Patents by Inventor Rotislaw Prymak

Rotislaw Prymak 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).

  • Secure translation of usage-control values for cryptographic keys
    Patent number: 5177791
    Abstract: A working key of a certain key type is to be transmitted from a first system (having a first usage-control value associated with keys of the certain type) and a second system (having a second usage-control value associated with keys of the certain type). A translation control value, associated with the certain key type, is generated, functionally relating the first and second usage-control values. The translation control value is used in a cryptographic function to send or receive the working key between systems, the cryptographic function being designed to produce valid results when the correct translation control value, and usage-control values, are employed, and unpredictable results otherwise. Effectively, the first usage-control value is translated to the second usage-control value.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: January 5, 1993
    Assignee: International Business Machines Corp.
    Inventors: Phil C. Yeh, Dennis G. Abraham, Donald B. Johnson, An Van Le, Stephen M. Matyas, Rotislaw Prymak, Ronald M. Smith, Sr., John D. Wilkins