Abstract
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.
Highlights
With the rapid development of network communication, image encryption has become a research hotspot in the field of image processing and information security
Chaos-based cryptosystem just meets the need of image encryption, which leads to the research of chaos-based image encryption technology has been widely concerned by scholars
Cryptanalysis [14,15,16] is another important research direction of cryptography, which can help cryptographic designers improve the security of cryptographic algorithms
Summary
With the rapid development of network communication, image encryption has become a research hotspot in the field of image processing and information security. Since image information has the characteristics of large amounts of data, strong redundancy and high correlation between adjacent pixels, image encryption algorithms need high security, and fast encryption speed. Chaos-based cryptosystem just meets the need of image encryption, which leads to the research of chaos-based image encryption technology has been widely concerned by scholars. How to generate key stream or encryption component with good performance is very important to the security of the image Cryptosystem [10,11,12]. How to design encryption algorithm is the core research content of the image Cryptosystem [13]. Cryptanalysis [14,15,16] is another important research direction of cryptography, which can help cryptographic designers improve the security of cryptographic algorithms
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