Abstract
A hybrid image approximate encryption scheme is proposed in this paper. Replacing the full original image with the approximate reconstructed image, the encryption scheme is carried out in the pattern of diffusion, scrambling, and the nonlinear transformation of matrices. A chaotic map with multiple parameters, Gaussian function, and a nonlinear transformation of matrices are composited to form the cryptosystem. Meanwhile, multiple tools and techniques such as dot operation of matrices, random matrix, and sequence rearrangement, etc., are composed to support the scheme. Statistical analysis of the cipher randomness is carried out in the light of international standard SP800 R1a to verify the cryptosystem security, and the encryption simulations are implemented to test the algorithm feasibility and effectiveness. Furthermore, some performance indexes, including key space, key sensitivity, statistical properties, and differential analysis, etc., are taken into account to evaluate the security and robustness of the algorithm. The main contributions of our work includes: different from most full encryption methods, our algorithm is oriented to encrypt the key information of the images; a novel chaos with multiple parameters and Gaussian membership function are introduced to generate the cipher; multiple nonlinear methods are used to implemented the plaintext related technique; the security of the cryptosystem are strictly test by the randomness universal standard. Since the proposed algorithm demonstrates local advantages over the classical ones, it is expected to be applied in practical image encryption.
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Liang, X., Tao, L. & Hu, B. Image bit planes approximate reconstruction and encryption based on Gaussian function and multiple parameters chaos. Multimedia Systems 29, 305–321 (2023). https://doi.org/10.1007/s00530-022-00994-8
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DOI: https://doi.org/10.1007/s00530-022-00994-8