![]() To encrypt the plaintext or the message we add the shift, taken as input from the user to the mapped representation of the extracted letter in the Step 1.The Vigenère cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. ![]() Step 2(Encrypting and Obtaining CipherText) : We start this by representing or transforming each letter into numbers, therefore the alphabets will be mapped to the numbers starting from 0, example, A = 0, B = 1. ![]() (We can also modify the algorithm for moving up the character it’s up to the user, in that scenario if shift equals 2, A will be replaced by Y, B will be replaced by Z, and so on.) Implementation Step 1(Mapping Plaintext) : This fixed number here indicates the shift, which means the number of positions by which each letter of the text has to be moved down. We decide that fixed number, for example, if we select that number as 2 then A will be replaced by C, B will be replaced by D, and so on. It is a simple type of substitution cipher, in this, each letter or word of a given text message is replaced by a letter some fixed number down the original alphabet. Now since we know all the related terms let’s discuss the actual algorithm of Caesar Cipher Algorithm Note : The terms are explained in the order in which they are used in cryptography. In most of the cases, the algorithms are reversible in nature, therefore in those cases, we directly apply the same encryption algorithm in a reverse way.
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