Method for dynamically updating cellular phone unique encryption keys

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5991405
SERIAL NO

09014121

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ATTORNEY / AGENT: (SPONSORED)

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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 4 124

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Other [Check patent profile for assignment information] (1)
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MCAFEE, INC. (1)
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HELLA KGAA (2)
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* 2012/0045,058 APPARATUS AND METHOD FOR AUTHENTICATION FOR MOTOR VEHICLES 1 2011
 
QUALCOMM INCORPORATED (7)
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8086695 Over the air services for mobile devices 1 2009
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KOHLER CO. (1)
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HUAWEI TECHNOLOGIES CO., LTD. (9)
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* 2007/0105,530 Method for Ensuring Security of Subscriber Card 2 2006
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* 2010/0202,618 Method and apparatus for updating key in an active state 12 2010
* 8023658 Method and apparatus for updating a key in an active state 6 2010
8144877 Method and apparatus for updating a key in an active state 18 2011
* 9031240 Method and apparatus for updating a key in an active state 8 2012
* 2012/0307,803 METHOD AND APPARATUS FOR UPDATING A KEY IN AN ACTIVE STATE 5 2012
* 2015/0208,240 METHOD AND APPARATUS FOR UPDATING A KEY IN AN ACTIVE STATE 2 2015
 
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mSAFE Ltd. (1)
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NOKIA CORPORATION (2)
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* Cited By Examiner