%0 Journal Article %T A Novel Block Cipher Involving a Key Bunch Matrix and a Permutation %A V.U.K. Sastry %A Shirisha Kakarla %J International Journal of Computer & Electronics Research %D 2012 %I Eoryx Publications %X 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. %K Key bunch matrix %K encryption %K decryption %K permutation %K avalanche effect %K cryptanalysis %U http://ijcer.org/index.php/ojs/article/view/65