A Block Cipher Having a Key on One Side of the Plain Text Matrix and its Inverse on the Other Side

Abstract

Abstract-In this paper, we have modified the Hill cipher by developing an iterative procedure consisting of three steps. In the first step, the plain text matrix is multiplied with the key matrix on one side and with its inverse on the other side. In the second step, the plain text matrix is mixed thoroughly by using a function called Mix ( ). In the last step, the plain text matrix is modified by using XOR operation between the plain text matrix and the key matrix. The cryptanalysis and the avalanche effect discussed in this paper, conspicuously indicate that the cipher is a strong one and it is quite comparable with the other block ciphers.1

A New Approach to Enhance Avalanche Effect in Aes to Improve Computer Security

“…Symmetric cryptography technique are very efficient in practically than asymmetric cryptography technique, most security applications use symmetric cryptography to ensure the privacy/confidentiality, the integrity and the authenticity of sensitive/ secured data. Even most applications of such type cryptography are actually working in a hybrid manner by transmitting a cipher key with asymmetric techniques while symmetrically encrypting the payload data under the cipher key [5,6]. A cryptosystem is an algorithm or some predefine steps, which include all possible plaintexts/characters, cipher texts, and keys value.…”