초록 ▼

An off-line electronic cash system having an electronic coin, a bank B, a payee S, and a user U with an account at the bank B as well as a user password z.sub.u,i, has a method for performing an electronic cash transfer. An electronic coin is withdrawn from the bank B by the user U and an electronic

An off-line electronic cash system having an electronic coin, a bank B, a payee S, and a user U with an account at the bank B as well as a user password z.sub.u,i, has a method for performing an electronic cash transfer. An electronic coin is withdrawn from the bank B by the user U and an electronic record of the electronic coin is stored by the bank B. The coin is paid to the payee S by the user U. The payee S deposits the coin with the bank B. A determination is made that the coin is spent and the record of the coin is deleted by the bank B. A further deposit of the same coin after the record is deleted is determined. Additionally, a determination is made which user U originally withdrew the coin after deleting the record. To perform these operations a key pair is generated by the user, including public and secret signature keys. The public signature key along with a user password z.sub.u,i and a withdrawal amount are sent to the bank B by the user U. In response, the bank B sends a coin to the user U signed by the secret key of the bankindicating the value of the coin and the public key of the user U. The payee S transmits a challenge counter to the user U prior to receiving the coin.

대표청구항 ▼

[ What is claimed is:] [1.] In an off-line electronic cash system having an electronic coin, a bank B, a user U having an account at said bank B and a payee S, a method for performing an electronic cash transfer independently of public key cryptography, comprising the steps of:(a) withdrawing said e

[ What is claimed is:] [1.] In an off-line electronic cash system having an electronic coin, a bank B, a user U having an account at said bank B and a payee S, a method for performing an electronic cash transfer independently of public key cryptography, comprising the steps of:(a) withdrawing said electronic coin from said bank B by said user U;(b) storing an electronic record of said electronic coin by said bank B;(c) paying said electronic coin to said payee S by said user U;(d) depositing said electronic coin with said bank B by said payee S;(e) determining that said electronic coin is spent in accordance with the depositing of step (d);(f) deleting said record by said bank B in response to the determining of step (e);(g) determining a further deposit of said electronic coin after said deleting of said record; and(h) determining said user U in accordance with said determining of said further deposit.