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

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;
• and
• computing the geotag T from c′ using Reed-Solomon decoding and a hash function.