Definition:Substitution Cipher
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Definition
A substitution cipher is a cipher in which each letter is encoded by substituting for it a different letter, or string of letters.
Mono-Alphabetic
A mono-alphabetic substitution cipher is a substitution cipher in which each individual letter is replaced by a letter, or string of letters, from a single alphabet.
Polyalphabetic
A polyalphabetic substitution cipher is a substitution cipher that uses two or more alphabets.
Such a cipher will include rules under which alphabet is to be applied to which symbols in the plaintext.
Also see
- Results about substitution ciphers can be found here.
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): substitution cipher