结合数字签名和数字水印的多媒体认证系统

探讨了基于数字签名的多媒体信息认证系统的身份认证机制和内容认证机制,分析了其基本构成以及安全性和存在的安全缺陷,提出了一种结合数字签名和数字水印的多媒体信息认证方案.系统采用双重身份认证机制和易碎水印内容认证机制,使得非法接触以及修改、伪造多媒体信息的内容都是不可能的.分析表明,该多媒体信息认证方案具有安全性强、可信度高、认证精度高等特点.

A Multimedia Authentication System Combining Digital Signature and Digital Watermarking

In this paper, the issues of entity authentication and content authentication mechanism of the digital signature based on multimedia system are addressed. Based on the analysis of the security gap in the authentication mechanism using digital signature, a novel authentication protocol combining digital signature and fragile watermarking are proposed. Double entity authentication based on digital signature and content authentication base on fragile watermarking is achieved. Illegal access to system, edition, and forgery of multimedia document is proven to be impossible. According to the analysis, the security, creditability, and authenticity are achieved.