Geosecurity methods and devices using geotags derived from noisy location data from multiple sources
First Claim
1. A method for geo-security comprising:
- receiving at a device RF communication signals transmitted from N multiple distinct classes of RF communication systems;
extracting at the device from the RF communication signals N signal parameters x′
that are time-invariant and location-dependent;
computing at the device a current geotag T from the signal parameters x′ and
a public identifier P associated with a geo-secured function of the device;
comparing at the device the current geotag T′
with a stored geotag T;
andexecuting at the device the geo-secured function based on the result of the comparison of the current geotag T′
with the stored geotag T;
wherein computing the geotag from the signal parameters comprises;
quantizing the N signal parameters x′
to produce N corresponding quantized signal parameters q′
;
computing a vector c′
from q′ and
P; and
computing the geotag T from c′
using Reed-Solomon decoding and a hash function.
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Accused Products
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.
35 Citations
8 Claims
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1. A method for geo-security comprising:
-
receiving at a device RF communication signals transmitted from N multiple distinct classes of RF communication systems; extracting at the device from the RF communication signals N signal parameters x′
that are time-invariant and location-dependent;computing at the device a current geotag T from the signal parameters x′ and
a public identifier P associated with a geo-secured function of the device;comparing at the device the current geotag T′
with a stored geotag T;and executing at the device the geo-secured function based on the result of the comparison of the current geotag T′
with the stored geotag T;wherein computing the geotag from the signal parameters comprises; quantizing the N signal parameters x′
to produce N corresponding quantized signal parameters q′
;computing a vector c′
from q′ and
P; andcomputing the geotag T from c′
using Reed-Solomon decoding and a hash function.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification