![]() If there is an odd number of letters, a Z is added to the last letter. ![]() ![]() The key table works out to be −įirst, a plaintext message is split into pairs of two letters (digraphs). The rest of the table will be filled with the remaining letters of the alphabet, in natural order. In a key table, the first characters (going left to right) in the table is the phrase, excluding the duplicate letters. The sender and the receiver deicide on a particular key, say ‘tutorials’. If the plaintext contains J, then it is replaced by I. Each of the 25 alphabets must be unique and one letter of the alphabet (usually J) is omitted from the table as we need only 25 alphabets instead of 26. The key table is a 5×5 grid of alphabets that acts as the key for encrypting the plaintext. In playfair cipher, initially a key table is created. In this scheme, pairs of letters are encrypted, instead of single letters as in the case of simple substitution cipher.
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