Constitutes the refereed post-proceedings of the 6th International Workshop on Privacy Enhancing Technologies, PET 2006, held in Cambridge, UK, in June 2006 co-located with WEIS 2006, the Workshop on the Economics of Information Security, and WOTE 2006, the IAVoSS Workshop On Trustworthy Elections.

6th Workshop on Privacy Enhancing Technologies.- Privacy for Public Transportation.- Ignoring the Great Firewall of China.- Imagined Communities: Awareness, Information Sharing, and Privacy on the Facebook.- Enhancing Consumer Privacy in the Liberty Alliance Identity Federation and Web Services Frameworks.- Traceable and Automatic Compliance of Privacy Policies in Federated Digital Identity Management.- Privacy Injector — Automated Privacy Enforcement Through Aspects.- A Systemic Approach to Automate Privacy Policy Enforcement in Enterprises.- One Big File Is Not Enough: A Critical Evaluation of the Dominant Free-Space Sanitization Technique.- Protecting Privacy with the MPEG-21 IPMP Framework.- Personal Rights Management – Taming Camera-Phones for Individual Privacy Enforcement.- Improving Sender Anonymity in a Structured Overlay with Imprecise Routing.- Selectively Traceable Anonymity.- Valet Services: Improving Hidden Servers with a Personal Touch.- Blending Different Latency Traffic with Alpha-mixing.- Private Resource Pairing.- Honest-Verifier Private Disjointness Testing Without Random Oracles.- A Flexible Framework for Secret Handshakes.- On the Security of the Tor Authentication Protocol.- Optimal Key-Trees for Tree-Based Private Authentication.- Simple and Flexible Revocation Checking with Privacy.- Breaking the Collusion Detection Mechanism of MorphMix.- Linking Anonymous Transactions: The Consistent View Attack.- Preserving User Location Privacy in Mobile Data Management Infrastructures.- The Effects of Location Access Behavior on Re-identification Risk in a Distributed Environment.