Communications: electrical – Continuously variable indicating – With meter reading
Patent
1985-11-18
1989-01-17
Griffin, Robert L.
Communications: electrical
Continuously variable indicating
With meter reading
3408253, 380 23, 380 24, 235379, G07D 700, H04K 100, H04L 900
Patent
active
047990619
ABSTRACT:
A system for authenticating components in a communications system using cryptographic techniques to determine if each has the proper key without disclosing information which would be useful to an imposter in deriving the key. A random number generated at a first terminal is encrypted under its key for transmission as a first value to a second terminal whose identity is to be authenticated. The second terminal decrypts the transmitted first value using its key deriving a second value (which equals the random number if the keys are identical.) The second terminal then encrypts its key using the second value as the key, generating a third value which is transmitted back to the first terminal for verification. The first terminal then verifies the third value, either by decrypting it using the random number as the key to obtain its key or by encrypting its key using the random number as key to derive the third number (if the two keys are identical.) Optionally, roles of the two terminals are then reversed after the second terminal has been identified, allowing the second terminal to authenticate the first terminal.
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Cryptography: A Primer; Alan G. Konheim; 1981; pp. 331-347.
Abraham Dennis G.
Double Glen P.
Neckyfarow Steven W.
Bigel Mitchell S.
Griffin Robert L.
International Business Machines - Corporation
Seaman Kenneth A.
Smith Ralph E.
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