Patents by Inventor Bernard J. Chorley

Bernard J. Chorley 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).

  • Patent number: 4634807
    Abstract: In order to prevent the unauthorized copying of software, a software module is encrypted using the data encryption standard (DES) algorithm, and the key is encrypted using the public key of a public/private key algorithm. To use the module it is entered into a software protection device where the private key held in a RAM 11 is used by a processor 13 to decode the DES key using instructions held in a ROM 12. Further instructions held by this ROM are used by the processor 13 to decode the module. Once the process of decoding keys and software has started, the processor 13 runs through a sequence of predetermined instructions and cannot be interrupted (except by switching off). When the sequence is complete processor 13, or for example a host computer 30, is enabled to use the decoded software, but a switch/reset circuit 17 operates preventing access to the RAM 11 and the ROM 12 so preserving the secrecy of the private key and any decoded DES key which is now stored in the RAM 11.
    Type: Grant
    Filed: August 23, 1985
    Date of Patent: January 6, 1987
    Assignee: National Research Development Corp.
    Inventors: Bernard J. Chorley, Graeme I. P. Parkin, Brian A. Wichmann, Simon M. Elsom