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- Title
An image encryption scheme based on block compressed sensing and Chen's system.
- Authors
Luo, Yuling; Liang, Yuting; Zhang, Shunsheng; Liu, Junxiu; Wang, Fangxiao
- Abstract
Image encryption is a common way of information protection. However, most of the existing image encryption schemes have a low transmission efficiency and large memory consumption due to ciphertext redundancy. A highly-efficient and secure image algorithm with block compressed sensing (BCS) is designed in this paper to protect image information and reduce redundant data. Firstly, the original image is sparsely processed by discrete wavelet transform (DWT), and then pixel positions in the global scope are scrambled by chaotic sequence. Secondly, several image blocks are obtained by dividing scrambled images. Then, the image blocks are measured by a key-controlled partial Hadamard matrix to reduce the dimension. Finally, image blocks are merged and a proposed randomly selected pixel diffusion (RSPD) is used to further enhance security performance and the anti-statistic analysis ability. Specifically, the SHA-512 values of the original image are used for the key generation, and then the plaintext sensitivity is improved. The pseudo-random sequences that are required for scrambling and diffusion are produced by the Chen's system and logistic map. Results show that the proposed mechanism can effectively reduce the redundant information and has a lower computational complexity and higher security performance than existing methods.
- Subjects
IMAGE encryption; DISCRETE wavelet transforms; HADAMARD matrices; COMPUTATIONAL complexity; MATHEMATICAL logic
- Publication
Nonlinear Dynamics, 2023, Vol 111, Issue 7, p6791
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-022-08119-6