基于非对称水印的侵权取证方法研究

Research onTort Forensics Method Based on Asymmetric Watermarking

在数字图像的侵权优化取证的研究中,数字图像的加密预处理的加密方法直接关系到后续侵权取证的成功率。对称水印机制需要暴露密钥而易受攻击,传统的对称水印的侵权取证方法因易受攻击,存在取证成功率不高的问题。为了解决上述问题,提出了基于非对称水印的侵权取证方法。对图像加密预处理加密时采用非对称水印嵌入对数字图像进行版权保护,因其在水印提取时密钥不需暴露出来,能够有效抗攻击保护侵权证据,避免了传统方法易受攻击影响的不足,通过完整地提取出侵权图像中的数字水印特征信息,并利用LSH聚类算法最终完成侵权证据的提取,保证了侵权取证的成功率。仿真结果表明,改进方法能够将侵权证据有效提取出来,具有较高的取证成功率,取得了满意的结果。

In the study of digital image tort forensics optimization,the encryption method of digital image encryption pretreatment is directly related to the success rate of follow-up tort forensics.Symmetric watermarking mechanism needs to expose the key and vulnerable,the traditional method of the symmetric watermarking tort forensics is vulnerable,and so the success rate of tort forensics is not high.In order to solve this problem,a method of the tort forensics based on asymmetric watermark was presented.It made use of asymmetric watermarking embedding for digital image copyright protection in image encryption pretreatment,because of keys without exposed in the extraction of watermark.It can effectively resist the attacks to protect evidence of infringement and to avoid the insufficient of the traditional method vulnerable effects,by integrally extracting the digital watermark characteristic information in tort images and making use the clustering algorithm of LSH.Finally,it completed the tort evidence extraction to ensure the success rate of infringement evidence.The simulation results show that the improved method can effectively extract the evidence of infringement with high success rate of forensics and satisfactory results.