Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1989-12-12
1990-10-02
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 2, 380 44, 380 50, 34082507, 36424295, H04K 106, H04T 300, H04L 514, H04B 900
Patent
active
049612212
ABSTRACT:
An information encryption method particularly intended for a communication system in which bidirectional multiplexed communications of the point-to-multipoint type are derived between a switching exchange and plural terminal stations. The switching exchange transmits first multiplexed words respectively destined for the terminal stations. The terminal stations supply second words which are multiplexed and transmitted towards the switching exchange. In the switching exchange, informations concerning transmission errors detected in the second words are derived and transmitted towards the terminal stations, and the first words are encrypted as a function of second words previously received free of transmission error in the switching exchange. In each of the terminal stations, the informations concerning the transmission errors are detected, and the second words transmitted from the terminal station and received free of transmission error by the switching exchange are memorized. The first words received are decrypted in the terminal station as a function of transmission errors and the memorized second words.
REFERENCES:
patent: 4805216 (1989-02-01), Gruenberg
patent: 4809327 (1989-02-01), Shima
Cain David
L'Etat Francais represente par le Ministre des Poste, Telecommun
Tarcza Thomas H.
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