Cryptography – Cryptanalysis
Patent
1996-09-04
1998-06-30
Buczinski, Stephen C.
Cryptography
Cryptanalysis
380 5, 380 10, 380 20, H04K 102, H04N 7167
Patent
active
057745480
ABSTRACT:
An arrangement to automatically change between a scrambled digital data output and descrambled digital data output of a receiver by inserting a control signal conforming to a program provider's policy into a transmission signal. In a receiving side, a descrambler descrambles a channel-decoded signal, a demultiplexer demultiplexes the multiplexed signal from the descrambler into encoded video and audio data for output to a source decoder, and extracts the control information inserted in the transmitting side for output to a switch or CPU. The CPU decrypts a control signal from the control information extracted by the demultiplexer to determine whether the scrambled digital signal or descrambled digital signal is appropriate for output, and outputs a changeover control signal depending on the result of decryption. A switch selects the output of a scrambled digital signal from a stage prior to the descrambler, or a descrambled digital signal from a stage subsequent to the descrambler, depending on the changeover control signal from the CPU. Thereby, a scrambled digital signal output or descrambled digital signal output can automatically be changed over depending on a program provider's policy.
REFERENCES:
patent: 4471380 (1984-09-01), Mobley
patent: 4821260 (1989-04-01), Klank et al.
patent: 5509073 (1996-04-01), Monnin
Bando Yumi
Eda Takanori
Imuro Satoshi
Katsumata Kenji
Murata Toshinori
Buczinski Stephen C.
Hitachi , Ltd.
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