Patent ID: 8391488

Claim:
A data encryption and decryption system comprising: a geoencryption apparatus including: a data file to be securely transmitted; a random key for encrypting the data file to be securely transmitted; an encryption device, adapted to encrypt the data file with the random key to create a coded file; and a geocoding device, adapted to geolock the random key by encoding it with a location-dependent navigation signal, wherein the geolocking process depends on a time difference of arrival (TDOA) of the location-dependent navigation signal and at least one of the following stable propagation anomalies of the location-dependent navigation signal: an envelope-to-carrier difference (EDC); a differential signal-to-noise ratio (DSNR); a signal envelope shape; and a direction of arrival of the navigation signal; and a geo-decryption apparatus including: a data receiver adapted to receive the coded file; a navigation receiver adapted to receive the location-dependent navigation signal and to measure the at least one stable propagation anomaly; and a geodecoding device, adapted to unlock the random key by decoding it with the location-dependent navigation signal, wherein the decoding process depends on the at least one stable propagation anomaly comprising at least one of the EDC, the DSNR, the signal envelope shape, and the direction of arrival of the navigation signal.