Abstract: A new chaotic encryption algorithm based on combining Logistic map and Mix Optical Bistability（MOB） model is proposed.The chaotic sequences of the Logistic maps and MOB are adopted to generate key sequences for the image encryption，respectively.The cryptosystem is further made robust against any reasonable attack by using the feedback technique.Simulation results show that the proposed cryptosystem requires very little time to encrypt the plaintext.The key space is large enough to resist the brute-force attack.The chiptext varies sensitivly with the variances of the secret key and the plaintext.For the encrypted image the distribution of pixel-values have a radom-like behavior and the values of adjacent pixels satisfy zero correlation，showing that the proposed scheme is of high security.

摘要： 提出了一种结合Logistic映射和混合光学双稳模型的对混沌图像加密算法。由Logistic映射和混合光学双稳模型产生的混沌序列分别用来产生图像加密密钥，利用反馈技术增强抵抗各种密码攻击的鲁棒性。仿真结果表明，该密码系统的时间开销很小、密钥空间足以抵抗强力攻击、密文对明文或初始密钥的任何微小变化均有强烈敏感性、密文分布均匀、相邻像素满足零相关性。故该密码系统具有高安全性。