04193131 is referenced by 124 patents and cites 6 patents.

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.

Title
Cryptographic verification of operational keys used in communication networks
Application Number
5/857546
Publication Number
4193131
Application Date
December 5, 1977
Publication Date
March 11, 1980
Inventor
Walter L Tuchman
Woodstock
NY, US
Paul N Prentice
Hyde Park
NY, US
Jonathan Oseas
Hurley
NY, US
Carl H W Meyer
Kingston
NY, US
Stephen M Matyas
Poughkeepsie
NY, US
Richard E Lennon
Woodstock
NY, US
Agent
Edwin Lester
Assignee
International Business Machines Corporation
NY, US
IPC
H04L 9/00
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