Abstract
Modifying Playfair Cipher Algorithm by using Legendre Symbol
Highlights
Securing the transmitted data mathematically over the unsecure channels can be achieved by using cryptosystem algorithms [1]
Bhattacharyya et al [1] argue that the standard Playfair cipher, which uses 5 × 5 table and a keyword is placed in that table, can be safer by using six 10 × 9 tables with six iterations
Murali and Senthil Kumar [2] claim that the security of transmitting data over unsecured classical channels is increased by combining Playfair cipher with Linear Feedback Shift Register (LFSR)
Summary
Securing the transmitted data mathematically over the unsecure channels can be achieved by using cryptosystem algorithms [1] One of those algorithms is Playfair cipher which uses a 5 × 5 table of 25 unduplicated English alphabets with a keyword is inserted in the table. Iqbal et al [3] present an algorithm of Playfair cipher by using Excess 3 Code (X S3) with Ceasar Cipher This algorithm uses a 6 × 6 table containing only integers and alphabets. Kansal et al [6] state that, Playfair cipher can be modified by using the properties of each of`DNA strands'' and amino acids This modification is based on converting the plaintext (before the encryption has been done) in turn to the forms: binary, DNA, and to the amino acid form.
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