Geosecurity methods and devices using geotags derived from noisy location data from multiple sources

US8315389B2 · kind B2 · utility

Assignee

• The Board of Trustees of the Leland Stanford Junior University · US

Inventors

• Di Qiu · Menlo Park, US
• Sherman C. Lo · San Mateo, US
• David S. De Lorenzo · Olympia, US
• Dan Boneh · Palo Alto, US
• Per K. Enge · Mountain View, US

Key dates

• Filing date: Jan 25, 2010
• Grant date: Nov 20, 2012
• Expiry date: Jun 20, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L63/107
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In a geo-security system, a device receives RF signals from multiple distinct classes of RF communication systems and extracts location-dependent signal parameters. A current geotag is computed from the parameters by fuzzy extractors involving quantization of the parameters and Reed-Solomon decoding to provide a reproducible unique geotag. The current geotag is compared with a stored geotag, and a geo-secured function of the device is executed based on the result of the comparison. The use of multiple signal sources of different types, combined with special fuzzy extractors provides a robust geotag that allows both lower false rejection rate and lower false acceptance rate.