摘要
提出一种基于代码加密的防篡改软件水印方案,并对隐藏水印信息的PPCT结构进行改进.水印嵌入过程中,利用秘密分享方案,对代表版权信息的大数进行分割,以提高水印信息的隐蔽性.通过修改软件的源代码和目标代码实现水印的嵌入过程,根据特定的策略对部分目标代码进行加密,并提高加解密密钥与程序自身的关联聚合度,从而增强软件水印的鲁棒性以及防篡改能力.
Utilizing a modified PPCT structure,a tamper-proof software watermark solution with code-based encryption was proposed.The general Chinese remainder theorem was exploited to split the watermark which was represented as a big number into pieces to enhance stealthiness.Changes to the source and object code were made to embed the watermark,and according to certain policies some parts of the object code was encrypted with an en/decryption key that was highly coupled with the object code to increase robustness and tamper-proof capability.
基金
国家自然科学基金(61070176)
陕西省科技攻关项目(2011K06-07)
陕西省教育厅产业化示范项目(2010JC24,2010JC25)
西北大学研究生创新基金(09YZZ62,10YZZ16)资助
关键词
软件水印
动态图水印
广义中国剩余定理
代码加密
防篡改
software watermark
dynamic graph
general Chinese remainder theorem
code encryption
tamper-proof
