Communications of the ACM
Seeing-Is-Believing: Using Camera Phones for Human-Verifiable Authentication
SP '05 Proceedings of the 2005 IEEE Symposium on Security and Privacy
Multichannel Security Protocols
IEEE Pervasive Computing
Expandable grids for visualizing and authoring computer security policies
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the 6th international conference on Mobile systems, applications, and services
On the security of public key protocols
SFCS '81 Proceedings of the 22nd Annual Symposium on Foundations of Computer Science
Real life challenges in access-control management
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Who's viewed you?: the impact of feedback in a mobile location-sharing application
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Shake Well Before Use: Intuitive and Secure Pairing of Mobile Devices
IEEE Transactions on Mobile Computing
Vanish: increasing data privacy with self-destructing data
SSYM'09 Proceedings of the 18th conference on USENIX security symposium
Oops, I did it again: mitigating repeated access control errors on facebook
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
MobiMix: Protecting location privacy with mix-zones over road networks
ICDE '11 Proceedings of the 2011 IEEE 27th International Conference on Data Engineering
SP '11 Proceedings of the 2011 IEEE Symposium on Security and Privacy
Quantifying location privacy: the case of sporadic location exposure
PETS'11 Proceedings of the 11th international conference on Privacy enhancing technologies
"I regretted the minute I pressed share": a qualitative study of regrets on Facebook
Proceedings of the Seventh Symposium on Usable Privacy and Security
Eyeing your exposure: quantifying and controlling information sharing for improved privacy
Proceedings of the Seventh Symposium on Usable Privacy and Security
Reasons, rewards, regrets: privacy considerations in location sharing as an interactive practice
Proceedings of the Eighth Symposium on Usable Privacy and Security
When privacy and utility are in harmony: towards better design of presence technologies
Personal and Ubiquitous Computing
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Recently, many location-sharing services (LSSs) have emerged that share data collected using mobile devices. However, research has shown that many users are uncomfortable with LSS operators managing their location histories, and that the ease with which contextual data can be shared with unintended audiences can lead to regrets that sometimes outweigh the benefits of these systems. In an effort to address these issues, we have developed SLS: a secure location sharing system that combines location-limited channels, multi-channel key establishment, and untrusted cloud storage to hide user locations from LSS operators while also limiting unintended audience sharing. In addition to describing the key agreement and location-sharing protocols used by SLS, we discuss an iOS implementation of SLS that enables location sharing at tunable granularity through an intuitive policy interface on the user's mobile device.