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
Distributed programming

... that are typically human readable. Examples include XML, HTML, SGML, X.500, and EDI. Tightly coupled (clustered) -- refers typically to a set of hightly integrated ...