Data transmission system

Details Data transmission system Data transmission system

1986-06-20

1988-02-02

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

370106, 375116, 380 21, 380 24, 380 44, 380 45, 380 47, 380 48, H04N 7167, H04L 900, H04D 306

Patent

active

047232838

ABSTRACT:
This invention relates to a data transmission system in which information data is shuffled and the data service is received by those who paid the charges.
According to this data transmission system, a service data and a key code transmitted from a data base station are received by a decoder provided at the side of a subscriber, in which only when these data are decoded and the key code transmitted coincides with a key code at the receiving side, a particular data service transmitted from the data base station can be received by the subscriber.
In the data transmission system of the invention, a control data portion transmitted is shuffled by changing a shuffling pattern by a synchronizing code inserted as part of the control data portion and by arranging the code length of the control data portion to be variable so that the content of data can not be decoded easily.

REFERENCES:
patent: 3649758 (1972-03-01), Clark
patent: 3770897 (1973-11-01), Haussmann et al.
patent: 4322576 (1982-03-01), Miller
patent: 4408203 (1983-10-01), Campbell
patent: 4434323 (1984-02-01), Levine et al.
patent: 4531021 (1985-07-01), Bluestein et al.

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