System for encoding data presented with a first coding device an

Details System for encoding data presented with a first coding device an System for encoding data presented with a first coding device an

1992-12-11

1994-01-11

Swann, Tod R.

Cryptography

Key management

Having particular key generator

380 50, 380 43, H04K 100

Patent

active

052789063

ABSTRACT:
In a system for de-/encoding data using (de)coding devices at either end of a transmission channel, the data sometimes comprise additional synchronisation information which is used to reduce the effect of faults in the transmission channel. If this synchronisation information is not already present, it is impossible in certain cases to add such information. The invention provides a system which, regardless of the presence of additional synchronisation information, is able to reduce the effect of faults. For this purpose, each (de)coding device is provided with means for comparing sequences of encoded data with at least one predetermined code word and for setting the associated coding device to a reset state in the event of equality. Because the predetermined code word repeats statistically in the encoded data, a fault adversely affects the decoding for not more than one time interval.

REFERENCES:
patent: 4663500 (1987-05-01), Okamoto et al.
patent: 4856063 (1989-08-01), McCalmont
patent: 4972481 (1990-11-01), Santesson
patent: 5060266 (1991-10-01), Dent
H. Muller, "Bit Sequence Independence Through Scramblers in Digital Communication Systems", Dec., 1974, pp. 475-479, NTZ Nachrichtechnische Zeitschrift.

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