Video scrambling apparatus and method based on space filling curves
AssigneeYeda Research and Development Co. Ltd.
InventorsYossi Matias, Adi Shamir
Life of this patent
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Abstract
A method of encrypting a video signal employing a pseudo-random 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.
Claims19
A method of encrypting a video signal comprising the steps of:
- storing in the locations of a frame buffer the pixel values of a group of video information lines representing at least a portion of a video picture contained in the video signal;
- defining a pseudo-random Space Filling Curve (SFC), being a Hamiltonian path and providing a sequence corresponding to locations of the frame buffer mapping random directions of movement between adjacent pixels of the video picture portion;
- and
- addressing the locations of the frame buffer in accordance with the defined sequence to read the pixel values thereof for encrypted transmission of the video signal.
Dependencies are inferred from the claim text.