Offline PIN validation with DES

Details Offline PIN validation with DES Offline PIN validation with DES

1985-02-12

1987-04-28

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 28, H04L 900

Patent

active

046616586

ABSTRACT:
A method of offline personal authentication in a multi-terminal system uses a secret user PIN, a secret key and other nonsecret data stored on a customer memory card and a nonsecret validation value stored in each terminal connected in a network. The technique of "tree authentication" is used which employs an authentication tree with an authentication tree function comprising a one-way function. An authentication parameter is calculated as a function of a personal key and a user identifier read from the user's card and the PIN entered by the user. The calculated authentication parameter is mapped to a verification value using the one-way function to the root of the authentication tree. The verification value obtained by mapping the calculated authentication parameter is then compared with a global verification value stored at the terminal. If the comparison is favorable, the system is enabled for the user; otherwise, the user is rejected.

REFERENCES:
patent: 4218738 (1980-08-01), Matyas et al.
patent: 4309569 (1982-01-01), Merkle
patent: 4438824 (1984-03-01), Mueller-Schloer
"PIN Manual", by Interbank Card Association, 1980.

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