Classical-Cryptography - Classical Cryptography...

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Introduction to Cryptography cryptography is the study of secret (crypto-) writing (-graphy) concerned with developing algorithms which may be used to: conceal the context of some message from all except the sender and recipient (privacy or secrecy), and/or verify the correctness of a message to the recipient ( authentication ) form the basis of many technological solutions to computer and communications security problems for a good overview paper see: W Diffie, M E Hellman, "Privacy and Authentication: An Introduction to Cryptography", in Proc. IEEE, Vol 67(3) Mar 1979, pp 397-427 Basic Concepts cryptography the art or science encompassing the principles and methods of transforming an intelligible message into one that is unintelligible, and then retransforming that message back to its original form plaintext the original intelligible message ciphertext the transformed message cipher an algorithm for transforming an intelligible message into one that is unintelligible by transposition and/or substitution methods key 9/1/2010 Classical Cryptography williamstallings.com/…/classical.html 1/20
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