Method and device for scrambling and descrambling of a specific

Details Method and device for scrambling and descrambling of a specific Method and device for scrambling and descrambling of a specific

1994-03-29

1996-12-24

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 16, 348 10, 348 55, H04N 7167

Patent

active

055880584

ABSTRACT:
A receiving device comprises a pseudo-random generator (18) initialized by a control word (CW) and a memory card reader (19). In accordance with the invention, it reads control word in a table of numbers contained in a read-only memory of a memory card (17) by utilizing a mode which is chosen from among several different modes, receives from the transmitter a signal which indicates the choice made in respect of said mode at a given instant.

REFERENCES:
patent: 5029207 (1991-07-01), Gammie
patent: 5105268 (1992-04-01), Yamanouchi et al.
patent: 5134656 (1992-07-01), Kudelski
patent: 5367571 (1994-11-01), Bowen et al.

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