Abstract
In the ancient block Hill cipher, the cipher text is obtained by multiplying the blocks of the plain text with the key matrix. To strengthen the keymatrix, a double guard Hill cipher was proposed with two key matrices, a private key matrix and its modified key matrix along with permutation. In the ancient block Hill cipher, the cipher text is obtained by multiplying the blocks of the plain text with the key matrix. To strengthen the key matrix, a double guard Hill cipher was proposed with two key matrices, a private key matrix and its modified key matrix along with permutation. In this paper a novel modification is performed to the double guard Hill cipher in order to reduce the number of calculation to obtain the cipher text by using non-square matrices. This modified double guard Hill cipher uses a non-square matrix of order (p × q) as its private keymatrix.
Highlights
Recent advancement in computer industry, communication and technology leads to an information revolution for past two decades
In the modified double guard Hill cipher the encryption time is reduced as it avoid the permutation and the transmitted are reduced as it avoids the transmission of ‘U’ matrix along with the cipher text
In the modified double guard Hill cipher the encryption time is reduced by reducing the number of computation, it reduce the bits transmitted when compared with double guard Hill cipher
Summary
Recent advancement in computer industry, communication and technology leads to an information revolution for past two decades. Saeednia [14] proposed a secured Hill cipher by permuting the rows and columns of the key matrix randomly, still it is vulnerable to known plaintext attack. The security level of the cryptosystem is strengthen by modifying the private key matrix of the Hill cipher and proposed a double guard Hill cipher [19]. It supports ASCII values and the private key matrix is permutated to triumph over the known plaintext attack. In order to reduce the computation time efficiently, the number of calculation can be reduced to minimize the energy consumed in the proposed modified Double Guard Hill cipher (MDGHC)
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