Abstract: Due to the constant initial parameters, the performance of the chaotic system is weak, and the combination of encryption chaotic source sequence is single. Therefore, a Strcmp sequence decomposition method based on mathematical logic inversion is proposed. It combines hyperlorenz chaotic system to set up the entropy feedback mechanism of ciphertext, and resets the chaos generator several times. The decomposed sequence is used to optimize the image block scrambling, and add and extract mode diffusion encryption. Simulation experiment shows that the decomposition sequence has good randomness. The NPCR value of the simulation object is 99.62%, the UACI value is 33.48%, and the entropy value is 7.9994, which was better than other combined source sequence algorithms. Besides, the algorithm also has good encryption effect on special images. Therefore, it can effectively resist the selected plaintext attacks.

Key words: logical inversion, Strcmp decomposition, block, entropy feedback of ciphertext, image encryption