关键词: 图像加密, 比特置换, 超混沌系统, DNA编码, DNA序列

Abstract: Digital image encryption technology is an effective means to protect digital image transmission. An image encryption algorithm based on bit permutation and DNA sequence operations is proposed in this paper. The algorithm firstly uses the Chen system to generate the chaotic map index to scramble the image pixels, and the butterfly network is used to implement the bit permutation. Then the image is coded into DNA matrix, and the algebraic operation is performed with the DNA sequence to realize the substitution of the pixels, which further improves the security of the encryption. Finally, the confusion and diffusion properties of the algorithm are further enhanced by the ciphertext feedback. Experimental results and security analysis show that the algorithm not only has a large key space, the sensitivity of the key, but also can effectively resist statistical analysis and exhaustive analysis attacks.

Key words: image encryption, bit permutation, hyper-chaos, DNA code, DNA sequence