Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1987-05-01
1989-01-10
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
34082534, H04L 900, G07D 700
Patent
active
047979208
ABSTRACT:
An electronic funds transfer system employs a means to verify a personal identification number PE entered by the user with the correct PIN (PT) stored at the host terminal. The remote and host terminals each generate an encryption key, and encrypt PE and PT at the respective terminals. These values are transmitted to the other terminal, where they are re-encrypted using the other encryption key. The double-encrypted numbers are then compared. The user-entered PIN can thus be verified without the need to share en encryption key between the remote and host terminals. The encryption transformation is of the type where the results of successive encryptions does not depend on the order of encryption.
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Buczinski Stephen C.
MasterCard International Inc.
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