Portable pin card

Details Portable pin card Portable pin card

1991-09-19

1993-11-23

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

H04K 100

Patent

active

052651622

ABSTRACT:
A portable Personal Identification Card allows a cardholder to enter a PIN code into his card at a location remote from an authorization terminal. In an alternate embodiment, a PIN code may be entered at the authorization terminal. The authorization terminal reads the cardholder's account number from the PIN card. The account number is transmitted to a central computer which uses this number to index into memory to find a personal identification number and encryption parameters. The central computer transmits a pseudo-random number to the PIN Card. Both the PIN Card and the central computer perform an encryption of a function of the corresponding personal identification number and pseudo-random number to derive a CGIPIN (Computer Generated Image of the PIN). If the CGIPIN transmitted from the PIN card matches the CGIPIN of the central computer, access is authorized.

REFERENCES:
patent: 5130519 (1992-07-01), Bush et al.

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