Patents by Inventor Warwick Stanley Ford

Warwick Stanley Ford 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).

  • Encryption system for mixed-trust environments
    Patent number: 5949883
    Abstract: Encryption frequently needs to be used in communication networks which span different geographical regions which can be considered to be trusted to different extents. According to one embodiment, the invention uses both a strong encryption algorithm and a weak encryption algorithm. A device in the high-trusted region can encrypt using the strong algorithm and can decrypt using either the strong or weak algorithm. A device in the low-trusted region can decrypt with either the strong or the weak algorithm but can encrypt only with the weak algorithm.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: September 7, 1999
    Assignee: Entrust Technologies Ltd.
    Inventor: Warwick Stanley Ford