Cryptography – Key management – Having particular key generator
Patent
1991-04-24
1993-05-04
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 10, 380 36, 380 49, 380 50, H04N 7167
Patent
active
052088570
ABSTRACT:
A method and device are disclosed for scrambling-unscrambling digital image data. The data is subjected to processing for extracting the colorimetric components of the pixels forming the image, the components being formed into blocks b(I,J) of N.times.N pixels x(i,j) so as to generate corresponding spatial chopping of the image where I designates a line index and J a column index of arrangement of the blocks in the image, i and j designating a line index and a column index of arrangement of the pixels in each block. The pixels and/or blocks are subjected to an intra-block and/or inter-block mixing procedure. The inter-block mixing consists of an arbitrary re-arrangement of said blocks of pixels and the intra-block mixing mixing consists of an arbitrary re-arrangement of the pixels os each block so as to obtain a scrambled arrangement of blocks and/or pixels.
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Symposium Record, Broadcast Sessions, 16th International TV Symposium, Montreux, Jun. 17-22, 1989, pp. 387-409 Grotz et al. "Image coding techniques for 64 kbits/s channels".
Document CMTT/303-E (11/733-E), Oct. 17, 1989; Comite Consultatif International des Radiocommunications.
Gregory Bernarr E.
Telediffusion de France
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