Martin Mulazzani at PETS2014
Martin Mulazzani presented the paper on malicious Tor exit relays at PETS2014 in Amsterdam.
Core contribution of the paper are two modular exit relay scanners which can detect various MitM attacks and passive credential sniffing attacks, namely exitmap and HoneyConnector. You can find the slides here. Details and the links to the source code repositories of the scanners can be found here.
Media coverage: ThreatPost WIRED Ars Technica LWN