基于稳健信息隐藏的半脆弱水印技术  

A Novel Semi-Fragile Watermarking Scheme Based on Robust Hidden Information

作　　者：张新鹏[1] 王朔中[1] 马小松[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2003年第3期201-205,共5页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金 (6 0 0 72 0 3 0 );上海市重点学科建设资助项目

摘　　要：半脆弱水印可以察觉对载体信息进行篡改等恶意操作,却对正常的信号处理不敏感.但是,攻击者可以通过分析嵌入了半脆弱水印的多个不同载体中的共同特点破译水印系统.为了提高安全性,该文提出了对不同的载体随机地选择不同密钥的半脆弱水印方案,其中水印数据的产生和嵌入依赖于密钥.在水印数据半脆弱地嵌入载体信息的同时,密钥也被稳健地隐藏在载体信息中.由于密钥不同,不同载体没有可用于分析的相同性质,使攻击者难于破译水印系统.此文为静止图像设计了具体的水印算法.Semifragile watermarking scheme can be used to detect hostile operation on the host data, which is insensitive to normal signal processing. However, it is possible to successfully attack a watermarking system by analyzing the common characteristics in different watermarked data containing semifragile watermark. To deal with this problem, a novel semifragile watermarking is proposed, in which different keys are randomly selected for different host data, and the generation and insertion of watermark is dependent on the selected key. While inserting the semifragile mark, the key is also robustly embedded into the host. Analyzing different pieces of watermarked data in order to launch an attack becomes impossible because of the lack of common characteristics in these pieces. A watermarking algorithm is implemented using the proposed technique for still images.

关 键 词：数字水印 信息隐藏 半脆弱 稳健 半脆弱水印 

分 类 号：TN911.73[电子电信—通信与信息系统]