Accession Number:

ADA465464

Title:

Tor: The Second-Generation Onion Router

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

• Dingledine, Roger
• Mathewson, Nick
• Syverson, Paul

Report Date:

2004-01-01

Pagination or Media Count:

18.0

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.

Descriptors:

• *COMMUNICATIONS NETWORKS
• WIDE AREA NETWORKS
• SECURE COMMUNICATIONS

Subject Categories:

• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE