Mixminion: Design of a Type III Anonymous Remailer Protocol

  • Authors:
  • George Danezis;Roger Dingledine;Nick Mathewson

  • Affiliations:
  • -;-;-

  • Venue:
  • SP '03 Proceedings of the 2003 IEEE Symposium on Security and Privacy
  • Year:
  • 2003

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Abstract

We present Mixminion, a message-based anonymous remailerprotocol with secure single-use reply blocks. Mixnodes cannot distinguish Mixminion forward messages fromreply messages, so forward and reply messages share thesame anonymity set. We add directory servers that allowusers to learn public keys and performance statistics of participatingremailers, and we describe nymservers that providelong-term pseudonyms using single-use reply blocksas a primitive. Our design integrates link encryption betweenremailers to provide forward anonymity. Mixminionworks in a real-world Internet environment, requires littlesynchronization or coordination between nodes, and protectsagainst known anonymity-breaking attacks as well asor better than other systems with similar design parameters.