Electronic cash implementing method using a trustee

Details Electronic cash implementing method using a trustee Electronic cash implementing method using a trustee

1996-11-04

1999-05-04

Cain, David

Cryptography

Particular algorithmic function encoding

Public key

380 23, H04K 100

Patent

active

059012293

ABSTRACT:
In an electronic cash implementing method using a trustee, a user registers his identification information ID.sub.U and anonymous public key N with the trustee and receives a license (B,I). The user processes the license (B,I) by a public key corresponding to the amount to be issued and sends the processed information to a bank to have it attach a blind signature to the information so that the user obtain electronic cash C from the blind signature. The user transmits to a shop the information B,I,C,N and a digital signature that assures the divisional use of the electronic cash. The shop verifies the validity of the information B and C and accepts it as cash and sends a history H of communication with the user to the bank and receives a payment therefrom. The bank places all received communication histories under its supervision and makes a check to see if the amount x spent by the electronic cash C is in excess of its face value X, and if so, informs the trustee of the information N contained in the communication history. The trustee uses the information ID.sub.U thus received to specify the corresponding user identification information ID.sub.U.

REFERENCES:
patent: 4759063 (1988-07-01), Chaum
patent: 5521980 (1996-05-01), Brands
patent: 5604805 (1997-02-01), Brands

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