Image Encryption Based on Hash Table Scrambling and DNA Substitution

Abstract

This paper proposes an image encryption algorithm based on hash table structure scrambling and DNA substitution. The algorithm uses the classical 'scrambling-diffusion' process, and the pseudo-random sequence used in each process is generated by the hyper-chaotic Chen system. Firstly, in the process of scrambling, two sequences with no repeated values are constructed by using the closed hash method in the hash table structure for chaotic sequences, and the plain image is scrambled twice according to the two sequences. Then, in the process of diffusion, DNA coding and decoding rules and DNA substitution rules are made according to the chaotic sequences. The image is dynamically encoded, substituted and decoded with DNA. In this way, while modifying the gray value of image pixels, it also destroys the strong correlation between adjacent pixels. Through a series of verifications, it is concluded that the algorithm not only has good encryption effect, high security and large key space, but also has the advantages of high key sensitivity and strong anti-attack capability. INDEX TERMS Hash table, DNA substitution, hyper-chaotic system, image encryption. XINGYUAN WANG received the Ph.D. degree in computer software and theory from Northeast University, China, in 1999. From 1999 to 2001, he was a Postdoctoral Researcher with Northeast University. He is currently a Professor of information science and technology with Dalian Maritime University, China. He has published three books and more than 400 scientific articles in refereed journals and proceedings. His research interests include nonlinear dynamics and control, image processing, chaos cryptography, systems biology, and complex networks. LIN LIU received the bachelor's degree from the School of Information and Electrical Engineering, Ludong University, China. She is currently pursuing the master's degree in computer technology with Dalian Maritime University, China. Her main research interests are in chaotic encryption and image processing.

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A novel DNA-based key scrambling technique for image encryption

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Chaotic Image Cryptography Systems: A Review

“…This system was designed for four sections: pixel-level diffusion, pixel-level permutation, DNA level diffusion, and the second permutation. An image encryption technique depending on the framework of the hash table scrambling and DNA replacement is suggested in [43]. The algorithm uses the classic process of 'scramblingdiffusion', and the hyper-chaotic Chen.…”

“…Examples of these techniques are: a. DNA and Chaotic Map: We note that these studies [22], [23], [25], [29], [30], [42], [43], and [46] merged the chaotic map and DNA. The combination measures were relatively better due to its dependence on the randomness of chaotic sequences and on the scrambling of values using DNA codes, which provided a suitable behaviour to isolate the values and change them in a simple way to strengthen its randomness.…”

“…2020 [38], [39], [40], [41], [42], [43], [44] Continuing work on creating new or hybrid chaotic keys and combining them with previously known or new technologies, and a great interest in generating the keys with the hash function technology.…”