Firstly, we design a binary image watermarking signal and encrypted it by a chaotic sequence cipher before it is embedded. 将含有版权信息的二值图像作为水印，利用混沌密码对其进行加密，水印方案具有双重的安全性。
Since the three chaotic models have different security level and structure complexity, they can be employed in various chaotic ciphers. 这三类模型具有不同的安全强度和复杂度，可满足多种安全应用环境下的混沌密码设计的要求。
