Electronic cash system

Details Electronic cash system Electronic cash system

1992-06-08

1993-06-29

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 30, 380 49, 235379, H04K 100

Patent

active

052241629

ABSTRACT:
In an electronic cash system, K sets of blind signature information are derived from secret information containing identification information of a user, K/2 sets of them are opened and a bank attaches a blind signature to the remaining K/2 sets of information. The user obtains a signed license from the blind signature. The user generates blind signature information from the license and a desired amount of money and gets a blind signature of the bank to the blind signature information and obtains electronic cash signed by the bank from the blind signature. The user presents to a shop a residue power root of a node in a money hierarchial structure and the electronic cash, corresponding to the amount of money to be used, and the shop verifies their validity and, if they are valid, offers inquiry information to the user. The user offers, as response information, a residue power root of the node corresponding to the amount of money to be used to the shop. The shop verifies the validity of the response information and, if it is valid, acknowledges the payment with electronic cash of the amount of money to be used.

REFERENCES:
patent: 4630201 (1986-12-01), White
patent: 4633036 (1986-12-01), Hellman et al.
patent: 4949380 (1990-08-01), Chaum
patent: 4969189 (1990-11-01), Ohta et al.
patent: 4977595 (1990-12-01), Ohta et al.
patent: 5010485 (1991-04-01), Bigari
patent: 5140634 (1992-08-01), Guillou et al.

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