- 期刊
A Modified ZigZag Transform Method and Its Application in Image Encryption
摘要
This paper proposes a novel image encryption algorithm based on ZigZag transform and chaotic system with the scrambling-diffusion structure. Firstly, we propose a modified ZigZag scrambling transform method to overcome the shortcomings of the traditional ZigZag transform. Secondly, the modified ZigZag scrambling method is adopted to scramble the image coefficient matrix successfully. Finally, the diffusion method is used to encrypt images to obtain the final cipher image. In addition, the SHA256 hash function value of the original image is generated to calculate the parameters for the initial values of the chaotic system, which enhances the correlation between the algorithm and the plain image and makes the proposed encryption scheme resist the plaintext attacks. Experiments are tested on three classical images. The results of simulation experiments are evaluated using the histogram, correlation analysis, entropy, number of pixel change rate (NPCR), and unified average change intensity (UACI). The experimental results show that the proposed method is practical and feasible.
延伸閱讀
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