- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | XU Changbiao, XU Haonan, MING Zhifei. Image Encryption Scheme Based on 2D Discrete Chaotic System and Deoxyribonucleic Acid[J]. Journal of Southwest Jiaotong University, 2024, 59(3): 528-538. doi: 10.3969/j.issn.0258-2724.20220810
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In order to enrich the dynamic characteristics of a low-dimensional discrete chaotic system and overcome the problem of low security of chaotic image encryption system caused by the introduction of deoxyribonucleic acid (DNA) coding, a 2D discrete chaotic system with constant positive Lyapunov exponent was constructed based on Arnold map. In addition, a chaotic image encryption scheme was designed by combining the system with DNA coding. The designed chaotic system model did not have nonlinear terms and had hyperchaotic dynamic behavior. The chaotic sequence used for encryption in the encryption scheme was the result of addition and module operation between the plaintext image pixels and the key. Images were divided into blocks by the size of 4 × 4. The operations of DNA addition and subtraction, XOR, and XNOR in the diffusion algorithm were based on DNA coding rule 1, rule 4, and rule 7, respectively. The simulation and performance analysis results show that the key space of the encryption scheme is 2266; the information entropy is 7.999 3 bit; the key sensitivity is 10−15, and the average number of pixel change rate (NPCR), unified average change intensity (UACI), and block average change intensity (BACI) are 99.609 2%, 33.466 4%, and 26.771 8%, respectively.
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