Cryptography – Key management – Having particular key generator
Patent
1992-03-27
1994-04-05
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 20, H04K 100
Patent
active
053012453
ABSTRACT:
A CATV system includes a broadcasting station, a satellite, and a local center. Scrambled television signals transmitted from the broadcasting station to the local center through the satellite are descrambled and re-scrambled at the local center, and the re-scrambled TV signals are transmitted to terminal devices. A non-scrambled TV signal included in the TV signal transmitted from the broadcasting station to the local center is detected. The detected non-scrambled TV signal is transmitted to terminal devices without scrambling.
REFERENCES:
patent: 4330794 (1982-05-01), Sherwood
patent: 4648123 (1987-03-01), Schrock
patent: 4665427 (1987-05-01), Beckley et al.
patent: 4672440 (1987-06-01), Trahan
patent: 4980912 (1990-12-01), Welmer
patent: 5138659 (1992-08-01), Kelkar et al.
"Videocipher Secure Television Scrambling Systems" General Instruments (Feb. 1, 1987) pp. 1-8.
Cangialosi Salvatore
Pioneer Electronic Corporation
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