Patents by Inventor David M. Kristol

David M. Kristol has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7023998
    Abstract: A method and apparatus enhancing the security of an encrypted cryptographic key by storing its key re-transforming information in a decryption store that is separate from a cryptographic key store, which stores the encrypted cryptographic key, from which accessing circuitry is able to access the encrypted cryptographic key. The cryptographic key store may be a disk drive of a computer, the decryption store may be a network access card installed in that computer or a mobile terminal coupled to that computer, and the accessing circuitry may be the computer's controller. Decryption of the encrypted cryptographic key is carried out in the decryption store, as is the subsequent encryption or decryption using the decrypted cryptographic key.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: April 4, 2006
    Assignee: Lucent Technologies Inc.
    Inventors: Juan A. Garay, Bjorn M. Jakobsson, David M. Kristol, Semyon B. Mizikovsky
  • Publication number: 20020141589
    Abstract: A method and apparatus enhancing the security of an encrypted cryptographic key by storing its key re-transforming information in a decryption store that is separate from a cryptographic key store, which stores the encrypted cryptographic key, from which accessing circuitry is able to access the encrypted cryptographic key. The cryptographic key store may be a disk drive of a computer, the decryption store may be a network access card installed in that computer or a mobile terminal coupled to that computer, and the accessing circuitry may be the computer's controller. Decryption of the encrypted cryptographic key is carried out in the decryption store, as is the subsequent encryption or decryption using the decrypted cryptographic key.
    Type: Application
    Filed: March 30, 2001
    Publication date: October 3, 2002
    Inventors: Juan A. Garay, Bjorn M. Jakobsson, David M. Kristol, Semyon B. Mizikovsky
  • Patent number: 5799092
    Abstract: A self-verifying identification card having an image area which may contain a portrait, a finger print, a retinal image, or all of these together with an image signature which is derived from scanned intensity measurements taken from the image area. In the verification process, the image is scanned and aligned with respect to reference points corresponding to the original printing process which created the card, and intensity values, their averages, or any other function are compared to information provided by the image signature. Mathematical transformations, such as a one-way hash, an encryption, a compression algorithm, or a truth table may be used to encode the image signature. Alignment markers aid in scanning the image and the image signature. The use of average values aids in reducing noise and the use of comparison functions makes the process less sensitive to variations among scanners.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: August 25, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: David M. Kristol, Lawrence P. O'Gorman
  • Patent number: 5668874
    Abstract: A self-verifying identification card having an image area which may contain a portrait, a finger print, a retinal image, or all of these together with an image signature which is derived from scanned intensity measurements taken from the image area. In the verification process, the image is scanned and aligned with respect to reference points corresponding to the original printing process which created the card, and intensity values, their averages, or any other function are compared to information provided by the image signature. Mathematical transformations, such as a one-way hash, an encryption, a compression algorithm, or a truth table may be used to encode the image signature. Alignment markers aid in scanning the image and the image signature. The use of average values aids in reducing noise and the use of comparison functions makes the process less sensitive to variations among scanners.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: September 16, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: David M. Kristol, Lawrence P. O'Gorman
  • Patent number: 5541927
    Abstract: A method of network multicasting using transport layer protocols, suitable for use in ATM networks, is disclosed. The protocols advantageously combine the acknowledgments of individual destinations along the underlying multicast tree to prevent acknowledgement implosion. The inventive method also prevents unnecessary retransmission by performing local multicasts.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: July 30, 1996
    Assignee: AT&T Corp.
    Inventors: David M. Kristol, Sanjoy Paul, Krishan K. Sabnani