A Large Block Cipher using an Iterative Method and the Modular Arithmetic Inverse of a key Matrix
S. Udaya Kumar, U. K. Sastry, Anindita Adikaputri Vinaya · 2006
In this paper, we have developed a block cipher for blocks of size 196 bits and 392 bits. In this, we have represented the plaintext in the form of a matrix of size 28 x 7, consisting of binary bits. The key matrix is represented in the form of a matrix of size 28 x 28, and it comprises binary bits. In the process of decryption, we have used the modular arithmetic inverse (K -1 ) of the key matrix K. From the cryptanalysis carried out in this paper, we conclude that the cipher cannot be broken by any cryptanalytic attack.