Bit-level image encryption algorithm based on random-time S-Box substitution
School of Mathematical Sciences, University of Jinan, 250022, Jinan, Shandong, China
Accepted: 15 July 2022
Published online: 4 August 2022
To solve the shortcomings of traditional cryptography such as 3DES, AES and SM4 in encrypting multimedia information, we proposed a bit-level image encryption algorithm based on chaos and S-Box. First, we constructed a 3D discrete memristor-based chaotic map (3D-MCM), which is hyperchaotic, and has ergodicity and better randomness in a larger parameter interval, then based on it, we constructed three S-Boxes with larger key space and without weakness. Furthermore, we applied the 3D-MCM and S-Boxes to design an encryption algorithm, whose novelty is that each half-pixel is substituted with a half-pixel substitution box (HPS-Box) before S-Box substitution with random times. Experimental and security analysis results demonstrated the effectiveness of the proposed 3D-MCM and S-Box in image encryption scheme.
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