Digital image scrambling technology is one of the important means of image information hiding and camouflage. Based on the classic Vigenère cipher theory, this paper proposes a digital image grayscale scrambling method and gives the algorithm flow of digital image scrambling using this method. Simulation experiments and results show that the similarity between the image histogram scrambled by this method and the histogram of the white noise image is about 0.9, which verifies the effectiveness of this method. By discussing the security performance and comparing the results with the improved Grey coding grayscale scrambling method, it is proved that this method has good practicality. Keywords: digital image scrambling; grayscale scrambling; Vigenère cipher
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