An Efficient Encryption Scheme for Color Images Using Transpose, Interweaving and Iteration Method

Many digital services require reliable security in storage and transmission of multimedia contents. Due to the rapid growth of the internet in the digital world today, the security of multimedia contents like digital images has become more important and attracted much attention. An encryption techniques gives protection against illegal duplication and manipulation of multimedia contents. The transposition or permutation of characters in the plaintext is responsible for confusion, and the influence of each bit of the key on each plaintext causes diffusion .The goal of this paper is to create cryptosystem to encrypt color images by shuffling pixel values using transpose, Interweaving and Iteration method on each block. In this method the given Image is divided in to number of blocks based on required size. The image pixel values of the transposed modified plaintext are rearranged by transposition of the binary bits belonging to the neighboring rows and columns in each iteration. The decimal values of modified interweaved matrix is multiplied with key matrix to yield cipher text of the image. This method gives strong cipher of the image, whose key length is significantly large.