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A method for obtaining digital signatures and public-key cryptosystems
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Secure two-party computational geometry
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SPATE: small-group PKI-less authenticated trust establishment
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A meeting scheduling problem respecting time and space
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Public-key cryptosystems based on composite degree residuosity classes
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Louis, Lester and Pierre: three protocols for location privacy
PET'07 Proceedings of the 7th international conference on Privacy enhancing technologies
Evaluating 2-DNF formulas on ciphertexts
TCC'05 Proceedings of the Second international conference on Theory of Cryptography
Privacy protection in location-based services through a public-key privacy homomorphism
EuroPKI'07 Proceedings of the 4th European conference on Public Key Infrastructure: theory and practice
k-indistinguishable traffic padding in web applications
PETS'12 Proceedings of the 12th international conference on Privacy Enhancing Technologies
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Proceedings of the 22nd ACM international conference on Conference on information & knowledge management
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Location-Sharing-Based Services (LSBS) complement Location-Based Services by using locations from a group of users, and not just individuals, to provide some contextualized service based on the locations in the group. However, there are growing concerns about the misuse of location data by third-parties, which fuels the need for more privacy controls in such services. We address the relevant problem of privacy in LSBSs by providing practical and effective solutions to the privacy problem in one such service, namely the fair rendezvous point (FRVP) determination service. The privacy preserving FRVP (PPFRVP) problem is general enough and nicely captures the computations and privacy requirements in LSBSs. In this paper, we propose two privacy-preserving algorithms for the FRVP problem and analytically evaluate their privacy in both passive and active adversarial scenarios. We study the practical feasibility and performance of the proposed approaches by implementing them on Nokia mobile devices. By means of a targeted user-study, we attempt to gain further understanding of the popularity, the privacy and acceptance of the proposed solutions.