非对称数字水印技术研究

Research on Asymmetric Watermark

在数字产品中嵌入数字水印,是对其进行版权保护的一种有力的手段。近年来提出了不少数字水印方案,但是它们中大部分都是对称的,即用于水印嵌入和水印检测的密钥是相同的。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。文章分析了非对称水印的基本特征,并对一些非对称方案,包括非对称水印算法和非对称水印协议进行了讨论。

Watermark technology has been developed to tackle the problem of unauthorized copying and distribution of digital data.Many different schemes have been proposed in the last few years,but most of them are symmetric,i.e.,the key used for watermarking embedding is just the same used for watermarking detection.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 wa-termark detection.This paper discusses some basic characters of asymmetric watermark,and review some asymmetric wa-termarking algorithms and asymmetric watermarking protocols.