Patents by Inventor Charles E. Strawbridge

Charles E. Strawbridge 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).

  • Methods for generating variable S-boxes from arbitrary keys of arbitrary length including methods which allow rapid key changes
    Patent number: 5778074
    Abstract: A system for generating variable substitution boxes from arbitrary keys for use in a block cipher system utilizes an initial set of linearly independent numbers to generate substitution tables. The initial set of linearly independent numbers is modulated with the bits of an arbitrary key through operations that result in final sets of linearly independent numbers to form the substitution tables.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: July 7, 1998
    Assignee: Teledyne Industries, Inc.
    Inventors: Knute T. Garcken, Charles E. Strawbridge, Andrew Philip Kisylia