes, thinking that her family would suddenly become stable and loving if she were beautiful. The Bluest Eye, Toni Morrison’s first novel, examines racism, sexuality, and growing up in a hostile world. The novel focuses on three young girls: Pecola Breedlove and Claudia and Frieda McTeer. Claudia serves as the narrator of the book and summarizes the plot: Pecola was raped by her father, became pregnant with a child that died, and went insane. Cholly Breedlove is Pecola’s alcoholic father that spends time in jail, works on a chain gang, and kills three white men before meeting Pauline in Kentucky. Pauline Breedlove is Pecola's mother. A lonely woman, she is unable to face the pressures of the world; she often retreats to the fantasy world of the Movie Theater. She firmly subscribes to the notion that Caucasian features are the standard of beauty. Furthermore Pecola's parents, Cholly and Pauline, send their daughter to live with the McTeers because their own home has been destroyed in a fire Cholly started. Claudia and Frieda MacTeer are two poor young black girls from Lorain, Ohio. Claudia narrates parts of The Bluest Eye. Life is hard for the sisters, but their stern yet loving parents protects them. After Cholly burns down his family's house, Pecola comes to stay with the MacTeers. Frieda and Claudia quickly befriend her. Claudia resists the white ideal of beauty that entrances Pecola. The two sisters are loyal to Pecola, defending her against the taunts of their classmates and truly pitying her after the rape. They try to save Pecola's baby by planting the marigold seeds they had been selling to earn a new bicycle, but the flowers never bloom and Pecola's baby dies after being born prematurely.

Portrayal of Eve in John Miltons Paradise Lost Essay -- Milton Paradi

Milton's Portrayal of Eve in Paradise Lost      Ã‚  Ã‚   The seventeenth century poet, John Milton, takes the attitude common to the time period while portraying Eve in Paradise Lost.   This epic, telling of Adam and Eve's fall from Paradise and the story of creation, constantly describes Eve as a weak individual, while Adam is often compared with God.   The idea of women's inferiority has been fixed through time, making Milton's characterization of Eve not surprising, but rather expected and accepted.   However, Milton shows a suggestion of women's inner strength while describing the control Eve has over Adam.   Nevertheless, except for this instance, Eve is depicted as subordinate to Adam.   This is evident through Adam and Raphael's treatment of Eve, her own actions, and Milton's description of her.    The first weakness Eve shows is her vanity.   Following her creation, she finds herself staring into a stagnant pool.   She tells Adam, " There I had fixed Mine eyes till now, and pined with vain desire" (IV 465-6).   From the beginning of Eve's life in Paradise, it was understood that she needed Adam to guide her.   During her first talk with him, she whimpers, "And from whom I was formed flesh of thy flesh, And without whom am to no end, my guide And head!" (IV 441-3).  Ã‚   Thus, she believes that only with Adam's guidance will she be able ... ...Elledge, Scott, ed. Paradise Lost: An Authoritative Text, Backgrounds and Sources, Criticism. New York: Norton, 1975. Fox, Robert C. "The Allegory of Sin and Death in Paradise Lost." Modern Language Quarterly 24 (1963): 354-64. Lewis, C. S. A Preface to Paradise Lost. Rpt. New York: Oxford UP, 1979. Milton, John. Paradise Lost. In John Milton: Complete Poems and Major Prose. Ed. Merritt Y. Hughes. Indianapolis: 1980. O'Keeffe, Timothy J. "An Analogue to Milton's 'Sin' and More on the Tradition." Milton Quarterly 5 (1971): 74-77. Patrick, John M. "Milton, Phineas Fletcher, Spenser, and Ovid--Sin at Hell's Gates." Notes and Queries Sept. 1956: 384-86. Portrayal of Eve in John Milton's Paradise Lost Essay -- Milton Paradi Milton's Portrayal of Eve in Paradise Lost      Ã‚  Ã‚   The seventeenth century poet, John Milton, takes the attitude common to the time period while portraying Eve in Paradise Lost.   This epic, telling of Adam and Eve's fall from Paradise and the story of creation, constantly describes Eve as a weak individual, while Adam is often compared with God.   The idea of women's inferiority has been fixed through time, making Milton's characterization of Eve not surprising, but rather expected and accepted.   However, Milton shows a suggestion of women's inner strength while describing the control Eve has over Adam.   Nevertheless, except for this instance, Eve is depicted as subordinate to Adam.   This is evident through Adam and Raphael's treatment of Eve, her own actions, and Milton's description of her.    The first weakness Eve shows is her vanity.   Following her creation, she finds herself staring into a stagnant pool.   She tells Adam, " There I had fixed Mine eyes till now, and pined with vain desire" (IV 465-6).   From the beginning of Eve's life in Paradise, it was understood that she needed Adam to guide her.   During her first talk with him, she whimpers, "And from whom I was formed flesh of thy flesh, And without whom am to no end, my guide And head!" (IV 441-3).  Ã‚   Thus, she believes that only with Adam's guidance will she be able ... ...Elledge, Scott, ed. Paradise Lost: An Authoritative Text, Backgrounds and Sources, Criticism. New York: Norton, 1975. Fox, Robert C. "The Allegory of Sin and Death in Paradise Lost." Modern Language Quarterly 24 (1963): 354-64. Lewis, C. S. A Preface to Paradise Lost. Rpt. New York: Oxford UP, 1979. Milton, John. Paradise Lost. In John Milton: Complete Poems and Major Prose. Ed. Merritt Y. Hughes. Indianapolis: 1980. O'Keeffe, Timothy J. "An Analogue to Milton's 'Sin' and More on the Tradition." Milton Quarterly 5 (1971): 74-77. Patrick, John M. "Milton, Phineas Fletcher, Spenser, and Ovid--Sin at Hell's Gates." Notes and Queries Sept. 1956: 384-86.

Egyptian Jewerly and Makeup :: essays research papers

Egyptian Jewelry and Makeup   Ã‚  Ã‚  Ã‚  Ã‚  Everyday in the Egyptian way of life, both men and women would adorn themselves with beautiful jewelry and makeup. Wearing these pieces of jewelry and makeup was part of their everyday life.   Ã‚  Ã‚  Ã‚  Ã‚  Everyone, man or woman, Egypt wore more type of jewelry. What kind of jewelry they wore was usually dependent on how wealthy they were. The rich wore fine jewelry made from gold, silver, or electrum inlaid with precious stones. The less wealthy wore jewelry that was made of copper or faience, which is made by heating powdered quartz.   Ã‚  Ã‚  Ã‚  Ã‚  Ring and amulets were especially worn to ward off evil spirits and/or injury. Cowrie shells were worn to show the desire of the wearer to have children. They also wore jewelry with the god Heh, which means the god of ‘millions of years’, which symbolizes long life. Younger Egyptians wore charms that resembled beards or side locks of hair to symbolize youth and innocence. Perhaps the most interesting fact about jewelry was that many children wore fish amulets to prevent from downing and accidents in the Nile River.   Ã‚  Ã‚  Ã‚  Ã‚  Jewelry was also a reward to people for outstanding services to the community. The jewelry was hanged out by the king. The king would lean out of windows and drops bracelets or collars to the nobles waiting respectfully below.   Ã‚  Ã‚  Ã‚  Ã‚  The gold that was used to make jewelry in Egyptian times was not scarce like it is in present day. Mines between the Nile River and Red Sea coast yielded large quantities of this precious metal. They also imported precious stones from the Sinai Peninsula and even Afghanistan. The Egyptians, however, had no knowledge of the gemstones and jewels we have today, such as diamonds, emeralds, and rubies.   Ã‚  Ã‚  Ã‚  Ã‚  The Egyptians were big lovers of all beauty and fashion. They were such lovers of beauty that some of their names were based on the word ‘nefer’, which means beautiful. Examples of such were Nefert, Nefertiti, and Nefertari. The goddess associated with adornment was â€Å"Hathor the Golden†, who is seen as the ideal of beauty in love and poetry of the time.   Ã‚  Ã‚  Ã‚  Ã‚  Both Egyptian men and women wore makeup, such as eye paint. For their eye paint and eye shadow they used a mineral called Kohl. Apart from making their eyes look brighter, and larger, Kohl was once believed to have the value as a protection against eye disease. Its blackness also controls the sun’s glare in the desert.