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Location information should be verifiable in order to support new computing and information services. In this paper, we adapt the classical challenge-response method for authentication to the task of verifying an entity's location. Our scheme utilizes a collection of transmitters, and adapts their power allocations to verify a user's claimed location. This strategy, which we call power-modulated challenge response, is able to be used with existing wireless sensor networks, and we present threedoi:10.1109/glocom.2007.15 dblp:conf/globecom/ZhangLT07 fatcat:gdr5qfkbozdsfeqjyyo66aonzq