Interdisciplinary Research Group in Socio-technical Cybersecurity
Selective location blinding using hash chains
Location-based applications require a user’s movements and positions to provide customized services. However, location is a sensitive piece of information that should not be revealed unless strictly necessary. In this paper we propose a procedure that allows a user to control the precision in which his location information is exposed to a service provider, while allowing his location to be certiﬁed by a location veriﬁer. Our procedure makes use of a hash chain to certify the location information in such a way that the hashes of the chain correspond to an increasing level of precision.
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