关键词: 超混沌系统, 高级加密标准（AES）, 图像加密

Abstract: Aiming at the disadvantages of traditional AES（Advanced Encryption Standard） encryption algorithms, such as key space is small and fixed, a new hyper-chaotic system and AES combined with image encryption algorithm are proposed. Firstly, the hyperchaotic sequence is generated by hyperchaotic Qi system, and the chaotic sequence is intercepted as the target key of AES encryption algorithm. The mean value of plaintext image pixels is introduced as a parameter to adapt to the change of plaintext image. Then, the target key is substituted into the AES encryption algorithm for two cycles of encryption, and the S-boxes and round keys in each round of encryption are generated by chaotic sequences, which enhances the key randomness. Simulation results show that the algorithm can well combine the advantages of both to achieve a very good encryption effect.

Key words: hyperchaos system, Advanced Encryption Standard（AES）, image encryption