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nsa research paper on tor network (2006)

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TOP SECRET//COMINT//20291123 (U//FOUO) Tor 2006 CES Summer Program Abstract (U) Tor is an open-source anonymization program created by Roger Dingledine, Nick Mathewson, and Paul Syverson. Originally sponsored by the US Naval Research Laboratory, and now backed by the Electronic Frontier Foundation, it routes a user’s traffic through several servers in a way that hides the user’s location. (TS//S I) We hav e seen sev eral targets using Tor. Our goal was to analyze Tor source code and determine any vulnerabilities in the system. We set up an internal T or net wor k to analyze Tor traffic, in the hopes of disco ve ring wa ys to passi ve ly identify it. We also worked to create a custom Tor client which allows the user finer control. Contents 1 (U) Tor overview 3 2 (U//FOUO) Objectives 4 3 (U//FOUO) Objectives 1 and 2 4 4 (U//FOUO) MJOLNIR 4 4.1 (U//FOUO) Building circuits . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2 (U//FOUO) Sending and receiving data . . . . . . . . . . . . . . . . . . . 6 4.3 (U//FOUO) MJOLNIR GUI for Windows . . . . . . . . . . . . . . . . . . 7 5 (S//SI) Tor’s X.509 certificates 8 5.1 (S//SI) MJOLNIR’s X.509 certificates . . . . . . . . . . . . . . . . . . . . 8 6 (U) Tor’s hidden services 10 7 (U//FOUO) Possible attacks 10 7.1 (T S/ /SI) De ni al -of- se rvice-st yl e at ta cks wi th MJOLNIR . . . . . . . . . . 11 7.1.1 (TS//SI) Coil attack . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.1.2 (TS//SI) Flower attac k . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2 (U//FOUO) Traffic analysis . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2.1 (U) A basic Tor circuit . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2.2 (S//S I) Locating known hidden services . . . . . . . . . . . . . . . 15 7.3 (S//SI) Discov ering unk nown hidde n services . . . . . . . . . . . . . . . . . 16 7.4 (U//F OUO) Man-in-the-middle attack . . . . . . . . . . . . . . . . . . . . 17 1 TOP SECRET//COMINT//20291123

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