
In cryptography, a substitution cipher is a method of encoding by which units of plaintext are replaced with ciphertext, according to a regular system; the `units` may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitut.....
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(from the article `cipher`) ...product ciphers. In transposition cipher systems, elements of the plaintext (e.g., a letter, word, or string of symbols) are rearranged without ... In substitution ciphers, units of the plaintext (generally single letters or pairs of letters) are replaced with other symbols or groups of symbols, ... [2 ...
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A cipher that replaces each plaintext symbol for another, ciphertext symbol. The receiver decodes using the inverse substitution. A simple example is the Caesar cipher.
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a cipher that replaces letters of the plain text with another set of letters or symbols. Cf.
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