Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-08-16
1996-05-07
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
348403, 380 10, 380 14, H04N 7167
Patent
active
055154379
ABSTRACT:
The occurrence of malfunction on the reproduction side is avoided by preventing a scrambled signal from being coincided with a reserved word in the signal when a scramble process is carried out in order to release a transmission signal to specific users. The scramble process includes at least one of methods of (1) bit-inverting specified codes of the transmission signal code by code, (2) limiting bits to be scrambled from a specified position in the transmission signal, and (3) limiting codes to be scrambled to specific codes.
REFERENCES:
patent: 4771458 (1988-09-01), Citta et al.
patent: 5208857 (1993-05-01), Lebrat
patent: 5216712 (1993-06-01), Shimoda et al.
patent: 5384849 (1995-01-01), Jeong
"A Scrambling System for Communication Satellite Television", Toshikazu Nezu, et al. ITEJ Technical Report, vol. 15 No. 14, pp. 1-6, Feb. 1991.
"Information Technology--Generic Coding of Moving Pictures and Associated Audio", ISO-IEC 13818-2 Committee Draft, Nov. 5, 1993.
"Information Technology--Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1,5 Mbit/s", ISO/IEC 11172-2, 1993.
Ibaraki Susumu
Katta Noboru
Murakami Hiroki
Nakamura Seiji
Buczinski Stephen C.
Matsushita Electric - Industrial Co., Ltd.
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