关键词: 混沌, 统一混沌系统, 混沌排序, 图像加密, 混淆, 扩散

Abstract: A new image encryption algorithm based on unified chaotic system is proposed.Firstly，the two chaotic sequences of the unified chaotic system are used to shuffle the positions of the image pixels in the spatial-domain.The introduces into three encrptpions assisting the secret key，differect of the three chaotic sequences of the unified chaotic system are adopted to generate bykey sequences，and the shuffled image is encrypted by pixel.The experimental and theoretical results demonstrate that the algorithm has well properties of confusion and diffusion.The key space is large enough to resist the brute-force attack.For the encrypted image the distribution of grey values has a random-like behavior and the adjacent pixels satisfy zero correlation.These results indicate that the proposed scheme has high security.

Key words: chaos, unified chaotic system, image encryption, Chaos is ordered, confusion, diffusion