A Privacy Protection Scheme for a Scalable Control Method in Context-Dependent Services

Authors:
Rei Yoshida;Rie Shigetomi;Kazuki Yoshizoe;Akira Otsuka;Hideki Imai
Affiliations:
Imai Lab., Dept. of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, Tokyo, Japan;National Institute of Advanced Industrial Science and Technology, Research Center for Information Security, Tokyo, Japan;Imai Lab., Dept. of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, Tokyo, Japan;National Institute of Advanced Industrial Science and Technology, Research Center for Information Security, Tokyo, Japan;Imai Lab., Dept. of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, Tokyo, Japan and National Institute of Advanced Industrial Science a ...
Venue:
Research in Cryptology
Year:
2008

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Abstract

Provision of context-dependent services is triggered when the context satisfies an execution condition. To deliver these services, users' contexts have to be determined by terminals such as GPS. However, GPS has efficiency (it must collect as many contexts as possible to provide services appropriately) and privacy problems (all data is concentrated on one place). Previous studies have addressed only either one of the two problems. We propose a scheme that protects users' privacy while maintaining efficiency by using the Randomized Response Technique.