IS383-7-Cryptography.ppt - IS383 Second level Information...

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Click to edit Master text styles Second level Third level Fourth level » Fifth level 1 IS383 Information systems Security Unit 7: Basic Cryptography Source: Chapter [email protected] Michael E. Whitman and Herbert J. Mattord (2012): Principles of Information Security , 4 th Edition. Course Technology, Cengage Learning
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Click to edit Master text styles Second level Third level Fourth level » Fifth level 2 Learning Objectives Upon completion of this material, you should be able to: Chronicle the most significant events and discoveries in the history of cryptology Explain the basic principles of cryptography Describe the operating principles of the most popular cryptographic tools List and explicate the major protocols used for secure communications Discuss the nature and execution of the dominant methods of attack used against cryptosystems
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Click to edit Master text styles Second level Third level Fourth level » Fifth level 3 Introduction Cryptology: science of encryption; combines cryptography and cryptanalysis Cryptography: process of making and using codes to secure transmission of information Cryptanalysis: process of obtaining original message from encrypted message without knowing algorithms Encryption: converting original message into a form unreadable by unauthorized individuals Decryption: the process of converting the ciphertext message back into plaintext
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Click to edit Master text styles Second level Third level Fourth level » Fifth level 4 Foundations of Cryptology Cryptology has a long and multicultural history With emergence of technology, need for encryption in information technology environment greatly increased All popular Web browsers use built-in encryption features for secure e-commerce applications
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Click to edit Master text styles Second level Third level Fourth level » Fifth level 5 Encryption definitions Algorithm: The mathematical formula used to convert an unencrypted message into an encrypted message Cipher: The transformation of the individual components (characters, bytes, or bits) of an unencrypted message into encrypted components. Ciphertext or cryptogram: The unintelligible encrypted or encoded message resulting from an encryption Code: The transformation of the larger components (words or phrases) of an unencrypted message into encrypted components Cryptosystem: The set of transformations necessary to convert an unencrypted message into an encrypted message Decipher: To decrypt or convert ciphertext to plaintext Encipher: To encrypt or convert plaintext to ciphertext
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Click to edit Master text styles Second level Third level Fourth level » Fifth level 6 Encryption definitions (cont’d.) Key or cryptovariable: The information used in conjunction with the algorithm to create ciphertext from plaintext Keyspace: The entire range of values that can possibly be
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