Abstract
This paper presents an efficient and secure chaotic S-Box based image encryption algorithm. Firstly, by cryptanalyzing a multiple chaotic S-Boxes based image encryption algorithm, we successfully cracked the cryptosystem by using chosen-plaintext attack (CPA). Secondly, we put forward a new image encryption scheme based on a novel compound chaotic map and single S-Box. In the new scheme, a novel discrete compound chaotic system, Logistic-Sine system (LSS), is proposed, which has wider chaotic range and better chaotic properties. And a new S-Box is constructed by using LSS, which has satisfactory cryptographic performance. Based on the new S-Box and the chaotic key stream, the new image encryption algorithm is designed, which consist of a round of permutation and two rounds of substitution process. The permutation and substitution key sequences are related to the plaintext image content, this strategy enables the cryptosystem to resist CPA. The simulation results and security analysis verified the effectiveness of the proposed image encryption scheme. Especially, the new scheme has obvious efficiency advantages, showing that it has better application potential in real-time image encryption.
Highlights
With the rapid development of network communication and big data applications, information security has become a very important hot issue
Based on the security analysis of an image encryption algorithm using chaotic S-Boxes, an efficient new image encryption scheme based on chaos and single S-Box is proposed
A strong S-Box is constructed by using the new chaotic system, and the cryptographic strength of the proposed S-Box is tested
Summary
With the rapid development of network communication and big data applications, information security has become a very important hot issue. In order to contribute the cryptanalysis studies and improvement of future schemes, this paper analyzes a recently proposed image encryption algorithm based on three S-Boxes generated with a 3D continuous time chaotic system without equilibrium [26]. THE NEW COMPOUND CHAOTIC MAP AND THE CONSTRUCTION OF S-BOX Compared with continuous time chaotic systems, discrete chaotic maps have the following advantages [36]: their mathematical structure is simpler, they can generate chaotic sequence at a faster speed, and they are easier to implement with hardware. In order to improve the time efficiency of image encryption system, our new S-Box based image encryption algorithm employs a discrete compound chaotic map, and only one single S-Box and one chaotic sequence are generated by the new proposed discrete compound chaotic map.
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