Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-11-03
1998-01-06
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 23, 380 25, 380 49, H04L 932, H04L 900
Patent
active
057063478
ABSTRACT:
A method and system for verifying the identity of a computer network node is provided. As part of the session initiation process between two partner nodes planning to exchange sensitive encrypted data, the node receiving data generates and encrypts a session key which is transmitted to the node sending data. At the sending node, the low order four bytes of the encrypted session key are saved for authentication of the receiving node. The encrypted session key is returned to the receiving node as session set-up continues. The receiving node concatenates the low order four bytes of the encrypted session key with four bytes of pseudorandom data to form an initial chaining value which is then encrypted and transmitted to the sending node. The sending node recovers the initial chaining value and compares the low order four bytes of this value with the low order four bytes of the encrypted session key previously saved. If the values are the same, authentication of the receiving node is established.
REFERENCES:
patent: 4193131 (1980-03-01), Lennon et al.
patent: 4227253 (1980-10-01), Ehrsam et al.
patent: 4500750 (1985-02-01), Elander et al.
patent: 4649233 (1987-03-01), Bass et al.
Burke Andrew Stephen
Gugliotta Dale Carl
Gregory Bernarr E.
International Business Machines - Corporation
Timar John J.
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