The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 2013
Filed:
Jan. 15, 2009
Di Qiu, Menlo Park, CA (US);
Sherman Lo, San Mateo, CA (US);
Per Enge, Mountain View, CA (US);
Logan Scott, Fort Collins, CO (US);
Dan Boneh, Stanford, CA (US);
Ron Karpf, Corvallis, OR (US);
Di Qiu, Menlo Park, CA (US);
Sherman Lo, San Mateo, CA (US);
Per Enge, Mountain View, CA (US);
Logan Scott, Fort Collins, CO (US);
Dan Boneh, Stanford, CA (US);
Ron Karpf, Corvallis, OR (US);
Geocodex LLC, Tarzana, CA (US);
Leland Stanford Junior University, Stanford, CA (US);
Abstract
A data encryption and decryption system securely geoencrypts data using location-dependent navigation signals. To increase the entropy of the cryptographic key to guard against a brute-force attack, geoencryption is made to depend on largely time-independent characteristics of the navigation signals that are not easily spoofed, including the time difference of arrival, the envelope-to-cycle difference, the differential signal-to-noise, the signal envelope shape, and the directions of arrival of the navigation signal set.