Check out the new USENIX Web site.

USENIX Home . About USENIX . Events . membership . Publications . Students
13th USENIX Security Symposium — Abstract

Pp. 303–320 of the Proceedings

Tor: The Second-Generation Onion Router

Roger Dingledine and Nick Mathewson, The Free Haven Project; Paul Syverson, Naval Research Lab

Abstract

We present Tor, a circuit-based low-latency anonymous communication service. This second-generation Onion Routing system addresses limitations in the original design by adding perfect forward secrecy, congestion control, directory servers, integrity checking, configurable exit policies, and a practical design for location-hidden services via rendezvous points. Tor works on the real-world Internet, requires no special privileges or kernel modifications, requires little synchronization or coordination between nodes, and provides a reasonable tradeoff between anonymity, usability, and efficiency. We briefly describe our experiences with an international network of more than 30 nodes. We close with a list of open problems in anonymous communication.
  • View the full text of this paper in HTML and PDF.
    Click here if you have forgotten your password Until August 2005, you will need your USENIX membership identification in order to access the full papers. The Proceedings are published as a collective work, © 2004 by the USENIX Association. All Rights Reserved. Rights to individual papers remain with the author or the author's employer. Permission is granted for the noncommercial reproduction of the complete work for educational or research purposes. USENIX acknowledges all trademarks within this paper.

  • If you need the latest Adobe Acrobat Reader, you can download it from Adobe's site.
To become a USENIX Member, please see our Membership Information.

?Need help? Use our Contacts page.

Last changed: 27 July 2004 aw
Technical Program
Security '04 Home
USENIX home