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21.发明专利
公开(公告)号：PL324465A1
公开(公告)日：1998-05-25
申请号：PL32446597
申请日：1997-04-23
Applicant: MOTOROLA INC
Inventor： BRIGHT MICHAEL W , PAPPAS SCOTT J , DOBERSTEIN KEVIN G
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公开(公告)号：CA2226716A1
公开(公告)日：1997-11-27
申请号：CA2226716
申请日：1997-04-23
Applicant: MOTOROLA INC
Inventor： PAPPAS SCOTT J , BRIGHT MICHAEL W , DOBERSTEIN KEVIN G
Abstract: The method generally includes the steps of receiving (201) a message (100) comprising a message indicator (101) and a plurality of encrypted blocks (103 through 111). When at least one block of the plurality of encrypted blocks is received with error, a second message is transmitted (215), which second message requests a retransmission of the at least one block. Upon receiving the retransmission of the at least one block without error, a keystream is generated (219) from the message indicator and the at least one block is decrypted using the keystream.
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公开(公告)号：DE602005001167D1
公开(公告)日：2007-07-05
申请号：DE602005001167
申请日：2005-03-24
Applicant: MOTOROLA INC
Inventor： PEDERSEN KRISTIAN GRONKJAER , PAPPAS SCOTT J , LANGHAM TIMOTHY M
Abstract: An encryption apparatus (200) comprises an elapsed time processor (205) which determines an elapsed time from a transmission of a previous encryption synchronisation message such as a synchronisation initialisation value. Encryption synchronisation messages are transmitted by replacing user data transmissions, e.g. by slot stealing. A priority processor (207) determines a first priority of the current user data transmission and a time threshold function (209) provides a corresponding first time. A transmit unit (201) transmits a new encryption synchronisation message when the elapsed time exceeds the first time threshold. The apparatus (200) further comprises a function controller (211) which is operable to modify the function between the first priority and the first time threshold during the call. The invention is particularly applicable to TETRA and may provide a dynamic trade-off between the speed of encryption re-synchronisation and late entry and the audio quality degradation.
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公开(公告)号：DK1362444T3
公开(公告)日：2007-06-18
申请号：DK02720815
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 , WALTON GLENN BRIAN
Abstract: A method of key distribution includes generating, by a first system device (101), key material and forwarding the key material from the first system device (101) to a second system device (107). It is determined whether a mobile station (401), 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 (115) where the mobile station (401) is active, and the base station (115) forwards the key material to the mobile station (401).
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公开(公告)号：AT363165T
公开(公告)日：2007-06-15
申请号：AT05251869
申请日：2005-03-24
Applicant: MOTOROLA INC
Inventor： PEDERSEN KRISTIAN GRONKJAER , PAPPAS SCOTT J , LANGHAM TIMOTHY M
Abstract: An encryption apparatus (200) comprises an elapsed time processor (205) which determines an elapsed time from a transmission of a previous encryption synchronisation message such as a synchronisation initialisation value. Encryption synchronisation messages are transmitted by replacing user data transmissions, e.g. by slot stealing. A priority processor (207) determines a first priority of the current user data transmission and a time threshold function (209) provides a corresponding first time. A transmit unit (201) transmits a new encryption synchronisation message when the elapsed time exceeds the first time threshold. The apparatus (200) further comprises a function controller (211) which is operable to modify the function between the first priority and the first time threshold during the call. The invention is particularly applicable to TETRA and may provide a dynamic trade-off between the speed of encryption re-synchronisation and late entry and the audio quality degradation.
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Patent Agency Ranking
公开(公告)号：AT354898T
公开(公告)日：2007-03-15
申请号：AT02720815
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 , WALTON GLENN BRIAN
Abstract: A method of key distribution includes generating, by a first system device (101), key material and forwarding the key material from the first system device (101) to a second system device (107). It is determined whether a mobile station (401), 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 (115) where the mobile station (401) is active, and the base station (115) forwards the key material to the mobile station (401).
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27.发明专利
公开(公告)号：PL324462A1
公开(公告)日：1998-05-25
申请号：PL32446297
申请日：1997-04-23
Applicant: MOTOROLA INC
Inventor： DOBERSTEIN KEVIN G , PAPPAS SCOTT J , BRIGHT MICHAEL W
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公开(公告)号：AU3203597A
公开(公告)日：1997-12-09
申请号：AU3203597
申请日：1997-04-23
Applicant: MOTOROLA INC
Inventor： DOBERSTEIN KEVIN G , PAPPAS SCOTT J , BRIGHT MICHAEL W
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公开(公告)号：DE602005001167T2
公开(公告)日：2008-01-24
申请号：DE602005001167
申请日：2005-03-24
Applicant: MOTOROLA INC
Inventor： PEDERSEN KRISTIAN GRONKJAER , PAPPAS SCOTT J , LANGHAM TIMOTHY M
Abstract: An encryption apparatus (200) comprises an elapsed time processor (205) which determines an elapsed time from a transmission of a previous encryption synchronisation message such as a synchronisation initialisation value. Encryption synchronisation messages are transmitted by replacing user data transmissions, e.g. by slot stealing. A priority processor (207) determines a first priority of the current user data transmission and a time threshold function (209) provides a corresponding first time. A transmit unit (201) transmits a new encryption synchronisation message when the elapsed time exceeds the first time threshold. The apparatus (200) further comprises a function controller (211) which is operable to modify the function between the first priority and the first time threshold during the call. The invention is particularly applicable to TETRA and may provide a dynamic trade-off between the speed of encryption re-synchronisation and late entry and the audio quality degradation.
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公开(公告)号：DE60218289T2
公开(公告)日：2007-10-31
申请号：DE60218289
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 , WALTON GLENN BRIAN
Abstract: A method of key distribution includes generating, by a first system device (101), key material and forwarding the key material from the first system device (101) to a second system device (107). It is determined whether a mobile station (401), 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 (115) where the mobile station (401) is active, and the base station (115) forwards the key material to the mobile station (401).
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