Electronic codebook - PowerPoint PPT Presentation

Algorithms for encryption

Algorithms for encryption. Historical perspective. Caesar cipher: letter = letter + 3 ‘fish’ ‘ilvk’ rot13: Add 13/swap alphabet halves •Usenet convention used to hide possibly offensive jokes •Applying it twice restores the original text Substitution Ciphers Simple substitution cipher:

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More About DES

More About DES. Cryptography and Network Security. Reference: Sec 3.1 of Stallings Text. Block Cipher Modes of Operation. Sec 3.7 of text How is DES used in applications? Input to encryption is not always the bits of the plaintext Modes Electronic Codebook (ECB)

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