Caesar cipher
nounUS /ˈsizəɹ ˈsaɪfər/
Etymology From its supposed use by Julius Caesar to communicate with his generals.
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Computing, Cryptography, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A simple form of encryption in which each letter in the plaintext is shifted through the alphabet a number of positions (for example A→D, B→E, C→F, etc.).