Workshop on Privacy Enhancing Technologies Toronto, Canada 26 - 28 May 2004 Call for Papers: 4th Workshop on Privacy Enhancing Technologies Privacy and anonymity are increasingly important in the online world. Corporations and governments are starting to realize their power to track users and their behavior, and restrict the ability to publish or retrieve documents. Approaches to protecting individuals, groups, and even companies and governments from such profiling and censorship have included decentralization, encryption, and distributed trust. Building on the success of the previous workshops (held in Berkeley in July 2000, San Francisco in April 2002, and Dresden in March 2003), this workshop addresses the design and realization of such privacy and anti-censorship services for the Internet and other communication networks. These workshops bring together anonymity and privacy experts from around the world to discuss recent advances and new perspectives. The workshop seeks submissions from academia and industry presenting novel research on all theoretical and practical aspects of privacy technologies, as well as experimental studies of fielded systems. We encourage submissions from other communities such as law and business that present their perspectives on technological issues. As in past years, we will publish proceedings after the workshop in the Springer Lecture Notes in Computer Science series (or similar). This year's workshop immediately follows the 6th Information Hiding Workshop, also hosted at the University of Toronto. Suggested topics include but are not restricted to: * Efficient (technically or economically) realization of privacy services * Techniques for censorship resistance * Anonymous communication systems (theory or practice) * Location privacy * Anonymous publishing systems (theory or practice) * Attacks on anonymity systems (e.g., traffic analysis) * New concepts in anonymity systems * Protocols that preserve anonymity/privacy * Models for anonymity and unobservability * Models for threats to privacy * Novel relations of payment mechanisms and anonymity * Privacy-preserving/protecting access control * Privacy-enhanced data authentication/certification * Profiling, data mining, and data protection technologies * Reliability, robustness, and attack resistance in privacy systems * Providing/funding privacy infrastructures (e.g., volunteer versus business) * Pseudonyms, identity, linkability, and reputation * Privacy and anonymity in peer-to-peer architectures * Usability issues and user interfaces for PETs * Policy, law, and human rights -- anonymous systems in practice * Incentive-compatible solutions to privacy protection * Economics of privacy systems * Fielded systems and techniques for enhancing privacy in existing systems Paper submission: 26 January 2004 Notification of acceptance: 5 April 2004 Camera-ready copy for preproceedings: 3 May 2004 Camera-ready copy for proceedings: 28 June 2004 General Chair: Richard Owens (firstname.lastname@example.org), University of Toronto, CA Program Chairs: David Martin (email@example.com), University of Massachusetts at Lowell, USA Andrei Serjantov (Andrei.Serjantov@cl.cam.ac.uk), University of Cambridge, UK Program Committee: Alessandro Acquisti, Heinz School, Carnegie Mellon University, USA Caspar Bowden, Microsoft EMEA, England Jean Camp, Kennedy School, Harvard University, USA Richard Clayton, University of Cambridge, England Lorrie Cranor, AT&T Labs - Research, USA George Danezis, University of Cambridge, England Roger Dingledine, The Free Haven Project, USA Hannes Federrath, Universitgland (program co-chair) Adam Shostack, Informed Security Inc., Canada Paul Syverson, Naval Research Lab, USA Submitted papers must not substantially overlap with papers that have been published or that are simultaneously submitted to a journal or a conference with proceedings. Papers should be at most 15 pages excluding the bibliography and well-marked appendices (using 11-point font and reasonable margins), and at most 20 pages total. Submission of shorter papers (from around 4 pages) is strongly encouraged whenever appropriate. Please check the final Call For Papers on the Workshop's Web site (http://petworkshop.org/) for other formatting requirements and up-to-date information. Committee members are not required to read the appendices and the paper should be intelligible without them. The paper should start with the title, names of authors and an abstract. The introduction should give some background and summarize the contributions of the paper at a level appropriate for a non-specialist reader. During the workshop preproceedings will be made available. Final versions are not due until after the workshop, giving the authors the opportunity to revise their papers based on discussions during the meeting. Submissions can be made in Postscript or PDF format. To submit a paper, send a plain ASCII text email to the program chairs (firstname.lastname@example.org) containing the title and abstract of the paper, the authors' names, email and postal addresses, phone and fax numbers, and identification of the contact author. To the same message, attach your submission (as a MIME attachment). Papers must be received by 26 January 2004. If you do not receive a confirmation within a day or two, your submission was not received. Notification of acceptance or rejection will be sent to authors no later than 5 April 2004 and authors will have the opportunity to revise for the preproceedings version by May 3, 2004. Submission implies that, if accepted, the author(s) agree to publish in the proceedings and to sign a standard copyright release, and also that an author of the paper will present it at the workshop. We also invite proposals of up to 2 pages for panel discussions or other relevant presentations. In your proposal, (1) describe the nature of the presentation and why it is appropriate to the workshop, (2) suggest a duration for the presentation (ideally between 45 and 90 minutes), (3) give brief descriptions of the presenters, and (4) indicate which presenters have confirmed their availability for the presentation if it is scheduled. The program committee will consider presentation proposals along with other workshop events, and will respond by the paper decision date with individual reviewer comments and an indication of its interest in scheduling the event. The proceedings will contain abstracts of the presentations that take place at the workshop.