分形水印检测边界的抗Oracle攻击安全性  

Security of Fractal Watermarking Detection Boundaries Against Oracle Attacks

作　　者：赵启阳[1] 尹宝林[1] 

机构地区：[1]北京航空航天大学软件开发环境国家重点实验室,北京100083

出　　处：《计算机工程》2009年第1期10-12,29,共4页Computer Engineering

基　　金：国家"973"计划基金资助项目(G1999032709)

摘　　要：对于扩频水印机制,水印检测边界的分形化是对抗Oracle攻击的一种主要方法。该文研究Oracle攻击的攻击距离对水印信号估计的影响,发现具有高检测值的攻击发起点能够有效地增强水印估计的准确性。分析和实验表明,直接从目标信号处发起的Oracle攻击能够有效地削弱检测边界分形化的影响,并且成功地去除含水印作品中的水印信号。The fractal detection boundary is an important countermeasure to the Oracle attack. The paper investigates the effect of the attacking distance between the distorted signals from which the Oracle attack starts and the detection boundaries on the accuracy of watermark estimations. Analysis and experiments show that it is more accurate to estimate the watermarks with high detection values. The Oracle attacks directly launched from the object signals can eliminate the negative effect of fractal boundaries and remove the watermarks successfully.

关 键 词：数字水印 Oracle攻击 分形检测边界 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]