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Simulates the initiation of a Tor connection.
Home Page: http://www.cs.kau.se/philwint/gfc/
License: GNU General Public License v3.0
This project forked from nullhypothesis/tcis
Simulates the initiation of a Tor connection.
Home Page: http://www.cs.kau.se/philwint/gfc/
License: GNU General Public License v3.0
tcis is short for ``Tor Connection Initiation Simulator''. The tool partially simulates the initiation of a Tor connection to a given IP address by sending a TLS client hello containing the Tor cipher list (see [1]). After that, the program terminates. The TLS client hello is hardcoded into the program and in order to make the client hello appear like a real Tor connection, dynamic fields such as the timestamp, the random value and the host name are initialized when the program is started. The tool is useful for analyzing the Great Firewall of China which is known to search for the Tor cipher list and launches active scanning after a cipher list was detected in a connection. To run the program, you need to specify an IP address and a port where a TCP daemon is listening. It does not have to be a Tor process. A simple ``nc -l -p 1234'' is enough. $ make $ ./tcis <IP> <port> [1] https://trac.torproject.org/projects/tor/ticket/4744
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