一种基于双混沌序列的数字图像加密算法

提出了一种结合正弦混沌映射和Logistic映射的双混沌序列的图像加密算法。该算法首先利用正弦迭代产生混沌序列，对图像进行置乱，然后利用Logistic产生加密矩阵对图像进行异或操作。对算法的安全性和加密性能进行了分析。仿真实验结果表明:该加密算法的时间开销很小、密钥空间足以抵抗强力攻击、密文对初始密钥的微小变化有很强的敏感性，可应用于实时性较高的场合。

An Image Watermarking Encryption Algorithm Based on Dual Chaotic Map

A new chaotic encryption algorithm based on combing sine chaotic map and Logistic map is proposed. It achieves space chaos of an image with chaotic sequence generated by sine chaotic map. Then the previous encrypted image is implemented by XOR operation with encryption matrix generated by Logistic chaotic map. Some analyses regarding security and encryption have been presented as well. Simulation results show that the proposed cryptosystem requires very little time to encrypt the image and the key space is large enough to resist the brute-force attack. The encrypted image varies sensitively with the variances of the secret key. It is also appropriate for real time encryption.