US Patent No: 6,411,716

Number of patents in Portfolio can not be more than 2000

Method of changing key fragments in a multi-step digital signature system

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Abstract

A multi-step digital signature system and method is provided having a distributed root certifying authority 20. Messages received at the root certifying authority 20 are distributed to root certifying authority members 22-30 who attach partial signatures to the message using root key fragments. In the system and method provided, the system adapts to system events such as the addition or removal of key fragment holders, the need to modify key fragments, etc., by changing key fragments.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CERTCO, INC.NEW YORK, NY25

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brickell, Ernest F Albuquerque, NM 21 402

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,164,988 Method to establish and enforce a network cryptographic security policy in a public key cryptosystem 167 1991
5,625,692 Method and system for a public key cryptosystem having proactive, robust, and recoverable distributed threshold secret sharing 45 1995
 
CERTCO, INC. (1)
5,315,658 Fair cryptosystems and methods of use 143 1993
 
Entrust Technologies Limited (1)
5,481,613 Computer network cryptographic key distribution system 87 1994
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
5,224,163 Method for delegating authorization from one entity to another through the use of session encryption keys 274 1990
 
MICALI, SILVIO (1)
5,276,737 Fair cryptosystems and methods of use 124 1992
 
WISCONSIN ALUMNI RESEARCH FOUNDATION (1)
4,417,338 Cryptographic key sharing circuit and method using code correction 21 1981
 
Other [Check patent profile for assignment information] (1)
5,005,200 Public key/signature cryptosystem with enhanced digital signature certification 343 1989

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
SECURITY FIRST CORP. (6)
7,187,771 Server-side implementation of a cryptographic system 21 2000
8,266,438 Secure data parser method and system 0 2005
8,135,134 Systems and methods for managing cryptographic keys 1 2008
8,320,560 Secure data parser method and system 2011
8,271,802 Secure data parser method and system 2012
8,332,638 Secure data parser method and system 0 2012
 
NTT DOCOMO, INC. (5)
7,533,270 Signature schemes using bilinear mappings 4 2003
7,853,016 Signature schemes using bilinear mappings 0 2007
7,814,326 Signature schemes using bilinear mappings 1 2007
7,653,817 Signature schemes using bilinear mappings 0 2007
8,180,049 Signature schemes using bilinear mappings 0 2010
 
PITNEY BOWES INC. (4)
6,847,951 Method for certifying public keys used to sign postal indicia and indicia so signed 2 1999
6,738,899 Method for publishing certification information certified by a plurality of authorities and apparatus and portable data storage media used to practice said method 3 1999
6,704,867 Method for publishing certification information representative of selectable subsets of rights and apparatus and portable data storage media used to practice said method 4 1999
6,868,407 Postage security device having cryptographic keys with a variable key length 9 2000
 
STRAGENT, LLC (3)
8,204,945 Hash-based systems and methods for detecting and preventing transmission of unwanted e-mail 0 2008
8,272,060 Hash-based systems and methods for detecting and preventing transmission of polymorphic network worms and viruses 2010
8,166,549 Hash-based systems and methods for detecting and preventing transmission of polymorphic network worms and viruses 0 2010
 
BIO-KEY INTERNATIONAL, INC. (2)
7,454,624 Match template protection within biometric security systems 3 2003
7,502,938 Trusted biometric device 0 2003
 
CERTICOM CORP. (2)
8,457,307 Method and system for generating implicit certificates and applications to identity-based encryption (IBE) 0 2008
8,069,347 Method for the application of implicit signature schemes 0 2008
 
MICROSOFT CORPORATION (2)
7,716,243 Provisions for validating content using a content registration authority 5 2005
8,112,444 Provisions for validating content using a content registration authority 0 2010
 
ARCHITECTURE TECHNOLOGY CORPORATION (1)
8,015,211 Secure peer-to-peer object storage system 1 2004
 
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY (1)
7,685,425 Server computer for guaranteeing files integrity 8 2000
 
CORESTREET, LTD. (1)
7,822,989 Controlling access to an area 2 2004
 
CP8 TECHNOLOGIES (1)
7,260,727 Method for secure storage of sensitive data in a memory of an embedded microchip system, particularly a smart card, and embedded system implementing the method 2 2001
 
EMC CORPORATION (1)
7,136,489 Method and system for enhancing network security using a multilateral authorization mechanism 9 2002
 
FELSHER, DAVID P., MR. (1)
7,181,017 System and method for secure three-party communications 229 2002
 
FRANCE TELECOM (1)
7,673,144 Cryptographic system for group signature 1 2002
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
8,271,791 Long-term secure digital signatures 2008
 
MCAFEE, INC. (1)
6,922,776 Scalable system and method for management and notification of electronic certificate changes 14 2001
 
NCR CORPORATION (1)
7,548,621 System and method for securing a base derivation key for use in injection of derived unique key per transaction devices 0 2002
 
NTT COMMUNICATIONS CORPORATION (1)
8,085,938 Secret information management scheme based on secret sharing scheme 0 2005
 
SAC TECHNOLOGIES, INC. (1)
6,895,104 Image identification system 19 2001
 
THOMSON LICENSING (1)
7,861,084 Authentication of data transmitted in a digital transmission system 0 2006
 
XILINX, INC. (1)
6,839,879 Method and system for time-stamping and managing electronic documents 6 1999

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
11.5 Year Payment $7400.00 $3700.00 $1850.00 Dec 25, 2013
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Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00