Abstract
In this paper we have devoted our attention to the study of large block cipher by employing the basic concepts of the advanced Hill cipher. In this the computation of the inverse of a matrix is very simple as we have confined our attention to an involutory matrix, i.e., a matrix whose inverse is the same as the original matrix. The avalanche effect and the cryptanalysis carried out in this investigation, to check the strength of the cipher, prominently indicate that the cipher is a potential one, and it can be applied to a plaintext of any length Keywords: key, involutory matrix, cryptanalysis, avalanche effect, Ciphertext, block cipher
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