摘要： 基于统计暴露攻击的原理，提出了在确定和不确定通信对象个数情况下的统计暴露攻击算法，分析了算法中的显著性因子对攻击有效性和攻击轮数的影响。在此基础上，提出了发送者掩护和背景干扰两种防范统计暴露攻击的填充包策略。模拟测试结果表明，两种策略能有效地提高攻击所需的轮数、降低攻击的准确性。

关键词: 匿名通信, 暴露攻击, 统计暴露攻击

Abstract: Based on the principle of statistical disclosure attack, this paper presents the statistical disclosure algorithm under the conditions which the communication object number is determined both undetermined. It also analyses the influence of apparent metric on the validity and attack rounds of statistical disclosure. Meanwhile, two protective strategies-sender cover strategy and background disturbance strategy are proposed to guard against statistical disclosure attack. The simulation results show that the two strategies effectively raise the attack rounds and decrease the attack accuracy.

Key words: Anonymous communication, Disclosure attack, Statistical disclosure attack