Cryptographic verification of operational keys used in communication networks
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United States of America Patent
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-
Mar 11, 1980
Grant Date -
N/A
app pub date -
Dec 5, 1977
filing date -
Dec 5, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a data communication network providing communication security for communication sessions between a first station and a second station where each station has cryptographic apparatus provided with an operational key which should be common to both stations for cryptographic operations, an operational key verification arrangement is provided in which a first number provided at the first station is operated upon in accordance with the first station operational key to obtain cryptographic data for transmission to the second station, requiring the second station to perform an operation on the first station cryptographic data in accordance with the second station operational key to obtain cryptographic data for transmission back to the first station and performing an operation at the first station in accordance with the first number and the second station cryptographic data to verify that the second station is the source of second station cryptographic data only if the operational keys are identical.
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