Encyclopedia > Substitution ciphers

  Article Content

Substitution cipher

Redirected from Substitution ciphers

A substitution cipher is one that replaces each plaintext symbol for another ciphertext symbol. The receiver decodes using the inverse substitution. Examples are Caesar ciphers (such as ROT13) and the atbash cipher.

Modern Feistel ciphers[?] such as DES and Rijndael are similar in principle to substitution ciphers. They treat each 64-bit or 128-bit block of the plaintext as a symbol and perform several rounds of substitutions and transpositions on the bits in the block to approximate a general block-to-block substitution.


See also:



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
1981 in television

... in television See also: 1980 in television, other events of 1981, 1982 in television and the list of 'years in television'. Table of contents 1 Events 2 ...