US Patent No: 6,240,187

Number of patents in Portfolio can not be more than 2000

Key replacement in a public key cryptosystem

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Abstract

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Improved key management is provided by a public key replacement apparatus and method for operating over insecure networks. An active public key and the mask of a replacement public key are provided by a key server to nodes where the active key is used to encrypt and verify messages. To replace the active public key with the replacement public key, a key replacement message is sent to the node. The key replacement message contains the replacement public key and contains the mask of the next replacement key. The mask of the replacement public key may be generated by hashing or encrypting. The key replacement message is signed by the active public key and the replacement public key. Nodes are implemented by a computer, a smart card, a stored data card in combination with a publicly accessible node machine, or other apparatus for sending and/or receiving messages. In a particular application, a financial transaction network, nodes are consumer nodes, merchant nodes, or both, and transactions are securely sent over a possible insecure network

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VISA INTERNATIONAL SERVICE ASSOCIATIONSAN FRANCISCO, CA268

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lewis, Tony Hayward, CA 4 345

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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VOICE SIGNALS LLC (1)
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Other [Check patent profile for assignment information] (2)
4,926,478 Method and apparatus for continuously acknowledged link encrypting 19 1988
5,956,407 Public key cryptographic system having nested security levels 31 1997

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
XATRA FUND MX, LLC (37)
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7,059,531 Method and system for smellprint recognition biometrics on a fob 19 2004
7,172,112 Public/private dual card system and method 56 2004
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7,228,155 System and method for remotely initializing a RF transaction 74 2004
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8,284,025 Method and system for auditory recognition biometrics on a FOB 0 2007
8,279,042 Iris scan biometrics on a payment device 2 2007
7,690,577 Registering a biometric for radio frequency transactions 5 2007
7,506,819 Biometric security using a fob 9 2007
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III HOLDINGS 1, LLC (30)
8,429,041 Systems and methods for managing account information lifecycles 0 2003
8,543,423 Method and apparatus for enrolling with multiple transaction environments 0 2003
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7,827,106 System and method for manufacturing a punch-out RFID transaction device 1 2003
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7,542,942 System and method for securing sensitive information during completion of a transaction 17 2004
7,503,480 Method and system for tracking user performance 6 2004
7,463,133 Systems and methods for providing a RF transaction device operable to store multiple distinct calling card accounts 2 2004
7,835,960 System for facilitating a transaction 9 2004
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7,762,457 System and method for dynamic fob synchronization and personalization 3 2004
7,587,756 Methods and apparatus for a secure proximity integrated circuit card transactions 10 2004
7,805,378 System and method for encoding information in magnetic stripe format for use in radio frequency identification transactions 2 2004
7,996,324 Systems and methods for managing multiple accounts on a RF transaction device using secondary identification indicia 9 2004
8,635,131 System and method for managing a transaction protocol 0 2004
8,538,863 System and method for facilitating a transaction using a revolving use account associated with a primary account 0 2004
7,156,301 Foldable non-traditionally-sized RF transaction card system and method 52 2005
7,429,927 System and method for providing and RFID transaction device 3 2005
7,543,738 System and method for secure transactions manageable by a transaction account provider 18 2005
7,650,314 System and method for securing a recurrent billing transaction 4 2005
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7,837,116 Transaction card 2 2007
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7,793,845 Smartcard transaction system and method 2 2009
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8,266,056 System and method for manufacturing a punch-out RFID transaction device 0 2010
8,191,788 Transaction card 7 2010
 
SECURITY FIRST CORP. (23)
7,260,724 Context sensitive dynamic authentication in a cryptographic system 55 2000
7,391,865 Secure data parser method and system 44 2003
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8,135,134 Systems and methods for managing cryptographic keys 2 2008
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8,656,167 Systems and methods for secure workgroup management and communication 0 2009
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8,654,971 Systems and methods for securing data in the cloud 0 2010
8,214,650 Context sensitive dynamic authentication in a cryptographic system 2010
8,745,372 Systems and methods for securing data in motion 1 2010
8,650,434 Systems and methods for securing data in motion 0 2011
8,601,498 Accelerator system for use with secure data storage 0 2011
8,320,560 Secure data parser method and system 3 2011
8,769,270 Systems and methods for secure data sharing 0 2011
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8,769,699 Secure data parser method and system 0 2012
8,726,033 Context sensitive dynamic authentication in a cryptographic system 0 2012
8,745,379 Systems and methods for securing data in motion 1 2012
 
SUN MICROSYSTEMS, INC. (3)
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MOTOROLA MOBILITY LLC (2)
7,421,083 System for seamlessly updating service keys with automatic recovery 2 2002
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PITNEY BOWES INC. (2)
6,473,743 Postage meter having delayed generation of cryptographic security parameters 16 1999
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VISA U.S.A. INC. (2)
7,702,916 Method and system for secure authentication 3 2004
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ALCATEL-LUCENT USA INC. (1)
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ASSA ABLOY AB (1)
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PAXERA CORP. (1)
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SYMANTEC CORPORATION (1)
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VISA INTERNATIONAL SERVICE ASSOCIATION (1)
8,707,319 Resource location verification by comparing and updating resource location with a location of a consumer device after a threshold of location mismatches is exceeded 0 2009
 
Other [Check patent profile for assignment information] (2)
7,734,527 Method and apparatus for making secure electronic payments 9 2002
8,898,464 Systems and methods for secure workgroup management and communication 0 2013