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Providers of location-based services seek new methods to authenticate the location of their clients. The authors 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. They show how such a traffic signature can be reliably detected even in the presence of heavy cross-traffic introduced by other femtocell users. Remarkably, they describe how the verification proceeds without revealing details of the authentication - or even the parties involved - to the location provider.
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