Patents by Inventor Stefanus Alfonsus Brands

Stefanus Alfonsus Brands 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 cryptographic methods for electronic transfer of information
    Patent number: 5696827
    Abstract: Cryptographic methods and apparatus are disclosed relating to practical cryptographic systems for electronic transfer of information. Specifically, inventive techniques are described to allow the use of tamper-resistant computing devices without powerful processors; to guarantee security against criminals able to gain full control over computing devices of other parties; to allow value in privacy-protected off-line cash systems to be represented by counters instead of digital coins, without significantly compromising security against criminals who can by-pass tamper-resistance; and to allow secure currency conversion in privacy-protected off-line cash systems, without requiring tamper-resistance for receiver parties.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: December 9, 1997
    Inventor: Stefanus Alfonsus Brands
  • Secure cryptographic methods for electronic transfer of information
    Patent number: 5668878
    Abstract: Cryptographic methods and apparatus are disclosed relating to practical cryptographic systems for electronic transfer of information. Specifically, inventive techniques are described to allow the use of tamper-resistant computing devices without powerful processors; to guarantee security against criminals able to gain full control over computing devices of other parties; to allow value in privacy-protected off-line cash systems to be represented by counters instead of digital coins, without significantly compromising security against criminals who can by-pass tamper-resistance; and to allow secure currency conversion in privacy-protected off-line cash systems, without requiring tamper-resistance for receiver parties.
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: September 16, 1997
    Inventor: Stefanus Alfonsus Brands