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

100%

Krishnamoorthi R. , Sheba Kezia Malarchelvi P. D.

tom 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.

Image encryption based on Chebyshev chaotic map and S8 S-boxes

88%

Hussain I. , Anees A. , Alkhaldi A. H. , Aslam M. , Siddiqui N. , Ahmed R.

tom Vol. 49, nr 2

317--330

The encryption of image data is artful as compare to others due to some special characteristics such as entropy, contrast, the correlation between the pixels, intensity, and homogeneity. During encryption process, it is conventionally not easy to manage these characteristics with non-chaotic cryptosystems. Therefore for the sake of strong encryption algorithms, in last decades many cryptographers have presented invulnerable schemes for image encryption based on the chaotic maps. This manuscript aims to propose a strong encryption scheme based on a symmetric group of permutation advanced encryption standard (AES) substitution boxes and modified Chebyshev map. Principally, the secret key depends upon the parameters of Chebyshev map to create confusion in the main image and is encrypted by the scheme made from the S8 AES S-boxes and chaotic map. By this procedure, one can obtain an encrypted image that is entirely twisted. The results of analyses showed that the presented image encryption is strong and invulnerable.

Color image encryption using singular value decomposition in discrete cosine Stockwell transform domain

88%

Vaish A. , Kumar M.

tom Vol. 48, nr 1

25--38

In this paper, an image encryption technique using singular value decomposition (SVD) and discrete cosine Stockwell transform (DCST) is proposed. The original source image is encrypted using bands of DCST along with the SVD decomposed images. The number of bands in DCST, parameters used to mask the singular values, the way of permutation used to shuffle the values of SVD transformed images and the way of arrangement of SVD matrices are used as encryption keys. It is necessary to have correct knowledge of all the keys along with their respective values, for correct decryption of encrypted images. The robustness and the quality measurement of proposed work are analyzed by comparing it with some existing works.

Double-image encryption scheme based on the phase-truncated multiple-parameter Fresnel transform

88%

Zhou L. , Zhou H. , Ma Y. , Zhou N.-R.

tom Vol. 52, nr 2

163--177

A double-image encryption algorithm is proposed with the phase-truncated multiple-parameter Fresnel transform. Firstly, the pixel positions of two plaintext images are scrambled and then the results are merged into one image with the scrambling operation. Subsequently, the resulting image is encrypted by phase truncation and phase reservation in the multiple-parameter Fresnel transform domain. The phase information is scrambled by the affine transform and then recombined with the amplitude information. The final encryption image is obtained with the pixel scrambling and diffusion methods to further enhance the security of the image encryption system, where the scrambling and diffusion operations are based on logistic map, logistic-sine system and 2D logistic-adjusted-sine map. The image encryption scheme is robust against the common attacks due to the nonlinear properties of diffusion and phase truncation. Numerical simulation results verify the performance and the security of the proposed double-image algorithm based on the phase-truncated multiple-parameter Fresnel transform.