Motorola Corporation

General Dynamics C4 Systems, Inc.

Michael A Savage

Marc Andre Boillot

Bernard Richard McKibben

Ty B Lindteigen

Stuart S Kreitzer

Keith M Klug

Brent M McKay

Bradley J Rainbolt

Fred R Villa

Bryce Sutherland

Barbara S Winterfield

William C Neubauer, Iii

Jerry D Ray

Bruce Alan Fette

Gerald V Piosenka

William Robert Worger

David T Gustafson

Paul R Kennedy

Joseph Kish, Iii

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. The security association can be used to encrypt voice packets being sent from the first device to the second device. The security association and updated state vector can then be used to decrypt the encrypted voice packets received by the second device from the first device.

Method and apparatus for fast secure session establishment on half-duplex point-to-point voice cellular network channels

Techniques are provided for secure group communications in a wireless dispatch system which includes a group of devices. The group of devices can include a first secure device which communicates with a plurality of second secure devices over a channel.

Method and apparatus for rapid secure session establishment on half-duplex AD-hoc group voice cellular network channels

A security module for use in a cellular telephone provides for low power consumption. The security module includes a vocoder processor for manipulating signals from the telephone's microphone and to the telephone's ear piece; an encryption engine; a modem processor for controlling transmitted and received data from the cellular telephone; and a security system controller. The processors consume virtually no power when the phone is in the standby mode and very little power to produce encrypted communication when the cellular phone is operational.

Telecommunications security module

A data locking system which modifies data in accordance with a renewable key variable derived from the exclusive ORing of a pseudorandom combination number from an external source means with an altered key variable.

Electronic keying scheme for locking data

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Chandler, AZ, United States of America

Michael A Savage