Cryptography – Key management – Having particular key generator
Patent
1994-06-30
1996-06-11
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 20, 380 23, 380 25, 380 48, H04L 900
Patent
active
055264352
ABSTRACT:
The invention prevents unauthorized use of data in communications. When terminals with different data transmission rates are simultaneously connected to a host computer, the host computer sets a single common data communication rate to all the terminals to assure synchronization. The host computer is connected each terminal via communications network. The host computer sends a data body to each terminal over a unidirectional communications link in a cyclic manner while a bidirectional communications link is established between the host computer and each terminal. Response to an individual request from each terminal, the host computer downloads descrambling data for descrambling and a loader program for executing the data body. The host computer determines from among the terminals, any terminal having a communications means that sets the lowest data transmission rate, and sets the data transmission rates of the terminals simultaneously connected thereto to the lowest rate.
REFERENCES:
patent: 3789131 (1974-01-01), Harney
patent: 4245245 (1981-01-01), Matsumoto et al.
patent: 5159633 (1992-10-01), Nakamura
Gregory Bernarr E.
Ricos Co., Ltd.
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