The algorithms for the watermark embedding and extracting are both open, and public key cryptosystem is utilized instead of common watermark key.
水印的嵌入和提取算法都是公开的，公钥系统取代了普通的水印密钥。
Then we compute the watermark key using and and extract it.
再利用，算出水印密钥，进行水印提取。
However, in many applications it needs an asymmetric scheme, where a private key is used for watermark embedding, and a public key is used for watermark detection.
而许多实际的应用都要求非对称的数字水印方案，即水印嵌入时使用私人密钥，水印检测时只需要一个公开密钥。
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