Patents by Inventor Jeroen Döll

Jeroen Döll 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).

  • Protectedly reading out an enciphered, cryptographic key
    Patent number: 6775773
    Abstract: Method and apparatuses for protectedly reading out an enciphered, cryptographic key (Ksec) stored in a first memory (2) of a first communication apparatus (8; 8′), comprising the following steps: a. making available a first predetermined number (PW; X) by the first communication apparatus (8; 8′); b. receiving the first predetermined number (PW; X) by the second communication apparatus; c. calculating a Message Authentication Code (MAC) by the second communication apparatus on a second predetermined number, using the first predetermined number (PW; X), and with the aid of a predetermined key (Kicc); d. making available the Message Authentication Code by the second communication apparatus (6; 13); e. deciphering the cryptographic key by the first communication apparatus (8; 8′), using the Message Authentication Code as a deciphering key.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: August 10, 2004
    Assignee: Koninklijke KPN N.V.
    Inventors: Frank Fransen, Reinder Wolthuis, Jeroen Döll