Process for the broadcasting and reception of access title contr

Details Process for the broadcasting and reception of access title contr Process for the broadcasting and reception of access title contr

1989-05-12

1990-08-07

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 13, H04K 100

Patent

active

049474286

ABSTRACT:
According to the invention, the control messages are constituted by a general addressing message (GCM), followed by shared addressing messages (SACM). The message (GCM) contains all the information common to all the user groups and a confirmation data item of the group of users and the messages (SACM) a shared address. Thus, the group is defined in a manner inherent in the control messages and can undergo reconfiguration at any time.
Application to more particularly satellite broadcasting of television programmes.

REFERENCES:
patent: 4253114 (1981-02-01), Tang et al.
patent: 4292650 (1981-09-01), Hendrickson
patent: 4864614 (1989-09-01), Crowther

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