| 摘要 |
PCT No. PCT/FR97/00826 Sec. 371 Date Oct. 29, 1998 Sec. 102(e) Date Oct. 29, 1998 PCT Filed May 7, 1997 PCT Pub. No. WO97/42610 PCT Pub. Date Nov. 13, 1997A method for performing electronic transactions between a card, a service provider having at least one terminal configured to accept the card and a centralized system configured to be connected to the terminal. The terminal transmits to the card a parameter M including the sum of the transaction and its identity. The card produces two signatures, a first signature (z) depending on a secret debit key (k) and on the parameter (M), this first signature being a proof that the card balance has been debited; and a second signature (y) depending on the first signature (z), the second signature being produced either by an RSA algorithm or by an interactive algorithm. The terminal checks the second signature (y) but not the first one because it is unable to recover the secret debit key (k). The terminal stores the different first signatures (proofs) (z) and the parameters (M) for the different transactions. The centralized system can collect the first signatures and the parameters. The centralized system can recover the secret debit key (k) based on the card identities and can credit the service provider.
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