Patents by Inventor Lawrence R. Cook

Lawrence R. Cook 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).

  • Countermeasure to power attack and timing attack on cryptographic operations
    Patent number: 6804782
    Abstract: A cryptography circuit provides secure processing of data by utilizing countermeasures that combat timing and power attacks. Superfluous operations such as multiplication operations, modular reductions by an integer, storage of data to memory are available for use by a processor to disguise the amount of power usage and the amount of time required to perform a cryptographic operation. A cryptographic key is available for use in order to trigger when these emulated operations occur. The occurrences of the emulated operations is controlled by the user to provide the preferred tradeoff between security and use of resources.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: October 12, 2004
    Assignee: General Instrument Corporation
    Inventors: Xin Qiu, Eric J. Sprunk, Daniel Z. Simon, Lawrence Tang, Lawrence R. Cook