A Survey Paper on Different Modification of Playfair Cipher
Bhavya Alankar, Mohammad Haris · International Journal of Advanced Research in Computer Science · 2017
Working of Playfair cipher depends on the characters that are first grouped in blocks and later substituted. We can add as many as block of messages but the size should be defined as 2 alphabets per block, known as diagraphs.Playfair cipher operates on block of characters encrypting and decrypting two characters at a time. In this cipher, the plain text digraphs are converted to cipher text digraphs and the cipher text digraphs are converted to decrypted text digraphs using a shared key known to both the encrypter and decrypter. Due to the traditional 5 x 5 matrix used in Playfair cipher it supports twenty five uppercase alphabets only. To overcome the drawbacks and limitations, various authors have proposed their modifications of Playfair cipher. The paper contains different variants of Playfair cipher proposed by different scholars on the basis of their respected parameters.