数字水印方法的安全性是基于假定嵌入和检测的算法是秘密的。它们是不方便公众审查和广泛使用。因此，需要一种可以打开的、同时安全的水印算法。类似于密码分析的十二种模型用来对数字水印的安全性进行评价。它们

用于评估拼凑水印算法和它们的弱点。-The security of digital watermarking methods is based on

the assumption that their embedding and detection algorithms are kept

secret. They are thus inconvenient for public review and widespread use.

A watermarking algorithm that can be open while remaining secure is

thus needed. Twelve models that are analogous to cryptanalysis models

are described for　uating the security of digital watermarking. They

were used to　uate the patchwork-based watermarking algorithm and

identify its weakness.