I. What is Cryptography? Do you have a message which is so confidential that you need to send to a certain person but you’re afraid that somebody might read it? Well you better study about CRYPTOGRAPHY. But first what is cryptography? Cryptography is the study of hiding readable messages (plaintext) into a non-readable form (ciphertext). Based on my other source Cryptography is the practice and study of techniques for secure communication in the presence of third parties. To make it simple‚ Cryptography
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CRYPTOGRAPHY- ENCRYPTION AND DECRYPTION Cryptography is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). More generally‚ it is about constructing and analyzing protocols that overcome the influence of adversaries and which are related to various aspects in information security such as data confidentiality‚ integrity‚ authentication‚ and non-repudiation. Modern cryptography intersects the disciplines of mathematics‚ computer science
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cryptographic algorithms‚ and they are used to attempt to decrypt data without prior access to a key. They are part of Cryptanalysis‚ which is the art of deciphering encrypted data. Cryptanalysis and Cryptography (the art of creating hidden writing‚ or ciphers) form the science of Cryptology. Cryptographic Attack Methods There are six related cryptographic attack methods‚ including three plaintext-based methods and three ciphertext-based methods: These methods are used as the foundation of cryptographic
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4‚ 5‚ ….). The encrypted binary string is formed by shifting the bit position of each block by a certain values for a certain number of times and from this string cipher text is formed. Combination of values of block length‚ number of blocks and no. of iterations generates the session based key for SBSKCT. For decryption the cipher text is considered as binary string. Using the session key information‚ this binary string is broken down into blocks. The decrypted binary string
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believe that the message was considered symmetric is because in symmetric encryption a message is sent in cipher text and the person that is meant to receive the message has a code to convert the message from Cipher text to plain text. This is the method that Zimmermann used in his telegram. Zimmerman and the intended receiver of the message shared the key that decrypted the message from cipher text to plain text. Therefore the telegram used symmetric encryption. Asymmetric encryption can be ruled
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who should not be there. back up:copy the info. security auditing software: checks out the weakness of your computer. .encryption: method for scrambling and concealing. Decryption: proces for transforming cipher text to plain text. ciper: transpotation : 1-800-free MSN rail Frence Cipher UIGETBSRA Reverse DEREU QNOIC WASIE MACI 10. DFS: the use of scientifically derived and proven methods through preservation‚ collection and validation…. subcatergory: Media analysis: physical media for evidence
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encryption algorithm. True 5 True or False: RC4 is an asymmetric encryption algorithm. False 6 Identify a security principle that can be satisfied with an asymmetric digital signature and not by a symmetric signature. nonrepudiation 7 True or False: Cipher text is a mechanism for accomplishing confidentiality‚ integrity‚ authentication‚ and nonrepudiation. False 8 True or False: Cryptography is a mechanism for accomplishing confidentiality‚ integrity‚ authentication‚ and nonrepudiation. True 9 True
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ENCRYPTION Introduction Often there has been a need to protect information from ’prying eyes’. In the electronic age‚ information that could otherwise benefit or educate a group or individual can also be used against such groups or individuals. Industrial espionage among highly competitive businesses often requires that extensive security measures be put into place. And‚ those who wish to exercise their personal freedom‚ outside of the oppressive nature of governments‚ may also wish to encrypt
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INFORMATION SYSTEMS AND SECURITY AUDIT 1. Define the following terms: (6 Marks) -Integrity In information security‚ integrity means that data cannot be modified undetectably. This is not the same thing as referential integrity in databases‚ although it can be viewed as a special case of Consistency as understood in the classic ACID model of transaction processing. Integrity is violated when a message is actively modified in transit. Information security systems typically provide message integrity
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In the history of cryptography‚ the Enigma was a portable cipher machine used to encrypt and decrypt secret messages. More precisely‚ Enigma was a family of related electro-mechanical rotor machines comprising a variety of different models. The Enigma was used commercially from the early 1920s on‚ and was also adopted by the military and governmental services of a number of nations most famously by Nazi Germany before and during World War II. The German military model‚ the Wehrmacht Enigma
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