基于水印技术的多媒体认证系统模型研究

Study on theory mode of watermarking based multimedia authentication system

在Bran Chen提出的广义认证信息论模型的基础上,将水印认证的方法看作广义模型的特例来研究,由此提出了水印认证的信息论一般模型.首先,阐述了多媒体认证问题的一些相关基本概念.其次,在以知觉相似度函数来度量水印失真的前提下,给出了一个安全的、鲁棒的在失真条件限制下的水印认证系统可以渐近获得的条件.最后,以对策论的思想分析了认证系统攻守双方的博弈关系;并且进一步指出了水印认证系统建模和水印建模的区别和联系.

On the basis of generalized authentication model proposed by Bran Chen etc, the watermarking based authentication method is considered as a special case and accordingly a general information-theoretic model of the watermarking authentication problem is proposed. Firstly, some related basic conceptions are explained. Then, a condition that a secure and robust watermarking authentication system can be asymptotically achieved is given, which is constrained by certain distortion pairs as well as the perceptual similarity function. Finally, the relation between the authenticator and the attacker is analyzed using the game theory, and additionally the relation and difference between the watermarking authentication model and the watermarking model are pointed out.