Motorola Corporation

Motorola Solutions, Inc.

Walter F Anderson

Daniel J McDonald

Scott James Pappas

David J Chater-Lea

Hans Christopher Sowa

Dennis R Newkirk

Jason J Johur

Randy Kremske

Glen B Walton

Alan L Wilson

Paul M Bocci

Glenn Brian Walton

Dennis Newkirk

Daniel J Mc Donald

Scotta J Pappas

A plurality of encryption keys is generated, and each encryption key is associated with one geographical area of a plurality of geographical areas. Each encryption key is forwarded to one or more base stations in the geographical area associated with the encryption key. At least one of the plurality of geographical areas that is adjacent to a first geographical area is determined, yielding one or more adjacent geographical areas, and an encryption key for at least one of the one or more adjacent geographical areas is forwarded to at least one base station covering the first geographical area.

Method and apparatus for storing and distributing encryption keys

A home location register stores key material related to mobile stations associated with the home location register. A first visited location register associated with a first site in a first zone stores key material related to a first mobile station of the mobile stations associated with the home location register. When the first mobile station roams to a second site in a second zone associated with a second visited location register, the key material related to the first mobile station is encrypted with an interkey, yielding encrypted key material, wherein the interkey is used only by infrastructure system devices other than a mobile station for encrypting at least the key material for transport between at least the first and second zones. The encrypted key material is forwarded to the second visited location register.

A first infrastructure system device other than a mobile station generates key material and forwards the key material to a second infrastructure system device other than a mobile station. A determination is made as to whether a mobile station for which the key material is directed is active on the system, and if so the key material is forwarded to a base station where the mobile station is active. The base station forwards the key material to the mobile station.

A first infrastructure system device other than a mobile station generates an encryption key and encrypts the encryption key with a first intrakey associated with a first zone that includes a second infrastructure system device other than a mobile station, yielding a first encrypted encryption key. The first intrakey is used only by infrastructure system devices other than a mobile station for encrypting at least the encryption key prior to transport within the first zone. The first infrastructure system device forwards the first encrypted encryption key to the second infrastructure system device.

A method includes receiving an authentication request from a mobile station () and determining whether to forward the request to an authentication agent. When it is determined to forward the request, the request is forwarded to the authentication agent (). A random number and a random seed are received from the authentication agent (). The random number and the random seed are forwarded to the mobile station (). A response to the random number and the random seed from the mobile station () is received and forwarded to the authentication agent (). The authentication agent () compares the response with an expected response. When the authentication agent () authenticates the mobile station (), a derived cipher key is received from the authentication agent ().

Method and apparatus for providing authentication in a communication system

A method of key distribution includes generating, by a first system device (), key material and forwarding the key material from the first system device () to a second system device (). It is determined whether a mobile station (), for which the key material is directed, is active on the system. When the mobile station is active, the key material is forwarded to a base station () where the mobile station () is active, and the base station () forwards the key material to the mobile station ().

A layered session data unit frame (300) is provided wherein a first frame (200), designated a session data unit('SDU'), containing user information (209), a link control field (205) and an encryption field (207), is divided into a plurality of smaller frames (321, 323), each having an information field and designated a link data unit('LDU'). According to the invention, the SDU user information (209) is allocated into the information fields (211, 213) of the plurality of LDU's. The SDU link control field (205) is divided into a plurality of sub-fields and imbedded into the information fields of a first group of LDU's. The SDU encryption field (207) is divided into a plurality of sub-fields and imbedded into the information fields of a second group of LDU's. The sub-fields may be distributed throughout the LDU's in a generally uniform fashion. For instance, where the user information comprises coded voice words, the sub-fields may be separated by 30 msec words such that voice may be produced during the transmission of the field without any audio delay.

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Algonquin, IL, United States of America

Walter F Anderson