Revalidatable service supplying system
First Claim
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1. A revalidatable service supplying system based a plurality of sets of expenditure data items with each expenditure data item being capable of being cancelled solely if a validation data item corresponding to its set has already been cancelled, the system comprising:
- a plurality of data mediums, each medium including a plurality of cancellable memory points each having a physical address; and
a plurality of service-supplying machines each including read means for reading the states of said memory points and write means for cancelling memory points;
each medium including a fixed data item which is specific to that medium and which is readable by each machine; and
each machine including means for defining, as a function of said fixed data item, a configuration of physical addresses of memory points on the medium corresponding respectively to validation data items and to expenditure data items, together with the relationships between each validation data item and the corresponding set of expenditure data items.
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Abstract
The system comprises memory cards and card readers. The card memories (MEM) include validation memory points Vj and credit memory points Ci,j. The addresses of the validation points Vj and the addresses of the associated credit point Ci,j are defined by a reference table (TRR) and a permutation table (TP) which make use of a data item (ZF) which is specific to the card.
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6 Claims
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1. A revalidatable service supplying system based a plurality of sets of expenditure data items with each expenditure data item being capable of being cancelled solely if a validation data item corresponding to its set has already been cancelled, the system comprising:
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a plurality of data mediums, each medium including a plurality of cancellable memory points each having a physical address; and a plurality of service-supplying machines each including read means for reading the states of said memory points and write means for cancelling memory points;
each medium including a fixed data item which is specific to that medium and which is readable by each machine; and
each machine including means for defining, as a function of said fixed data item, a configuration of physical addresses of memory points on the medium corresponding respectively to validation data items and to expenditure data items, together with the relationships between each validation data item and the corresponding set of expenditure data items. - View Dependent Claims (2, 3, 4, 5)
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6. A revalidatable system for supplying a plurality of services, wherein for each service there exists a plurality of sets of expenditure data items, with each expenditure data item being capable of being cancelled in order to obtain the corresponding service only if a validation data item corresponding to said set of expenditure data items has already been cancelled, the system comprising:
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a plurality of data mediums for giving access to at least two of said services and comprising a plurality of memory points which are capable of being cancelled and each of which has a physical address; and a plurality of machines each of which is capable of supplying at least one of said services, each machine including read means for reading the state of said memory points and write means for cancelling memory points; each data medium including a fixed data item which is specific to the medium and which is readable by the machine; and each machine including means for defining, as a function of said fixed data item, a configuration of physical addresses selected from the memory points in the medium corresponding to a particular service, and attributing some of the memory points therein to validation data items and the others to expenditure data items for said service, the machine also including means for defining the relationships between each validation data item and a corresponding set of expenditure data items, with the physical addresses of memory points on a medium for any one service being different from the physical addresses of memory points on the same medium for the other service(s).
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Specification