Roger Dingledine

My research on identity in dynamic networks ties together my interests in security and scalable secure systems, anonymity and pseudonymity, cryptography and unobservability, privacy, and free software advocacy.

• Publications
• Presentations
• Employment
• Projects
• Program Committees
• Teaching Experience
• Degrees

Publications

Selected peer reviewed publications:

• Roger Dingledine, Andrei Serjantov, Paul Syverson. Blending different latency traffic with alpha-mixing. Privacy Enhancing Technologies workshop (PET2006), June 2006. [pdf]
• Roger Dingledine, Nick Mathewson. Anonymity Loves Company: Usability and the Network Effect. Workshop on the Economics of Information Security, June 2006. [pdf, slides]
• Nick Feamster, Roger Dingledine. Jurisdictional Diversity in Anonymity Networks. Workshop on Privacy in the Electronic Society, October 2004. [ps]
  Nominated for Best Paper Award, PET 2005.
• Roger Dingledine, Nick Mathewson, Paul Syverson. Tor: The Second-Generation Onion Router. Usenix Security 2004, August 2004. [pdf]
  Nominated for Best Paper Award, PET 2005.
• Roger Dingledine, Vitaly Shmatikov, Paul Syverson. Synchronous Batching: From Cascades to Free Routes. Privacy Enhancing Technologies workshop (PET2004), May 2004. [pdf]
• Nick Mathewson, Roger Dingledine. Practical Traffic Analysis: Extending and Resisting Statistical Disclosure. Privacy Enhancing Technologies workshop (PET2004), May 2004. [pdf]
• Nick Mathewson, Roger Dingledine. Mixminion: Strong Anonymity for Financial Cryptography. Financial Cryptography, February 2004.
• Roger Dingledine, Nick Mathewson, Paul Syverson. Reputation in P2P Anonymity Systems. Workshop on economics of p2p systems, June 2003. [pdf]
• George Danezis, Roger Dingledine, Nick Mathewson. Mixminion: Design of a Type III Anonymous Remailer Protocol. IEEE Symposium on Security and Privacy, May 2003. [pdf, ps]
• Alessandro Acquisti, Roger Dingledine, Paul Syverson. On the Economics of Anonymity. Financial Cryptography, Jan 2003. [ps, pdf]
  Nominated for Best Paper Award, PET 2003.
• Andrei Serjantov, Roger Dingledine, Paul Syverson. From a Trickle to a Flood: Active Attacks on Several Mix Types. Information Hiding, Oct 2002. [ps, pdf]
• Roger Dingledine, Paul Syverson. Reliable MIX Cascade Networks through Reputation. Financial Cryptography, Mar 2002. [ps, pdf]
• Roger Dingledine, Michael J. Freedman, David Hopwood, David Molnar. A Reputation System to Increase MIX-net Reliability. Information Hiding Workshop, Mar 2001. [ps, pdf]
• Roger Dingledine, Michael J. Freedman, David Molnar. The Free Haven Project: Distributed Anonymous Storage Service. Workshop on Design Issues in Anonymity and Unobservability. LNCS 2009. Berkeley, July 2000. [ps]

Book chapters, manuscripts, and Thesis:

• Roger Dingledine and Nick Mathewson. "Anonymity Loves Company: Usability and the Network Effect." In Security and Usability, an O'Reilly Media book, August 2005. [pdf]
• Roger Dingledine, Michael J. Freedman, David Molnar. "Accountability Measures for Peer-to-Peer Systems." In Peer-to-Peer: Harnessing the Power of Disruptive Technologies, an O'Reilly book. Nov 2000. [html]
• Roger Dingledine, Michael J. Freedman, David Molnar. "Free Haven." In Peer-to-Peer: Harnessing the Power of Disruptive Technologies, an O'Reilly book. Nov 2000. [html]
• Roger Dingledine. The Free Haven Project: Design and Deployment of an Anonymous Secure Data Haven, MIT M.Eng. Thesis under supervision of Ronald Rivest, June 2000. [ps, pdf]

Selected Presentations

Slides, dates, and other details have been moved to my presentations page.

Employment

• President and co-founder, The Tor Project. We're a real 501(c)(3) nonprofit now! I am the president, one of the directors, and also play many other roles. Learn more about Tor.
• Owner and founder, Moria Research Labs. This is my consulting company — doing contracts and consulting for industry, government, and academia. I used to mainly do contracts for research and development on Tor, until we became a real nonprofit (above).
• Previous employment: Security Philosopher, Reputation Technologies. Reputation Technologies, Inc was a startup using reputation systems (performance tracking and prediction) to make e-commerce between businesses easier. In particular, I researched how to integrate reputation systems into peer-to-peer and other pseudonymous dynamic systems to provide security and accountability.
• Other previous employers include the MIT network security team, National Security Agency, a graphics supercomputer startup called Integrated Computing Engines (ICE), and Emory University.

Projects

• Project leader, Tor. Tor is the second-generation Onion Routing system: it provides a TCP-based anonymizing overlay network. Tor addresses many limitations in the original Onion Routing design, and is released unencumbered as free software.
• Mixminion. The Mixminion Project is designing and building a message-based anonymous remailer protocol to replace the old Mixmaster network. Mixminion provides secure single-use reply blocks (Mixmaster provides no support for replies, instead relying on the older and less secure Cypherpunk remailers), and introduces nymservers that allow users to maintain long-term pseudonyms using single-use reply blocks.
• Project leader, Free Haven. The Free Haven Project aims to deploy a system for distributed, anonymous, persistent data storage which is robust against attempts by powerful adversaries to find and destroy any stored data. We emphasize anonymity (publisher, reader, server), accountability (reputation and micropayment schemes), persistence (publisher-specified document lifetimes), and flexibility (peers can dynamically join or leave). I've also been working on an anonymity bibliography.
• Project leader, SEUL. The Simple End-User Linux (SEUL) Project is a large organization trying to guide many other groups in making Linux better for the end-user. The end goal of SEUL is to have a comprehensive suite of high-quality applications (productivity applications as well as leisure/programming applications) available under the GPL for the Linux platform, as well as a broader base of educated users around the world who understand why free software is better.

Program Committees

• Program chair: Financial Cryptography and Data Security '09, Barbados, 2009.
• Program committee: Workshop on Privacy in the Electronic Society (WPES 2008). Alexandria, VA, October ??, 2008.
• Program committee: Symposium on Usable Privacy and Security, Pittsburgh, PA, July 23-25, 2008.
• Program committee: 8th Privacy Enhancing Technologies Symposium, Leuven, Belgium, July 23-25, 2008.
• Program committee: 2007 ACM Conference on Computer and Communication Security (CCS), Alexandria, VA, October 29-November 2, 2007.
• Program committee: Workshop on Privacy in the Electronic Society (WPES 2007). Alexandria, VA, October 29, 2007.
• Program committee: 7th Privacy Enhancing Technologies Symposium, Ottawa, Canada, June 20-22, 2007.
• Program committee: 2007 ACM Symposium on InformAtion, Computer and Communications Security (ASIACCS'07), Singapore, March 20-22, 2007.
• Program committee: Financial Cryptography and Data Security '07, Trinidad/Tobago, February 12-15, 2007.
• Program committee: The Second International Workshop on Dependable and Sustainable Peer-to-Peer Systems (DAS-P2P 2007), Hiroshima, Japan, January 15-19, 2007.
• Program chair: Workshop on Privacy in the Electronic Society (WPES 2006). Alexandria, VA, October 30, 2006.
• Program committee: 6th Workshop on Privacy Enhancing Technologies (PET 2006). Cambridge, England, June 28-30, 2006.
• Program committee: The First International Workshop on Dependable and Sustainable Peer-to-Peer Systems (DAS-P2P 2006). Vienna, Austria, April 20-22, 2006.
• Program committee: The First International Conference on Availability, Reliability and Security (AReS 2006). Vienna, Austria, April 20-22, 2006.
• Program chair: Workshop on Privacy in the Electronic Society (WPES 2005). Alexandria, VA, November 7, 2005.
• Program committee: 5th Workshop on Privacy Enhancing Technologies (PET 2005). Dubrovnik, Croatia, May 30-June 1, 2005.
• Program committee: Financial Cryptography and Data Security (FC05). Roseau, Dominica, February 28-March 3, 2005.
• Program committee: Workshop on Privacy in the Electronic Society (WPES 2004). Washington, DC, October 28, 2004.
• Program committee: 2nd Workshop on Economics of Peer-to-Peer Systems. Cambridge, MA, June 4-5, 2004.
• Program committee: 4th Workshop on Privacy Enhancing Technologies (PET 2004). Toronto, Canada, May 26-28, 2004.
• Program committee: Security and Privacy track, Thirteenth International World Wide Web Conference (WWW 2004). New York City, May 17-22, 2004.
• Program committee: Financial Cryptography (FC04). Key West, FL, February 9-12, 2004.
• Program committee: Workshop on Privacy in the Electronic Society (WPES 2003). Washington, DC, October 30, 2003.
• Program committee: Workshop on Economics of Peer-to-Peer Systems. Berkeley, CA, June 5-6, 2003.
• Program committee: Security and Privacy track, Twelfth International World Wide Web Conference (WWW 2003). Budapest, Hungary, May 20-24, 2003.
• Program chair: 3rd Workshop on Privacy Enhancing Technologies (PET 2003). Dresden, Germany, March 26-28, 2003.
• Program committee: CodeCon 2003. San Francisco, CA, February, 2003.
• Program committee: Workshop on Privacy in the Electronic Society (WPES 2002). Washington, DC, November 21, 2002.
• Program chair: 2nd Workshop on Privacy Enhancing Technologies (PET 2002). San Francisco, CA, April 14-15, 2002.
• Program committee: The 1st International Workshop on Peer-to-Peer Systems (IPTPS02). MIT Faculty Club, Cambridge, MA, March 7-8, 2002.

Teaching experience

• Introduction to Algorithms (6.046). Teaching assistant (including weekly recitations) for Professors Silvio Micali and Shafi Goldwasser. Spring 2000.
• Computer and Network Security (6.857). Teaching assistant for Professor Ronald Rivest. Designed and graded problem sets, taught a lecture. Fall 1999.

Degrees