Abstract
Tor is one of the most popular anonymous communication systems, and its ability of providing receiver anonymity makes hidden services more and more attractive. However, with the exposure of illegal contents such as child pornography and drug trades in hidden services, it becomes urgent to make a comprehensive analysis and evaluation of hidden services in the Tor network. In this paper, based on the frequent updates of hidden service descriptors, we proposed an approach to model Tor hidden service discovery as a generalized coupon collector problem with group drawings. Our experiments based on the real Tor network proved the efficiency and feasibility of the proposed model, which proved the possibility of harvesting most of hidden services with a small amount of resources.
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