Privacy Enhancing Technologies, 4th International Workshop, PET 2004, Toronto, Canada, May 26-28, 2004, Revised Selected Papers

Anonymity and Covert Channels in Simple Timed Mix-Firewalls.- Practical Traffic Analysis: Extending and Resisting Statistical Disclosure.- The Traffic Analysis of Continuous-Time Mixes.- Reputable Mix Networks.- Secure Outsourcing of Sequence Comparisons.- An Improved Construction for Universal Re-encryption.- Electromagnetic Eavesdropping Risks of Flat-Panel Displays.- On the Anonymity of Banknotes.- FLASCHE - A Mechanism Providing Anonymity for Mobile Users.- Cryptographically Protected Prefixes for Location Privacy in IPv6.- Protecting User Data in Ubiquitous Computing: Towards Trustworthy Environments.- Synchronous Batching: From Cascades to Free Routes.- On Flow Correlation Attacks and Countermeasures in Mix Networks.- Measuring Anonymity in a Non-adaptive, Real-Time System.- Panel Discussion - Mix Cascades Versus Peer-to-Peer: Is One Concept Superior?.- On the PET Workshop Panel "Mix Cascades Versus Peer-to-Peer: Is One Concept Superior?".- A Formal Privacy System and Its Application to Location Based Services.- Privacy-Preserving Trust Negotiations.- Language-Based Enforcement of Privacy Policies.- Searching for Privacy: Design and Implementation of a P3P-Enabled Search Engine.- Contextualized Communication of Privacy Practices and Personalization Benefits: Impacts on Users' Data Sharing and Purchase Behavior.- Panel Discussion - Conforming Technology to Policy: The Problems of Electronic Health Records.