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Open AccessArticle

A Secure and Fast Image Encryption Scheme Based on Double Chaotic S-Boxes

School of Computer Science, University of South China, Hengyang 421001, China
School of Computer Science, Guangzhou University, Guangzhou 510006, China
School of Computer Science and Engineering, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Entropy 2019, 21(8), 790;
Received: 22 July 2019 / Revised: 7 August 2019 / Accepted: 12 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Entropy in Image Analysis II)
PDF [5469 KB, uploaded 20 August 2019]


In order to improve the security and efficiency of image encryption systems comprehensively, a novel chaotic S-box based image encryption scheme is proposed. Firstly, a new compound chaotic system, Sine-Tent map, is proposed to widen the chaotic range and improve the chaotic performance of 1D discrete chaotic maps. As a result, the new compound chaotic system is more suitable for cryptosystem. Secondly, an efficient and simple method for generating S-boxes is proposed, which can greatly improve the efficiency of S-box production. Thirdly, a novel double S-box based image encryption algorithm is proposed. By introducing equivalent key sequences {r, t} related with image ciphertext, the proposed cryptosystem can resist the four classical types of attacks, which is an advantage over other S-box based encryption schemes. Furthermore, it enhanced the resistance of the system to differential analysis attack by two rounds of forward and backward confusion-diffusion operation with double S-boxes. The simulation results and security analysis verify the effectiveness of the proposed scheme. The new scheme has obvious efficiency advantages, which means that it has better application potential in real-time image encryption.
Keywords: image encryption; compound chaotic system; S-box; image information entropy image encryption; compound chaotic system; S-box; image information entropy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhu, S.; Wang, G.; Zhu, C. A Secure and Fast Image Encryption Scheme Based on Double Chaotic S-Boxes. Entropy 2019, 21, 790.

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