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

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 (, University of Toronto, CA

Program Chairs:
David Martin (, University of Massachusetts at Lowell, USA
Andrei Serjantov (, 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
( 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
( 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.