Patents by Inventor Gary L. Friedman

Gary L. Friedman 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: 5499294
    Abstract: A digital camera equipped with a processor for authentication of images produced from an image file taken by the digital camera is provided. The digital camera processor has embedded therein a private key unique to it, and the camera housing has a public key that is so uniquely related to the private key that digital data encrypted with the private key may be decrypted using the public key. The digital camera processor comprises means for calculating a hash of the image file using a predetermined algorithm, and second means for encrypting the image hash with the private key, thereby producing a digital signature. The image file and the digital signature are stored in suitable recording means so they will be available together. Apparatus for authenticating the image file as being free of any alteration uses the public key for decrypting the digital signature, thereby deriving a secure image hash identical to the image hash produced by the digital camera and used to produce the digital signature.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: March 12, 1996
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Gary L. Friedman
  • Patent number: 4847837
    Abstract: A redundant error-detecting and correcting local area networked computer system (10) having a plurality of nodes (16) each including a network connector board (20') for connecting to an interfacing transceiver (18) attached to a network cable (12, 14). The system comprises a first network cable (12) disposed along a path to interconnect the nodes. The first cable includes a plurality of first interfacing transceivers. A second network cable (14) includes a plurality of second interfacing transceivers. A plurality of three position switches (48) each having a signal input, three outputs for individual selective connection to the input, and a control input for receiving signals designating which of the outputs is to be connected to the signal input are provided. Master switch (50) is provided for receiving directive signals for outputting addressed switch position signals to the three position switches.
    Type: Grant
    Filed: November 7, 1986
    Date of Patent: July 11, 1989
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Sergio Morales, Gary L. Friedman