本文首先对匿名性进行分析,确定用匿名度来衡量系统受到攻击时的匿名性。接着,从攻击者攻击系统的角度,以基于重路由技术的匿名系统为例,采用概率论的方法,建立基于概率论的发送者匿名性度量模型,得到发送者匿名度函数,并进行实例分析,得到攻击能力的提高、路径长度和攻击者观测的次数的增加均能降低匿名度的结论。 This article first analyzes the anonymity, and determines the anonymity to measure the anonymity of the system when it is attacked. Then, using the anonymity system based on rerouting technology as an example, this paper uses probability theory to establish a sender-anonymity measurement model based on probability theory, obtains the sender’s anonymity function, and carries out an example analysis , The increase of attack ability, the length of path and the increase of the number of attacker’s observation can reduce the conclusion of anonymity.