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    METHOD AND APPARATUS FOR PROVIDING AUTHENTICATION IN A COMMUNICATION SYSTEM
    1.
    发明申请
    METHOD AND APPARATUS FOR PROVIDING AUTHENTICATION IN A COMMUNICATION SYSTEM 审中-公开
    在通信系统中提供认证的方法和装置

    公开(公告)号：WO02067495A2

    公开(公告)日：2002-08-29

    申请号：PCT/US0201478

    申请日：2002-01-18

    Applicant: MOTOROLA INC

    Inventor： SOWA HANS CHRISTOPHER ,  MCDONALD DANIEL J ,  CHATER-LEA DAVID J ,  PAPPAS SCOTT J ,  JOHUR JASON ,  NEWKIRK DENNIS ,  KREMSKE RANDY ,  ANDERSON WALTER F

    IPC: H04L9/32 ,  H04W12/06 ,  H04W88/04 ,  H04L9/12 ,  H04L9/18

    CPC classification number: H04W12/04 ,  H04L9/0822 ,  H04L9/0833 ,  H04L9/0869 ,  H04L9/0891 ,  H04L9/3273 ,  H04L63/061 ,  H04L2209/80 ,  H04L2463/062 ,  H04W12/06 ,  H04W88/04

    Abstract: A method includes receiving an authentication request from a mobile station (401) 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 (107). A random number and a random seed are received from the authentication agent (107). The random number and the random seed are forwarded to the mobile station (401). A response to the random number and the random seed from the mobile station (401) is received and forwarded to the authentication agent (107). The authentication agent (107) compares the response with an expected response. When the authentication agent (107) authenticates the mobile station (401), a derived cipher key is received from the authentication agent (107).

    Abstract translation: 一种方法包括从移动台（401）接收认证请求，并确定是否将请求转发给认证代理。 当确定转发请求时，该请求被转发给认证代理（107）。 从认证代理（107）接收随机数和随机种子。 随机数和随机种子被转发到移动台（401）。 接收来自移动台（401）的随机数和随机种子的响应并将其转发给认证代理（107）。 认证代理（107）将响应与预期响应进行比较。 当认证代理（107）认证移动台（401）时，从认证代理（107）接收导出的密码密钥。

    DECRYPTION OF RETRANSMITTED DATA IN AN ENCRYPTED COMMUNICATION SYSTEM
    4.
    发明公开
    DECRYPTION OF RETRANSMITTED DATA IN AN ENCRYPTED COMMUNICATION SYSTEM 失效
    反复数据在SNAP埃尔滕通信系统解密

    公开(公告)号：EP0840966A4

    公开(公告)日：2000-03-29

    申请号：EP97923448

    申请日：1997-04-23

    Applicant: MOTOROLA INC

    Inventor： BRIGHT MICHAEL W ,  PAPPAS SCOTT J ,  DOBERSTEIN KEVIN G

    IPC: H04L9/00 ,  H04L1/16 ,  H04L1/18 ,  H04L9/18 ,  H04L9/22

    CPC classification number: H04L9/0637 ,  H04L1/1809 ,  H04L9/12

    Abstract: A method of decrypting retransmitted parts of a message includes receiving (201) a message comprising encryption synchronization and a plurality of encrypted blocks. Until a first block of the plurality of encrypted blocks is received with error, a first keystream is generated (205) from the encryption synchronization and at least one of the plurality of encrypted blocks, and, using the first keystream, the plurality of encrypted blocks, received without error before the first block of the plurality of encrypted blocks is received with error, is decrypted (207). A priming block is determined (211) from the message. When the first block of the plurality of encrypted blocks is received with error, a second message is transmitted (219) requesting a retransmission of the first block. Upon receiving the retransmission of the first block without error, a second keystream is generated (223) from the priming block and the retransmission of the first block and decrypting the retransmission of the first block is decrypted (225) using the second keystream.

    Decryption for mixed groups of users
    5.
    发明专利
    Decryption for mixed groups of users 未知

    公开(公告)号：GB2418575A

    公开(公告)日：2006-03-29

    申请号：GB0421006

    申请日：2004-09-22

    Applicant: MOTOROLA INC

    Inventor： PEDERSEN KRISTIAN GRONKJAER ,  KRUEGEL CHRIS ,  LANGHAM TIMOTHY M ,  PAPPAS SCOTT J

    IPC: H04L9/12 ,  H04L9/32

    Abstract: In a cellular communication system (eg. TETRA), a receiver can continue to decrypt signals despite checksum errors arising from synchronisation verification failures on behalf of transmitters which do not use real time clocks to calculate the checksum. Synchronisation verification values are transmitted via half-slot stealing and verified according to a local time base, and a fall back mode is entered if the verification value is invalid which allows continued communication, perhaps with a warning that it may comprise a replay attack. Synchronisation may proceed on the basis of previously received parameters (eg a flywheel process). This method allows flexible interoperability in mixed groups of transceivers, some of which incorporate real time clocks and some of which don't. Such failures or errors would usually terminate the communication to protect against replay attacks.

    Encryption support in combined call groups
    6.
    发明专利
    Encryption support in combined call groups 未知

    公开(公告)号：GB2418320A

    公开(公告)日：2006-03-22

    申请号：GB0420440

    申请日：2004-09-15

    Applicant: MOTOROLA INC

    Inventor： PAPPAS SCOTT J ,  KRUEGEL CHRIS ARTHUR ,  HASON BARUH ,  PEDERSEN KRISTIAN GRONKJAER

    IPC: H04L9/08 ,  H04W84/08

    Abstract: A communication system comprises a first plurality of remote stations 107, 109, 111, belonging to a first call group 119 having an associated first encryption key and first encryption mode and a second plurality of remote stations 113, 115, belonging to a second call group 121 having an associated second encryption key and second encryption mode. The encryption mode is the mode of encryption to be used by the stations belonging to the call or talk group, for example, in accordance with the TETRA standards, four default encryption modes are possible: Mode 0 is non-encrypted transmission and non-encrypted reception, Mode 1 is non-encrypted transmission and encrypted or non-encrypted reception, Mode 2 is encrypted transmission and encrypted or non-encrypted reception and Mode 3 is encrypted transmission and encrypted reception. A group controller 117 forms a third call group 123 which comprises the first and second call groups 119, 121 and which has an associated third encryption key. When communicating on the third, merged call group, the first plurality of remote stations 107, 109, 111 use the third encryption key and the first encryption mode while the second plurality of remote stations 113, 115 use the third encryption key and the second encryption mode. The invention may provide an improved system for combining call groups supporting encrypted communication (e.g. talk groups of different emergency services) and is applicable to a TETRA (Terrestrial Trunked Radio) cellular communication system.

    A communication system and method of call group management therefor
    10.
    发明专利
    A communication system and method of call group management therefor 未知

    公开(公告)号：GB2418320B

    公开(公告)日：2007-09-19

    申请号：GB0420440

    申请日：2004-09-15

    Applicant: MOTOROLA INC

    Inventor： PAPPAS SCOTT J ,  KRUEGEL CHRIS ARTHUR ,  HASON BARUH ,  PEDERSEN KRISTIAN GRONKJAER

    IPC: H04L9/08 ,  H04W84/08

    Abstract: A communication system comprises a first plurality of remote (mobile) stations (107, 109, 111) belonging to a first call group (119) having an associated first encryption key and a first encryption mode. A second plurality of remote stations (113, 115) belongs to a second call group (121) having an associated second encryption key and a second encryption mode. A group controller (117) forms a third call group (123) which comprises the first and the second call groups (119, 123) and which has an associated third encryption key. When communicating on the third, combined call group, the first plurality of remote stations (107, 109, 111) use the third encryption key and the first encryption mode whereas the second plurality of remote stations (113, 115) use the third encryption key and the second encryption mode. The invention may provide an improved system for combining call groups supporting encrypted communication. The invention is applicable to a TETRA (TErrestrial Trunked RAdio) cellular communication system.

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