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1.14 CONVENTIONAL ENCRYPTION • Referred conventional / private-key / single-key • Sender and recipient share a common key All classical encryption algorithms are private-key was only type prior to invention of public- key in 1970‟ plaintext - the original message Some basic terminologies used: • cipher text - the coded message • Cipher - algorithm for transforming plaintext to cipher text • Key - info used in cipher known only to sender/receiver • encipher (encrypt) - converting plaintext to cipher text • decipher (decrypt) - recovering cipher text from plaintext • Cryptography - study of encryption principles/methods • Cryptanalysis (code breaking) - the study of principles/ methods of deciphering cipher text
1.3基本概念1.4密码
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