Providers of location-based services seek new methods to authenticate the location of their clients. We propose a novel, intelligent infrastructure-based solution that provides spontaneous and transaction-oriented, collusion-resistant mobile device location authentication via an integrated 802.11x wireless access point and 3G femtocell access system. By simply making a voice call while remotely monitoring femtocell activity, a calling party can verify a (cooperating) called party’s location even when the participants have no preexisting relationship. We show how such a traffic signature can be reliably detected even in the presence of heavy crosstraffic introduced by other femtocell users. Remarkably, we describe how the verification proceeds without revealing details of the authentication – or even the parties involved – to the location provider.
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