Patents by Inventor Maria L. Wenas

Maria L. Wenas 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).

  • Method for authenticating communications participants, system for application of the method and first communications participant and second communication participant for application in the system
    Patent number: 5325434
    Abstract: Known methods for authenticating communication participants add a code word to a command signal, which code word is a crytographic function of the command signal and a key value which in its turn is a function of a master key value and a change code word. The master key value has a permanently fixed value, in contrast to the change code word which serves to change the key value. The method according to the invention makes use of a key value which is a function of at least one previous key value, the master key value with the permanently fixed value, which, once it has been discovered or leaked, substantially weakens the encryption, no longer being required.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: June 28, 1994
    Assignee: Koninklijke PTT Nederland N.V.
    Inventors: Jurgen J. Spaanderman, Klaas P. Vlieg, Maria L. Wenas