Process for the transmission and reception of conditional access

Details Process for the transmission and reception of conditional access Process for the transmission and reception of conditional access

1994-12-20

1997-03-25

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 14, H04N 7167

Patent

active

056152655

ABSTRACT:
Process for the transmission and reception of conditional access programs controlled by the same operator.
According to the invention, specific check words (MCSi) are formed for various programs of the same operator from a root check word individual to said operator. The check words of the access titles include a part which is common to all the programs controlled by the same operator and a part which is specific to each program.
Uses in television, radio, data transmission, messaging, etc.

REFERENCES:
patent: 4947428 (1990-08-01), Guillou et al.
patent: 5224161 (1993-06-01), Daniel et al.
patent: 5349641 (1994-09-01), Coutrot et al.

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