US Patent No: 5,991,405

Number of patents in Portfolio can not be more than 2000

Method for dynamically updating cellular phone unique encryption keys

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Abstract

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In a method for dynamically updating a cellular-phone-unique-encryption key previously stored in, and common to, each of a cellular phone and an associated home location register (HLR) for providing security in a cellular-phone-network operation, a random number and shared secret random data generated at least partly based on the random number are transmitted and verified between the cellular phone and the associated HLR. A previously stored version of the cellular-phone-unique-encryption key is then dynamically updated in both the cellular phone and in the HLR by independent calculations based on an algorithm using the shared secret random data and the previously stored version of the cellular-phone-unique-encryption key. In this manner, the cellular-phone-unique-encryption key is dynamically updated as desired, e.g., each time a user initiates a call, and the latest version of the cellular-phone-unique-encryption key independently calculated by the cellular phone and the HLR is not transmitted during the updating process, thereby substantially eliminating the possibility of the latest version of the cellular-phone-unique-encryption key being intercepted during transmission by unauthorized parties.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DSC TELECOM L.P.PLANO, TX14

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mills, Kevin M Austin, TX 4 104

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CROWLEY, JOHN J. (1)
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FRANCE TELECOM (1)
* 5,661,806 Process of combined authentication of a telecommunication terminal and of a user module 112 1995
 
LG ELECTRONICS INC. (1)
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LUCENT TECHNOLOGIES INC. (1)
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MCAFEE, INC. (1)
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Mita Industrial Co., Ltd. (1)
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MOTOROLA MOBILITY LLC (1)
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MOTOROLA SOLUTIONS, INC. (1)
* 5,325,432 Method for updating encryption key information in communication units 125 1993
 
MOTOROLA, INC. (1)
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NEC CORPORATION (1)
* 5,613,214 Mobile communication terminal authenticating system 29 1994
 
SONY ELECTRONICS INC. (1)
* 5,513,245 Automatic generation of private authentication key for wireless communication systems 66 1994
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (1)
* 5,490,201 Method in conjunction with updating one or more HLR-databases included in a mobile telephone system 30 1993
 
The Exchange System Limited Partnership (1)
* 5,123,047 Method of updating encryption device monitor code in a multichannel data encryption system 11 1991
 
Other [Check patent profile for assignment information] (1)
* 5,655,004 Method and apparatus for detection of cellular phone fraud 25 1995
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (5)
7,591,020 Location based security modification system and method 12 2002
RE43070 Identifying and locating lost or stolen personal digital assistant devices via a landline- or wireless-connected web server 1 2006
8,135,798 Over-the-air device services and management 3 2006
8,086,695 Over the air services for mobile devices 1 2009
8,903,945 Over the air services for mobile devices 0 2011
 
HUAWEI TECHNOLOGIES CO., LTD. (4)
7,650,139 Method for ensuring security of subscriber card 0 2006
* 8,300,827 Method and apparatus for updating key in an active state 0 2010
* 8,023,658 Method and apparatus for updating a key in an active state 2 2010
8,144,877 Method and apparatus for updating a key in an active state 4 2011
 
NOKIA CORPORATION (2)
7,065,340 Arranging authentication and ciphering in mobile communication system 27 2000
* RE39589 Security method for transmissions in telecommunication networks 2 2004
 
ALCATEL (1)
* 6,137,885 Method for enabling direct encrypted communication between two terminals of a mobile radio network, and corresponding station and terminal facilities 18 1998
 
ERICSSON INC. (1)
* 6,671,377 System and method for downloading network information to mobile stations for location calculation 45 1999
 
HELLA KGAA (1)
* 2012/0045,058 APPARATUS AND METHOD FOR AUTHENTICATION FOR MOTOR VEHICLES 0 2011
 
Kohler Co. (1)
7,669,577 Gerotor and method of assembling the same 0 2008
 
LENOVO INTERNATIONAL LIMITED (1)
7,934,104 Systems and methods for verifying a licensed installation at time of update 0 2006
 
LG ELECTRONICS INC. (1)
* 6,839,553 Method of managing mobile station operational parameters 11 2002
 
NOKIA SIEMENS NETWORKS GMBH & CO. KG (1)
* 7,526,273 Method and apparatus to counter the rogue shell threat by means of local key derivation 0 2001
 
SAMSUNG ELECTRONICS CO., LTD. (1)
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SYMANTEC CORPORATION (1)
* 8,478,998 Authenticated communication using a shared unpredictable secret 0 2006
* Cited By Examiner