Method for effecting an electronic payment transaction having a variable number of payment units, as well as payment means and system for applying the method
First Claim
1. Method for effecting a payment transaction with an electronic payment means and a payment station, comprising the issuing by the payment means to the payment station of at least a first payment value, payment values being representative for one or more payment units to be settled, each subsequent payment value being related to the first payment value by a one-way function in such a manner that the first payment value may be obtained from a further payment value by repeatedly applying the function.
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Accused Products
Abstract
The invention relates to a method for protected payment with electronic payment device, such as "intelligent" payment cards ("smart cards"), in a variable number of steps. In this connection, use is made of a non-reversible function, of which successive function values are provided by the payment device to the payment station in question by way of proof of payment. On the basis of these function values, there may take place both a verification and a determination of the number of steps. Such method finds application, e.g., in public telephones and in copiers. The invention further relates to a payment device and a payment system for applying the method.
51 Citations
13 Claims
- 1. Method for effecting a payment transaction with an electronic payment means and a payment station, comprising the issuing by the payment means to the payment station of at least a first payment value, payment values being representative for one or more payment units to be settled, each subsequent payment value being related to the first payment value by a one-way function in such a manner that the first payment value may be obtained from a further payment value by repeatedly applying the function.
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12. Payment means provided with an integrated circuit, the integrated circuit comprising a micro-processor and a memory, the micro-processor being programmed for effecting a payment transaction in which the payment means interacts with a payment station, a transaction comprising the issuing by the payment means to the payment station of at least a first payment value, payment values being representative for one or more payment units to be settled, each subsequent payment value being related to the first payment value by a one-way function in such a manner that the first payment value may be obtained from a further payment value by repeatedly applying the function.
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13. System for electronic payments, comprising an electronic payment means, a payment station and a settlement station, the system being designed for effecting a payment transaction comprising the issuing by the payment means to the payment station of at least a first payment value, payment values being representative for one or more payment units to be settled, each subsequent payment value being related to the first payment value by a one-way function in such a manner that the first payment value may be obtained from a further payment value by repeatedly applying the function.
Specification