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:
May. 26, 2009
Filed:
Sep. 13, 2001
Thomas P. Hardjono, Winchester, MA (US);
Lakshminath Dondeti, Chelmsford, MA (US);
Thomas P. Hardjono, Winchester, MA (US);
Lakshminath Dondeti, Chelmsford, MA (US);
Nortel Networks Limited, St. Laurent, Quebec, CA;
Abstract
A method for managing encryption keys in a communication system having a plurality of communication devices includes establishing a set of cryptographic keys for secure communication. Each of the cryptographic keys is associated with a geographic region. A geographic region is determined for a communication device and at least one cryptographic key is distributed to the communication device based on the geographic region of the communication device. At least one cryptographic key may be used to derive further cryptographic keys associated with a set of sub-regions of the geographic region associated with the communication device.