一个基于DCT压缩编码的多媒体认证系统  

A DCT-BASED MULTIMEDIA AUTHENTICATION SCHEME

作　　者：李德全[1] 苏璞睿[1] 冯登国[1] 

机构地区：[1]中国科学院软件研究所信息安全国家重点实验室,北京100080

出　　处：《计算机研究与发展》2002年第6期678-683,共6页Journal of Computer Research and Development

基　　金：本课题得到国家"九七三"重点基础研究发展规划项目(G1999035802);国家杰出青年基金项目(60025205)资助

摘　　要：多媒体的认证是近年来随着Internet的发展而提出来的一个新问题.与消息认证类似,多媒体认证用于确认多媒体数据的来源并检测是否被篡改.其虽可用传统的方法即密码学上的数字签名来实现,但数字签名用于多媒体认证有其局限性.脆弱水印为多媒体的认证提供了较好的解决方案.目前已经有了各种不同的脆弱水印算法,但这些算法都有它们各自的优缺点.在对Marvel等的方法（以下称其为MHB法）进行成功的攻击之后,通过对MHB法的修正与扩展,给出了一种更安全的、能抵抗基于DCT的压缩的脆弱水印算法.通过实验还证明了以像素值或其高位比特产生MAC的数字水印不能抵抗基于DCT的压缩.Multimedia authentication is a problem posed to the world along with the development of Internet recently. Similar to message authentication, multimedia authentication is used to authenticate the source and to detect manipulation. This could be achieved by cryptographic digital signature. However, digital signature has some disadvantages to this end. Fragile watermark renders itself useful in this domain. There exist several fragile watermark schemes in the literature and all have their own cons and pros. After a successful analysis of the fragile watermark scheme presented by Marvel et al. , a new fragile watermark scheme robust to DCT-based compression is presented,which is an extension of and much safer than the one of Marvel et al. . Experiments show that a digital watermark scheme which use pixel values or significant bits of pixel values as input of MAC could not resist DCT-based compression.

关 键 词：DCT 压缩编码 数字水印 信息隐藏 图像处理 多媒体认证系统 INTETNET 网络安全 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术]