Abstract
The strength and effectiveness of a chaotic image cryptosystem are closely related to the complexity of the used chaotic maps. This paper first introduces an enhanced chaotic model called Arc Cotangent and Cotangent Chaotic Model (ACCCM) to generate improved chaotic properties. Dynamical analysis indicates that the enhanced systems exhibit an extensive chaotic range, unpredictable orbit and uniform outputs. In order to improve the strengths and efficiency of encryption, this paper presents a novel image encryption scheme. The scheme consists of a new sequence generator, Rubik’s permutation, and row-wise diffusion. Firstly, the sequence generator is utilized to generate a short keystream for encryption process, where the total keystream only requires 12/m of image size. This module can effectively reduce computational costs and counteract dynamical degradation. Secondly, the permutation phase can randomly break the high spatial correlation by rotating different sections of Rubik’s cube. To further accelerate execution speed while ensuring sufficient security, a row-wise diffusion with random selection is performed to modify pixel values efficiently. Security analysis shows that the scheme has the advantages of high security level and fast running speed. Considering images with a size of 256 × 256, our scheme processes images in real-time at 83 frames per second. This indicates that it is well suited for real-time image encryption tasks.
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Zhao, H., Xie, S. & Zhang, J. Fast image encryption based on new cascade chaotic system and Rubik’s cube strategy. Multimed Tools Appl 83, 45653–45692 (2024). https://doi.org/10.1007/s11042-023-16936-z
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DOI: https://doi.org/10.1007/s11042-023-16936-z