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Definition of Substitution cipher
1. Noun. (cryptography) a method of encryption by which units of plaintext are substituted 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 substitution. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Substitution Cipher
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