Abstract—This paper deals with the modification of playfair cipher. The original 5×5 matrix playfair cipher is modified to 7×4 matrix playfair c “*” and “#” are included. The addition of these two symbols in the matrix creates one-to-one correspondence between the plaintext and the ciphertext, which makes the encryption and decryption easy and unambiguous. The text is more unreadable when these symbols appear in the resulting ciphertext. Also this method can be extended to encrypt and decrypt the messages of any language by taking a proper size matrix. ipher in which two symbols
Index Terms—Cryptography, ciphertext, plaintext, playfair cipher, substitution cipher, transposition cipher.
The authors are with the Department of Computer Science & IT University of Malakand Chakdara KPK Pakistan (e-mail: alam@uom.edu.pk, shshkhalid@uom.edu.pk, msmdir@gmail.com).
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Cite:A. Aftab Alam, B. Shah Khalid, and C. Muhammad Salam, "A Modified Version of Playfair Cipher Using 7×4 Matrix," International Journal of Computer Theory and Engineering vol. 5, no. 4, pp. 626-628, 2013.
