Constitutes the refereed post-proceedings of the 7th International Symposium on Privacy Enhancing Technologies, PET 2007, held in Ottawa, Canada, in June 2007 in conjunction with WOTE 2007, the IAVoSS Workshop on Trustworthy Elections. This book presents 16 revised full papers that were selected from 84 submissions during two rounds of reviewing.

Attacking Unlinkability: The Importance of Context.- A Fresh Look at the Generalised Mix Framework.- Two-Sided Statistical Disclosure Attack.- A Family of Dunces: Trivial RFID Identification and Authentication Protocols.- Louis, Lester and Pierre: Three Protocols for Location Privacy.- Efficient Oblivious Augmented Maps: Location-Based Services with a Payment Broker.- Pairing-Based Onion Routing.- Nymble: Anonymous IP-Address Blocking.- Improving Efficiency and Simplicity of Tor Circuit Establishment and Hidden Services.- Identity Trail: Covert Surveillance Using DNS.- Sampled Traffic Analysis by Internet-Exchange-Level Adversaries.- Browser-Based Attacks on Tor.- Enforcing P3P Policies Using a Digital Rights Management System.- Simplified Privacy Controls for Aggregated Services — Suspend and Resume of Personal Data.- Performance Comparison of Low-Latency Anonymisation Services from a User Perspective.- Anonymity in the Wild: Mixes on Unstructured Networks.