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1 Image Processing & Communications

1 2009

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Image encryption using edge diffusion and selective permutations in orthogonal polynomials based transformation domain

Krishnamoorthi R., Sheba Kezia Malarchelvi P. D.

Image Processing & Communications

2009

Vol. 14, no 4

13-27

This paper proposes a new image encryption technique in orthogonal polynomials based transformation domain (OPT) with edge diffusion and selective combinational permutations for secure transmission of images. In this technique, we propose the use of the polynomials based edge detection algorithm to decompose the image blocks into edge blocks and non-edge blocks. The edge blocks are first encrypted with a cryptographic algorithm and then a selective combinational permutation is applied over the low frequency coefficients of the edge as well as non-edge blocks in order to reduce the number of bits to be permuted. Then a combinational shuffling of bits, coefficients and blocks are carried out in addition to sign bit encryption. A symmetric key based cryptographically secure pseudo random process controls the entire encryption process. Experimental results reveal that the proposed encryption scheme provides very low encryption PSNRs and security analyses prove that the proposed technique offers effective encryption.