基于扩展门限的软件水印研究与实现  

Research and Implementation of Software Watermark Based on Expanded Threshold

作　　者：欧阳康[1] 张汗灵[1] 

机构地区：[1]湖南大学计算机与通信学院,长沙410082

出　　处：《计算机工程》2011年第13期135-138,共4页Computer Engineering

基　　金：长沙市科技计划产学研合作基金资助项目(K0803106-11)

摘　　要：AB算法的门限方案原本用于密钥分存,不限制子密钥的强度,从而导致水印数据扩张,而扩展门限定义可限制子密钥的数据位宽。为此,提出基于扩展门限的水印算法,采用动态图方法在Java平台实现水印系统。实验结果证明,该水印算法能有效控制水印数据扩张,加快水印恢复速度,适于构建方便实用的软件水印系统。Asmuth-Bloom（AB） algorithm is a robust software watermark algorithm based on threshold scheme,which is originally used to secret sharing,so there is no restriction on sub-key’s length.With an expanded threshold scheme,sub-key’s length can be reduced.A new algorithm based on expanded threshold is proposed.Moreover,a new watermarking system is implemented on the Java platform by using dynamic graph.Experimental results show that the proposed method can reduce the data expansion,and make the recovery process easier.The conditions above mentioned are suitable for practicalized watermark system

关 键 词：软件水印 动态图水印 防篡改 密钥分存 鲁棒性 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术]