Abstract
In this paper, we have developed a novel block cipher involving a key bunch matrix supported by a key-based permutation and a key-based substitution. In this analysis, the decryption key bunch matrix is obtained by using the given encryption key bunch matrix and the concept of multiplicative inverse. From the cryptanalysis carried out in this investigation, we have seen that the strength of the cipher is remarkably good and it cannot be broken by any conventional attack.
Highlights
In this paper, we have developed a novel block cipher involving a key bunch matrix supported by a key-based permutation and a key-based substitution
We have developed a set of block ciphers [7], [8], [9], “in press” [10], “unpublished” [11], [12], wherein, a secret key bunch matrix plays a prominent role
Our objective is to develop a novel block cipher, by using the encryption key bunch matrix, and applying a key-based permutation and substitution which strengthen the cipher in a significant manner
Summary
To have a clear insight into the key dependent permutation process and key dependent substitution process, which we are adopting in this analysis, let us consider a typical example. We write the elements of this key in a tabular form as shown below. The first row shows the serial number and the second row is concerned to the elements in the key K. On considering the order of magnitude of the elements in the key, we can write the above table, by including one more row, in the following form
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