substitution cipher

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substitution cipher

[‚səb·stə′tü·shən ‚sī·fər]
(communications)
A cipher in which the characters of the original message are replaced by other characters according to a key.
References in periodicals archive ?
Since it is a simple substitution cipher, fans deciphered the alphabet within half an hour of the show coming out.
Gnomish from Artemis Fowl is an easy language to learn to read, as it is a simple substitution cipher. There are two extra alphabets, no numbers, no capitals, and only two pronunciation marks.
Our students enjoyed trying to solve a simple substitution cipher using frequency tables.
About 2,000 years ago, transposition ciphers had made the barest appearance and Julius Caesar carried on correspondence in a very simple substitution cipher. About 1,000 years ago, simple substitution ciphers were familiar enough for their weaknesses to be understood and for people to begin exploring more complex systems intended to counter those weaknesses.
Criminals typically use homemade, simple substitution cipher systems which use a single cipher text character to replace a plain text character.
Using these and many other known language characteristics, a cryptanalyst can often decipher a simple substitution cipher with little difficulty.
Cryptanalysis of the Playfair cipher is much more difficult than normal simple substitution ciphers, because digraphs (pairs of letters) are being substituted instead of monographs (single letters) [20].
Experiments with relaxation algorithms for breaking simple substitution ciphers. Comput.