The method is named after Julius Caesar, who used it in his private correspondence. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. 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. Caesar Cipher is one of the simplest and most widely known encryption techniques. In this post, we will discuss the Caesar Cipher Algorithm and also write a program for the Caesar Cipher algorithm. There are exceptions and some cipher systems may use slightly more, or fewer, characters when output versus the number that was input. In common parlance, “cipher” is synonymous with “ code“, as they are both a set of steps that encrypt a message however, the concepts are distinct in cryptography, especially classical cryptography.Ĭodes generally substitute different length strings of character in the output, while ciphers generally substitute the same number of characters as are input. To encipher or encode is to convert information into cipher or code. An alternative, less common term is encipherment. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption-a series of well-defined steps that can be followed as a procedure.
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