Cheriton School of Computer Science Professor Ian Goldberg, along with his PhD student Nik Unger and colleagues, have won three prestigious paper awards at the 2018 Privacy Enhancing Technologies Symposium (PETS). Held this year in Barcelona, Spain from July 24–27, 2018, PETS is the top research venue dedicated to the study and advancement of privacy enhancing technologies.
2018 Andreas Pfitzmann Best Student Paper Award
Their paper describes a cryptographic protocol that allows Internet users — in particular, those who use privacy-enhancing tools — to receive anonymous tokens for solutions they provide to web access challenges, such as CAPTCHAs, that are designed to block malicious traffic. The protocol allows the tokens to be exchanged in the future for access to sites without requiring the user to interact with the challenges, and without the user being trackable from one site to another, thereby increasing access speed while maintaining anonymity.
The Andreas Pfitzmann Best Student Paper Award is conferred for papers written solely or primarily by a student. It is based on the scientific quality of the paper, its expected impact on the field, and the quality of the student’s presentation. The award takes its name from the late Andreas Pfitzmann, a German computer scientist and professor of data protection and privacy at the Technical University of Dresden.
2018 Caspar Bowden Award for Outstanding Research in Privacy Enhancing Technologies
Their paper examined ways to lower the cost of private information retrieval, a task that is typically computationally costly and notoriously difficult to scale. The authors explored lower-cost relaxations of information-theoretic private information retrieval, based on dummy queries, sparse vectors and compositions with an anonymity system. They prove the security of each scheme using a flexible differentially private definition for private queries that can capture notions of imperfect privacy.
2018 Caspar Bowden Award for Outstanding Research in Privacy Enhancing Technologies runner-up
Their paper develops approaches for off-the-record messaging by proposing three new strongly deniable key exchange protocols that are designed to be used in modern secure messaging systems to provide simultaneously strong authentication to the intended party in a private conversation, while preventing that party or any other, even if being coerced, from being able to prove who they were talking to — or even whether an actual conversation took place at all — to a third party.
The Caspar Bowden Award for Outstanding Research in Privacy Enhancing Technologies is named for the late Caspar Bowden, a British privacy expert who worked for more two decades advocating for the right to privacy and freedom from mass surveillance. He believed deeply in privacy enhancing technologies as a means to protect these rights and was involved in the PETS community for most of its history.
“Congratulations to Ian, Nik, and their international colleagues in academia and industry for their best paper awards,” said Dan Brown, Director of the David R. Cheriton School of Computer Science. “It’s wonderful to see the innovative research conducted by members of our Cryptography, Security, and Privacy group receiving such great and prestigious recognition from peers in the privacy enhancing technology community.”