基于二次剩余理论的软件版权保护

Software Copyright Protection Based on Quadratic Residue

为了提高动态图水印的鲁棒性,采用基数循环链表分别与二叉树结构和PPCT结构相结合对水印信息进行编码。水印信息的产生基于二次剩余理论和Rabin密码体制,该算法在多个水印与宿主程序之间建立功能性的依赖关系,对真实水印起到防篡改的作用,增加了攻击难度,从而可对该类水印进行有效保护。

In order to improve the robustness, the watermark data is encoded by radix-K linklist which integrates with binary tree and Planted Plane Cubic Tree（PPCT） respectively, The generation of watermark information is based upon quadratic residue theory and Rabin cipher system. The functionality dependency relationship is built between multiple watermark and host programs. The true watermarks are protected against tampering. It increases the attacking difficulty, and the watermark can be efficiently protected.