METHOD AND SYSTEM FOR PAYMENT BY ELECTRONIC CHEQUE

摘要

The invention concerns a method of payment by electronic cheque between a transmitter equipped with a medium comprising at least an electronic blank cheque certified by an institution and an amount and a recipient provided with a device adapted for receiving the cheque. So that the device may recognise the authenticity of the medium and the cheque, the method comprises a computation by the medium of a table (5) from k values (S[1],...S[k]) giving n times k intermediate values, computation by the medium of a key (SK) from the last k intermediate values of order n and, from said key (SK), computing a sign (IMCF) of the cheque, an engagement of the medium with respect to the device, a random/pseudo-random computation, by the device, of k numbers m. ranging between zero and n, of successive applications of one-way functions (OWF) to k values (S[1],...S[k]), a response from the medium including a set of k intermediate values obtained for the one-way function (OWF) successive applications to each of the k values (S[1],...S[k]) m number of times ranging between zero and n; by the device a computation based on each of the intermediate k values of order m until the last intermediate k values of order m until the last intermediate k values of order n are obtained, a computation of said key (SK) from these intermediate values of order n and, therefrom, a computation of the sign (IMCF), and comparison and verification before acceptation by the cheque device.