ICTACT Journal on Image and Video Processing

R. Ranjith Kumar ¹, B. Saranraj ¹, S. Pradeep ¹

Affiliations
1 Department of Electronics and Communication Engineering, P.A. College of Engineering and Technology, IN

Abstract

This paper presents a bit level pixel by pixel chaotic image encryption scheme with a permutation-diffusion structure. In this scheme, a Neural Network Like Structure (NNLS) is proposed to do the diffusion efficiently. The plain image, split into 16 blocks is permuted by the keys from the key generator. Each key will produce different permutation order (PO) generated using a chaotic map. After permutation, the pixels of the permuted image is converted into bits and given to the proposed NNLS, where the diffusion takes place. The bit by bit diffusion performed by NNLS on the pixels will give more randomness to the cipher image. The performance of the NNLS is contingent upon sensitivity of the keys from the key generator. The test results and analyses performed using several security standards shows that the proposed scheme is more secure, reliable and can be used for real time image encryption.

Keywords

One Round Encryption, Permutation, Diffusion, NPCR, UACI, NIST.

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R. Ranjith Kumar ¹, M. Bala Kumar ²

Affiliations
1 Department of Electronics and Communication Engineering, P.A. College of Engineering and Technology, IN
2 Department of Electrical and Electronics Engineering, Dr. Mahalingam College of Engineering and Technology, IN

Abstract

In this paper, a new loss-less symmetric image encryption using a permutation and diffusion structure is proposed. A new key generation process generates secondary keys that act as control parameter for permutation order and diffusion bit generator. The Image pixels are scrambled in bit level. Permutation order is generated using the parametric switching type that permutes the pixel in bit wise manner. In the diffusion stage the different keys were used to diffuse in each round. In the diffusion stage the image pixel bits are masked with the randomly generated binary sequence. Three chaotic systems employed to generate the secondary key, permutation order and diffusion bits. The simulation results prove the satisfactory level of security for image encryption.

Keywords

Image Encryption, Bit Wise Permutation, Logistic Map, Diffusion, Tent Map, Sine Map, Parametric Switching.

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