Unlocking system for use with cards
First Claim
1. An unlocking system for use with cards each having recorded thereon a secret number, a plurality of subnumbers and a specifying code for selecting at least one of the subnumbers, comprising:
- a card reader for reading the data recorded on the card,a memory for storing at least a secret number,electric unlocking means,first control means for comparing the secret number on the card with the secret number in the memory to give an unlocking instruction to the electric unlocking means when a match is found between the two secret numbers, andsecond control means for checking whether or not the secret number on the card and the secret number in the memory are in a predetermined relation established with use of the subnumber selected by the specifying code from among the plurality of subnumbers to give an unlocking instruction to the electric unlocking means and to store the secret number of the card in the memory for the renewal of the secret number in the memory, when the secret number on the card and the secret number in the memory are in the predetermined relation.
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Accused Products
Abstract
An unlocking system is used with cards each having recorded thereon a secret number, a plurality of subnumbers, a specifying code for selecting at least one of the subnumbers, and an effective period. The system comprises a card reader for reading the data recorded on the card, a memory for storing a secret number, specifying code and effective period, and a processing unit for unlocking. The processing unit reduces the effective period stored in the memory by 1 in terms of unit time, e.g. 1 day, upon lapse of every unit time, e.g. 1 day or 24 hours. The unit further compares the secret number on the card with the secret number in the memory and gives an unlocking instruction when a match is found between the two secret numbers, with the effective period in the memory exceeding a predetermined period, e.g. 0. When the secret number on the card is not identical with the secret number in the memory, the processing unit checks whether or not the two secret numbers are in a predetermined relation established with use of the subnumber selected by the specifying code in the memory from among the plurality of subnumbers on the card, and gives an unlocking instruction and stores in the memory for renewal the secret number, the effective period and the specifying code on the card.
41 Citations
12 Claims
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1. An unlocking system for use with cards each having recorded thereon a secret number, a plurality of subnumbers and a specifying code for selecting at least one of the subnumbers, comprising:
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a card reader for reading the data recorded on the card, a memory for storing at least a secret number, electric unlocking means, first control means for comparing the secret number on the card with the secret number in the memory to give an unlocking instruction to the electric unlocking means when a match is found between the two secret numbers, and second control means for checking whether or not the secret number on the card and the secret number in the memory are in a predetermined relation established with use of the subnumber selected by the specifying code from among the plurality of subnumbers to give an unlocking instruction to the electric unlocking means and to store the secret number of the card in the memory for the renewal of the secret number in the memory, when the secret number on the card and the secret number in the memory are in the predetermined relation. - View Dependent Claims (2, 3)
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4. An unlocking system for use with cards each having recorded thereon a secret number, a plurality of subnumbers, a specifying code for selecting at least one of subnumber, and an effective period, comprising:
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a card reader for reading the data recorded on the card, a memory for storing at least a secret number and an effective period, first control means for reducing the effective period stored in the memory by 1 in terms of unit time upon lapse of every unit time, second control means for producing an unlocking signal when the secret number on the card is identical with the secret number of the memory, with the effective period in the memory exceeding a predetermined period, and third control means for producing an unlocking instruction and storing the secret number and the effective period on the card in the memory when the secret number on the card and the secret number in the memory are in a predetermined relation established with use of the subnumber selected by the specifying code from among the plurality of subnumbers. - View Dependent Claims (5, 6, 7, 8)
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9. A card issuing device comprising:
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a numerical value generator for generating a plurality of subnumbers and a specifying code for selecting at least one of the plurality of subnumbers, a memory for storing a previous secret number and a previous specifying code, a processing unit for preparing a current secret number in a predetermined relation with the previous secret number with use of the previous secret number in the memory and the subnumber selected by the previous specifying code in the memory from among a plurality of current subnumbers obtained from the numerical value generator, a memory control unit for storing in the memory the current secret number and a current specifying code obtained from the numerical value generator, and means for recording on a card the current secret number prepared, and the plurality of current subnumbers and the current specifying code obtained from the numerical value generator. - View Dependent Claims (10, 11, 12)
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Specification