To overcome finite word length effects and improve its resistance to the attack of crypt analysis, a chaotic map as a private key is added to the existing chaotic watermarking systems.

• 该方法在现有的混沌数字水印系统基础上 ,增加一个混沌映射作为私有密钥来克服有限字长效应和提高算法的抗破译性。