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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VISA INTERNATIONAL SERVICE ASSOCIATIONSAN FRANCISCO, CA251

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lewis, Tony Hayward, CA 4 335

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
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Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
XATRA FUND MX, LLC (35)
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7,303,120 System for biometric security using a FOB 50 2004
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7,059,531 Method and system for smellprint recognition biometrics on a fob 18 2004
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7,228,155 System and method for remotely initializing a RF transaction 71 2004
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8,074,889 System for biometric security using a fob 3 2007
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7,637,434 Registering a biometric for radio frequency transactions 2 2007
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8,279,042 Iris scan biometrics on a payment device 2 2007
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7,506,819 Biometric security using a fob 9 2007
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III HOLDINGS 1, LLC (30)
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7,070,112 Transparent transaction device 48 2004
7,542,942 System and method for securing sensitive information during completion of a transaction 15 2004
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7,463,133 Systems and methods for providing a RF transaction device operable to store multiple distinct calling card accounts 2 2004
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7,762,457 System and method for dynamic fob synchronization and personalization 2 2004
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7,996,324 Systems and methods for managing multiple accounts on a RF transaction device using secondary identification indicia 8 2004
8,635,131 System and method for managing a transaction protocol 0 2004
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7,156,301 Foldable non-traditionally-sized RF transaction card system and method 49 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 17 2005
7,650,314 System and method for securing a recurrent billing transaction 2 2005
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7,837,116 Transaction card 2 2007
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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 6 2010
 
SECURITY FIRST CORP. (24)
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7,577,621 Cryptographic server with provisions for interoperability between cryptographic systems 5 2004
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8,135,134 Systems and methods for managing cryptographic keys 1 2008
8,473,756 Systems and methods for securing data using multi-factor or keyed dispersal 1 2009
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8,494,969 Cryptographic server with provisions for interoperability between cryptographic systems 0 2009
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 0 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 2 2011
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8,787,583 Systems and methods for distributing and securing data 0 2012
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8,726,033 Context sensitive dynamic authentication in a cryptographic system 0 2012
8,745,379 Systems and methods for securing data in motion 0 2012
 
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7,363,499 Blinded encryption and decryption 4 2003
 
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MOTOROLA MOBILITY LLC (2)
7,421,083 System for seamlessly updating service keys with automatic recovery 2 2002
8,364,964 Registering client devices with a registration server 0 2009
 
PITNEY BOWES INC. (2)
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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)
7,085,386 System and method for secure replacement of high level cryptographic keys in a personal security device 20 2001
 
C4 TECHNOLOGY INC. (1)
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7,822,207 Key protection mechanism 2 2006
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
7,499,552 Cipher method and system for verifying a decryption of an encrypted user data key 3 2006
 
MOTOROLA SOLUTIONS, INC. (1)
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NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
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PAXERA CORP. (1)
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SYMANTEC CORPORATION (1)
7,054,447 Method and apparatus for periodically removing invalid public keys from a public key server 8 2000
 
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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] (1)
7,734,527 Method and apparatus for making secure electronic payments 6 2002

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