Implementation of Caesar cipher algorithm.
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
AlgorithmThe encryption can also be represented using modular arithmetic by first transforming the letters into numbers, according to the scheme, A → 0, B → 1, ..., Z → 25. Encryption of a letter x by a shift n can be described mathematically as,
\[ E(x) = (x + n)\;\mbox{mod}\; 26\]
while decryption can be described as,
\[ D(x) = (x - n) \;\mbox{mod}\; 26\]
Definition in file caesar_cipher.cpp.
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