Abstract—In this investigation, we have generalized and modified the Playfair cipher into a block cipher. Here, we have introduced substitution, interweaving and iteration. The cryptanalysis and the avalanche effect carried out in this analysis markedly indicate that the cipher is a strong one, and it cannot be broken by any cryptanalytic attack.
Index Terms—interweaving, inverse interweaving, substitution matrix.
V. Umakanta Sastry is with the Department of Computer Science and Engineering, Sreenidhi Institute of Science and Technology, India. Phone:919985012707, fax:914027640394, e-mail: vuksastry@rediffmail.com.
N. Ravi Shankar is with the Department of Computer Science and Engineering, Sreenidhi Institute of Science and Technology, Hyderabad, India.
S. Durga Bhavani is with the School of Information Technology, J.N.T. University, Hyderabad, India.
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Cite: V. Umakanta Sastry, N. Ravi Shankar, and S. Durga Bhavani, "A Modified Playfair Cipher Involving Interweaving and Iteration,"
International Journal of Computer Theory and Engineering vol. 1, no. 5, pp. 597-601, 2009.
