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A Modern Advanced Hill Cipher Involving XOR Operation and a Permuted Key

V.U.K.Sastry, Aruna Varanasi and S.Udaya Kumar

In this paper, we have developed a block cipher by extending the analysis of the advanced Hill cipher. In this, besides the u sual involutory matrix, which contains the key, we have included another matrix, which is obtained by permuting the original involutory matrix. This analysis is strengthened by using the xor operation, modular arithmetic and a function called mix(), which mixes the binary bits of the plaintext and the involutory matrix, which includes the key. The avalanche effect and the cryptanalysis carried out in this investigation clearly indicate that the strength of the cipher is quite significant.