A Novel Block Cipher Involving a Key Bunch Matrix and a Permutation

In this paper, we have developed a block cipher involving a key bunch matrix. In each round of the iteration process we have introduced a permutation process, wherein we have converted the plaintext matrix into binary bits, arranged in a row wise manner, and offered right rotation to the first row and downward rotation to the first column. Then on seeing the resulting matrix as a bunch of sub-matrices, we have swapped the sub-matrices. The cryptanalysis carried out in this investigation shows very clearly that this cipher cannot be broken by any attack.