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substitution cipher

substitution cipher

A Dictionary of Computing | 2004 | | Copyright

substitution cipher A cipher, or a component of a more complicated cipher, that involves the symbol at each place in the plaintext being (effectively) looked up in a table, and replaced by the substitute symbol found there. Since a cipher must be invertible (for decryption), the table must contain a permutation of the alphabet (compare transposition cipher).

The size of the table can be increased (to strengthen the cipher) by using an extension of the plaintext source. If the table remains constant for the entire plaintext, the substitution is monalphabetic; if it changes with each advance of one symbol position in the plaintext, possibly repeating a fixed schedule, it is polyalphabetic.
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substitution cipher

A Dictionary of the Internet | 2001 | | Copyright

substitution cipher A form of ENCRYPTION which substitutes symbols in a PLAIN TEXT with other symbols. Such ciphers are usually very easy to crack. See ROT13.
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DARREL INCE. "substitution cipher." A Dictionary of the Internet. 2001. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O12-substitutioncipher.html

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