Enhancing applications with approved location stamps
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This contribution proposes a service that provides location information of a GSM mobile device that can be mapped to a specific user and can be verified by means of asymmetric cryptography. The service returns a digitally signed record - a location stamp - that can be used as a proof, eg, in commercial transactions using mobile telephones.
[1] Scott B. Guthery,et al. How to Turn a GSM SIM into a Web Server , 2001, CARDIS.
[2] Alf Zugenmaier,et al. Location Stamps for Digital Signatures: A New Service for Mobile Telephone Networks , 2001, ICN.