playfair密码_密码学中的Playfair密码

playfair密码

Playfair cipher is also a substitution cipher technique but it is a bit different than other substitution cipher techniques. Its rules are different. In this cipher, we already know the plain text and the keyword. In this technique, we have to construct a matrix of 5x5 and we have to put each letter of the keyword in that matrix. We should start with the first block of the matrix and fill it horizontally. When the keyword is filled in that matrix then put all the other remaining alphabets in that matrix. The 5x5 matrix is the base structure of this technique. Total blocks in the matrix are 25 and there are 26 alphabets so we have to put 'i' and 'j'

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playfair密码_密码学中的Playfair密码

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