Patent ID: 7539313
Filing Date: 2009-05-26
Classification: H04L

Abstract:
1. A method for managing encryption keys in a communication system having a plurality of communication devices, the method comprising: establishing a set of cryptographic keys for secure communication, each cryptographic key associated with a different geographic region; determining a geographic region associated with a mobile communication device based on the geographic region of the mobile communication device; forwarding one of the cryptographic keys in the set of cryptographic keys to the mobile communication device, the forwarded one of the cryptographic keys being selected in response to the determined geographic region of the mobile communication device and the geographic region associated with the forwarded one of the cryptographic keys; detecting that the mobile device has moved to a new geographic region; and forwarding a different one of the cryptographic keys to the communication device, the different one of the cryptographic keys being selected responsive to the new geographic region and the associated geographic region of the different one of the cryptographic keys.