Method of checking authenticity of sheet with built-in electronic circuit chip
First Claim
1. A forgery checking method of checking a sheet as to forgery thereof, said sheet being provided with an electronic circuit chip from which information can be read out and to which information can be written, said sheet having visible information thereon, and visible information of said sheet and relative position information of a sheet constituent element relative to said electronic circuit chip being stored in said electronic circuit chip, the method comprising the steps of:
- determining relative position information of a sheet constituent element relative to said electronic circuit chip, and comparing the determined relative position information with said relative position information stored in said electronic circuit chip;
determining visible information of the sheet and comparing the determined visible information with said visible information stored in said electronic circuit chip; and
determining discriminatively authenticity of the sheet on the basis of at least one of the comparison results in said visible information determining step and said relative position information determining step.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of checking sheets as to forgery thereof, the sheet being provided with an electronic circuit chip from which information can be read out or written and having visible information. The method includes a step of encrypting the visible information of the sheet and storing the encrypted visible information in the electronic circuit chip, and a step of determining discriminatively the authenticity of the sheet by comparing the visible information of the sheet with the information stored in the electronic circuit chip.
30 Citations
15 Claims
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1. A forgery checking method of checking a sheet as to forgery thereof, said sheet being provided with an electronic circuit chip from which information can be read out and to which information can be written, said sheet having visible information thereon, and visible information of said sheet and relative position information of a sheet constituent element relative to said electronic circuit chip being stored in said electronic circuit chip, the method comprising the steps of:
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determining relative position information of a sheet constituent element relative to said electronic circuit chip, and comparing the determined relative position information with said relative position information stored in said electronic circuit chip;
determining visible information of the sheet and comparing the determined visible information with said visible information stored in said electronic circuit chip; and
determining discriminatively authenticity of the sheet on the basis of at least one of the comparison results in said visible information determining step and said relative position information determining step. - View Dependent Claims (2, 3, 4, 5, 6, 7)
wherein said stored visible information and said stored relative position information result from encryption of physical or chemical information of sheet constituent elements which can discriminatively be identified externally of said sheet. -
3. A forgery checking method set forth in claim 1,
wherein at least one of said stored visible information of the sheet and said stored relative position information of a sheet constituent element relative to said electronic circuit chip is encrypted. -
4. A forgery checking method set forth in claim 3,
further comprising the step of storing digital signature information in said electronic chip. -
5. A forgery checking method set forth in claim 1,
further comprising the steps of: -
determining previously a threshold value on the basis of elementary information stored in at least two electronic circuit chips incorporated in a single sheet, deciding that said sheet is forged when a difference is found in a greater number of said elementary information than said threshold value, and deciding that said sheet is authentic when a difference is found in a number of said elementary information which is equal to or smaller than said threshold value.
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6. A forgery checking method set forth in claim 1,
further comprising: -
scanning said sheet in which said electronic circuit chip is mounted at a random position, and encrypting the information obtained by said scanning or generating a digital signature and affixing said digital signature to said information or affixing said digital signature to the encrypted information for storage in said electronic circuit chip.
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7. A forgery checking method set forth in claim 1,
wherein said method comprises storing information, which is uniquely associated with said electronic circuit chip, in said electronic circuit chip, and storing said information to be stored in said electronic circuit chip in another storing means differing from said electronic circuit chip while establishing correspondence with the information uniquely associated with said electronic circuit chip.
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8. A sheet management system comprising:
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means for receiving a signal from a sheet having an electronic circuit chip incorporated therein, said electronic circuit chip including means for transmitting intermittently signals generated to be unique to the sheet, with random transmission interruption periods and means for stopping the transmission in response to a stop command, means for emitting a radio wave within a limited coverage while being moved along a direction in which said sheet is stacked, and means for performing identification of the sheet upon reception of a signal from said sheet to thereby send a stop command valid only for said sheet, while waiting for a predetermined time unless the signal is received.
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9. A forgery checking method of checking a sheet as to forgery thereof, said sheet being provided with an electronic circuit chip from which information can be read out and to which information can be written, said sheet having tangible information thereon, and tangible information of said sheet and relative position information of a sheet constituent element relative to said electronic circuit chip being stored in said electronic circuit chip, the method comprising the steps of:
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determining relative position information of a sheet constituent element relative to said electronic circuit chip, and comparing the determined relative position information with said relative position information stored in said electronic circuit chip;
determining tangible information of the sheet and comparing the determined tangible information with said tangible information stored in said electronic circuit chip; and
determining discriminatively authenticity of the sheet on the basis of at least one of the comparison results in said tangible information determining step and said relative position information determining step. - View Dependent Claims (10, 11, 12, 13, 14, 15)
wherein said stored tangible information and said stored relative position information result from encryption of physical or chemical information of sheet constituent elements which can discriminatively be identified externally of said sheet. -
11. A forgery checking method set forth in claim 9,
wherein at least one of said stored tangible information of the sheet and said stored relative position information of a sheet constituent element relative to said electronic circuit chip is encrypted. -
12. A forgery checking method set forth in claim 11,
further comprising the step of storing digital signature information in said electronic chip. -
13. A forgery checking method set forth in claim 9,
further comprising the steps of: -
determining previously a threshold value on the basis of elementary information stored in at least two electronic circuit chips incorporated in a single sheet, deciding that said sheet is forged when a difference is found in a greater number of said elementary information than said threshold value, and deciding that said sheet is authentic when a difference is found in a number of said elementary information which is equal to or smaller than said threshold value.
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14. A forgery checking method set forth in claim 9,
further comprising: -
scanning said sheet in which said electronic circuit chip is mounted at a random position, and encrypting the information obtained by said scanning or generating a digital signature and affixing said digital signature to said information or affixing said digital signature to the encrypted information for storage in said electronic circuit chip.
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15. A forgery checking method set forth in claim 9,
wherein said method comprises storing information, which is uniquely associated with said electronic circuit chip, in said electronic circuit chip, and storing said information to be stored in said electronic circuit chip in another storing means differing from said electronic circuit chip while establishing correspondence with the information uniquely associated with said electronic circuit chip.
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Specification