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Network Security: Chapter 2 - Nguyen Cao Dat, Tran Van Hoai

Network Security: Chapter 2 - Symmetric Ciphers includes about Symmetric Encryption, Some Basic Terminology, Symmetric Cipher Mode, Classical Substitution Ciphers, Transposition Ciphers, Product Ciphers, Rotor Machines, Modern Block Ciphers. | Chapter 2 Symmetric Ciphers MSc. NGUYEN CAO DAT Dr. TRAN VAN HOAI Symmetric Encryption or conventional I private-key I 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 s and by far most widely used 2 Some Basic Terminology plaintext - original message ciphertext - coded message cipher - algorithm for transforming plaintext to ciphertext key - info used in cipher known only to sender receiver encipher encrypt - converting plaintext to ciphertext decipher decrypt - recovering ciphertext from plaintext cryptography - study of encryption principles methods cryptanalysis codebreaking - study of principles methods of deciphering ciphertext without knowing key cryptology - field of both cryptography and cryptanalysis