论文设计了基于控制字的混沌图像加密方法，完善了混沌扰动模型，更好地解决了混沌加密有限精度问题。
A chaotic image encryption method based on control word is designed to improve the chaotic perturbation model and solve the finite precision problem in chaotic encryption.
接着，就混沌理论和混沌加密算法进行研究，对其中的部分算法进行了仿真，通过分析，寻找出现有混沌图像加密算法存在的一些不足。
Then, we study chaos theory and the algorithm, take a part of algorithm for simulation, find out the shortage of images encryption algorithm.
如果混沌序列某一比特位为0，则将对应的加密水印信息嵌入到待嵌入图像信息的最低比特位。
When a bit in chao sequences is equal to 0, hiding watermark information of the corresponding bit is embedded into Least Significant Bite.
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