How unique is your web browser?
PETS'10 Proceedings of the 10th international conference on Privacy enhancing technologies
Detecting and defending against third-party tracking on the web
NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
Expressive privacy control with pseudonyms
Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM
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The price of Internet services is user information, and many pay it without hesitation. While myriad privacy tools exist that thwart the detailed compilation of information about user habits, these tools often assume that reduced functionality is always justified by increased privacy. In contrast, we propose the adoption of functional privacy as a guiding principle in the development of new privacy tools. Functional privacy has the overarching goal of maintaining all functionality while improving privacy as much as practically possible -- rather than forcing users to make decisions about tradeoffs that they may not fully understand. As a concrete example of a functional privacy approach, we implemented Milk, a Google Chrome extension that automatically rewrites HTTP cookies to strictly bind them to the first-party domains from which they were set. We also identify existing privacy-preserving tools that we believe embody the principle of functional privacy and discuss the limitations of others.