Validation check for remote digital station

Details Validation check for remote digital station Validation check for remote digital station

1985-10-30

1987-05-12

Yusko, Donald J.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235382, 34082534, H04Q 900, H04L 900

Patent

active

046653961

ABSTRACT:
A cryptographic validation for an external station of a communication system provided with a central data processing device, a number of access stations which are coupled thereto and a number of external stations which can be selectively coupled to the access stations. To validate an external station, the access station transmits a message encoded by a first encoding key. The external station decodes the message received and re-encodes the message using a second encoding key, transmitting the re-encoded message back to the access station. The access station then decodes this message using a second key decoder. This decoded data is compared with the data originally encoded by the access station. If the data is identical, the external station is validated.

REFERENCES:
patent: 4218582 (1980-08-01), Hellman
patent: 4298793 (1981-11-01), Melis
patent: 4310720 (1982-01-01), Check, Jr.
patent: 4317957 (1982-03-01), Sendrow
patent: 4349695 (1982-09-01), Morgan et al.
patent: 4423287 (1983-12-01), Zeidler
patent: 4454414 (1984-06-01), Benton

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