Cryptography – Video cryptography – Video electric signal modification
Patent
1998-03-03
2000-06-06
Swann, Tod R.
Cryptography
Video cryptography
Video electric signal modification
380200, 380210, 380216, 380269, 380 36, 380 37, 377 42, 377 73, H04N 7167
Patent
active
060728736
ABSTRACT:
In order to implement the Digital Video Broadcasting descrambling algorithm in the context of MPEG compressed data streams containing interleaved sections of scrambled and unscrambled data, at a data rate of 60 MBits/sec with a clock of 2.7 MHz, a stream cipher has an input to receive scrambled video data, and an output coupled to a block cipher for providing descrambled data, the stream cipher comprises shift register means for holding input data coupled to a first mapping logic mechanism comprising at least a first logic means and a second logic means coupled in sequence and arranged to carry out similar logical steps, and the block cipher means comprising shift register means for holding the output of the stream cipher means and a second logic mapping mechanism, comprising at least a first logic means, a second logic means, a third logic means and a fourth logic means coupled in sequence being arranged to carry out similar logical steps.
REFERENCES:
patent: 4547802 (1985-10-01), Fogarty et al.
patent: 4563702 (1986-01-01), Heller et al.
patent: 4581746 (1986-04-01), Arnold
patent: 4646147 (1987-02-01), Krijer
patent: 5509077 (1996-04-01), Mochrmann
patent: 5682425 (1997-10-01), Enari
patent: 5818934 (1998-10-01), Cuccia
patent: 5852663 (1998-12-01), Enari
patent: 5894518 (1999-05-01), Shiojiri
patent: 5920626 (1999-07-01), Durden et al.
Callahan Paul E.
LSI Logic Corporation
Swann Tod R.
LandOfFree
Digital video broadcasting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital video broadcasting, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital video broadcasting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2220936