Patents Assigned to Yossi Matias
  • Video scrambling apparatus and method based on space filling curves
    Patent number: 5058158
    Abstract: A method of encrypting a video signal employing a pseudorandom Space Filling Curve having a highly irregular scanning pattern for scanning the pixel addresses of a video picture stored in a frame buffer. The method is used with a video scrambler/descrambler device and is characterized by a much higher cryptographic strength than existing techniques, which is not subject to simple correlation attacks by comparing and matching of line portions. In addition, the method features a reduction in the video signal bandwidth for typical pictures.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: October 15, 1991
    Assignee: Yossi Matias
    Inventors: Yossi Matias, Adi Shamir