Bryce R Sutherland

US Patent:

7747021, Jun 29, 2010

Filed:

May 18, 2005

Appl. No.:

11/132707

Inventors:

Ty B. Lindteigen - Chandler AZ, US
Bernard R. McKibben - Louisville CO, US
Jerry D. Ray - Phoenix AZ, US
Michael A. Savage - Chandler AZ, US
Bryce Sutherland - Gilbert AZ, US
Barbara S. Winterfield - Mesa AZ, US
Keith M. Klug - Mesa AZ, US
Stuart S. Kreitzer - Coral Springs FL, US
Brent M. McKay - Chandler AZ, US
Bradley J. Rainbolt - Sunrise FL, US
Fred R. Villa - Gilbert AZ, US
Marc A. Boillot - Plantation FL, US

Assignee:

General Dynamics C4 Systems, Inc. - Scottsdale AZ
Motorola, Inc. - Schaumburg IL

International Classification:

H04L 9/00

US Classification:

380274, 380270

Abstract:

Methods and apparatus are provided for secure communication techniques in a communication system. The system can include a first device which communicates with a second device over a channel. A security association can be established during a first session between the devices via an asymmetric key exchange. The security association comprises a Traffic Encryption Key (TEK) and a first state vector. The TEK comprises a shared, secret symmetric key. The security association is stored in each of the devices for use during a second session between the devices to expedite security association establishment during call set-up of the second session. The security association can be associated with the second device in the first device, and with the first device in the second device. An updated state vector can be generated at the first device. A second session can be established between the first device and the second device by using the TEKs from the first session and the updated state vector.

US Patent:

20060281480, Dec 14, 2006

Filed:

May 18, 2005

Appl. No.:

11/132643

Inventors:

Keith Klug - Mesa AZ, US
Stuart Kreitzer - Coral Springs FL, US
Brent McKay - Chandler AZ, US
Bradley Rainbolt - Sunrise FL, US
Fred Villa - Gilbert AZ, US
Marc Boillot - Plantation FL, US
Ty Lindteigen - Chandler AZ, US
Bernard McKibben - Louisville CO, US
William Neubauer - Gilbert AZ, US
Jerry Ray - Phoenix AZ, US
Michael Savage - Chandler AZ, US
Bryce Sutherland - Gilbert AZ, US
Barbara Winterfield - Mesa AZ, US

International Classification:

H04B 7/00

US Classification:

455518000

Abstract:

An apparatus () and corresponding methods (FIG. ) to facilitate maintaining crypto synchronization while processing communication signals in a communication unit includes a vocoder () configured to convert input audio band signals to vocoder output frames; a crypto processor () configured to encrypt the vocoder output frames to provide encrypted output frames; and a synchronizer () configured to substitute in a predetermined manner synchronization information corresponding to an encryption state of the crypto processor for a portion of the encrypted data in a portion of the encrypted output frames to provide resultant output synchronization frames suitable for synchronizing a decryption process at a target communication unit.