General Information
    • ISSN: 1793-8201 (Print), 2972-4511 (Online)
    • Abbreviated Title: Int. J. Comput. Theory Eng.
    • Frequency: Quarterly
    • DOI: 10.7763/IJCTE
    • Editor-in-Chief: Prof. Mehmet Sahinoglu
    • Associate Editor-in-Chief: Assoc. Prof. Alberto Arteta, Assoc. Prof. Engin Maşazade
    • Managing Editor: Ms. Mia Hu
    • Abstracting/Indexing: Scopus (Since 2022), INSPEC (IET), CNKI,  Google Scholar, EBSCO, etc.
    • Average Days from Submission to Acceptance: 192 days
    • E-mail:
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Prof. Mehmet Sahinoglu
Computer Science Department, Troy University, USA
I'm happy to take on the position of editor in chief of IJCTE. We encourage authors to submit papers concerning any branch of computer theory and engineering.

IJCTE 2013 Vol.5(4): 626-628 ISSN: 1793-8201
DOI: 10.7763/IJCTE.2013.V5.762

A Modified Version of Playfair Cipher Using 7×4 Matrix

A. Aftab Alam, B. Shah Khalid, and C. Muhammad Salam

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:,,


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.

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