A Method of Collecting the IP Addresses of Hidden Server in Tor Networks

Nowadays, anonymity in the Internet has attracted attention from the viewpoint of privacy protection. The Onion Router (Tor) is one of the most popular software that can anonymize the Internet communication. Tor can provide "Hidden Service" that is a web service and that keeps the anonymity for both of users and servers. This paper analyzes the communication characteristics of hidden services. Based on the results of the analysis, this paper also proposes a method of collecting IP addresses of hidden services. Furthermore, the experiment shows effectiveness of the proposed method.