Communications network using IC cards

Details Communications network using IC cards Communications network using IC cards

1986-03-04

1989-08-29

Buczinski, Stephen C.

Cryptography

Electric signal modification

Having production of printed copy

380 25, 380 28, 235380, H04K 300

Patent

active

048625019

ABSTRACT:
A communications network has a plurality of customer terminals and a single center terminal which are coupled through communication lines. A large scale integrated circuit is operatively coupled to each terminal. The integrated circuit device has enciphering and deciphering functions and has a recording device. When a transaction request message is sent from one customer terminal to the center, the transaction request message is enciphered by the integrated circuit device, and the enciphered message is sent to the center. In order to increase the transaction verification capability, the transmission message is recorded, in association with encryption of the transmission message, in an area of the recording device which can be accessed from outside only for readout. In order to further improve the transaction verification capability, the response message is enciphered by the integrated circuit device in the center. The enciphered response message is deciphered by the integrated circuit device in the customer terminal. The response message is recorded in the area of the recording device such that the encrypted message and decrypted message can be distinguished from each other.

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IEEE Spectrum, vol. 21, No. 2, Feb. 1984, pp. 43-49, IEEE New York, U.S.; S. B. Weinstein: "Smart Credit Cards: The Answer to Cashless Shopping", p. 47, right-hand column, lines 20-58*.

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