计算机应用 ›› 2005, Vol. 25 ›› Issue (11): 2547-2548.
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摘要: 运用级联码的思想提出了一种抗两用户合谋攻击的指纹设计方法和与其对应的跟踪方法。编码算法中内码采用文献[4]构建的一种新的两用户合谋安全码,外码采用q进制随机数,减小了编码的难度。设计了跟踪算法验证了这种编码算法的有效性。该算法在用户数增加、码字长度不变的情况下,仍能有效跟踪到至少一个合谋用户,克服了以往码字过长的缺点。
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