Cryptography – Communication system using cryptography – Pseudo-random sequence scrambling
Reexamination Certificate
2005-05-03
2005-05-03
Barrón, Gilberto (Department: 2132)
Cryptography
Communication system using cryptography
Pseudo-random sequence scrambling
C380S217000, C380S213000, C380S210000, C380S215000, C327S371000
Reexamination Certificate
active
06888943
ABSTRACT:
A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable, or otherwise provided at a desired quality level. The samples may be in any conceivable compressed or uncompressed digital format, including Pulse Code Modulation (PCM) samples, samples in floating point representation, samples in companding schemes (e.g., μ-law and A-law), and other compressed bit streams. The quality level may be associated with a particular signal to noise ratio, or quality level that is determined by objective and/or subjective tests, for example. A number of LSBs can be scrambled in successive samples in successive frames (FRAME A, FRAME B, FRAME C). Moreover, the parameters for scrambling may change from frame to frame. Furthermore, all or part of the scrambling key (310) can be embedded (340) in the scrambled data and recovered at a decoder (400, 600) to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.
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Endoh Naoki
Katoh Taku
Lam Katherine S.
Lee Chong U.
Moallemi Kamran
Barrón Gilberto
Lanier Benjamin E.
Lipsitz Barry R.
McAllister Douglas M.
Verance Corporation
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