Method of checking authenticity of a data carrier

• US 6,343,743 B1
• Filed: 06/17/1998
• Issued: 02/05/2002
• Est. Priority Date: 10/23/1995
• Status: Expired due to Fees

• Current Assignee: Giesecke & Devrient GmbH
• Original Assignee: Giesecke & Devrient GmbH
• Inventors: Lamla, Michael
• Primary Examiner(s): Lee, Michael G.
• Assistant Examiner(s): LE, UYEN CHAU N
• Application Number:
  US09/043,108
• Time in Patent Office: 1,329 Days
• Field of Search: 235/454, 235/492, 235/468, 235/470, 235/487, 235/491, 235/494, 235/380, 235/451, 369/15, 360/2
• US Class Current: 235/492
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G07F 7/082 Features insuring the integrity of the data on or in the card
• CPC Class Codes: G07F 7/086 by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer for security documents G07D7/00; for the reading of record-carriers in general G06K7/00; for the design of coded credit-cards G06K19/10
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

The invention relates to a method for testing the authenticity of a data carrier with an integrated circuit and is characterized in that a material is provided in an area of the integrated circuit which is excited to luminesce for example by an electromagnetic radiation or by an electric field, the electromagnetic radiation emitted by the material being measured and evaluated for determining the authenticity of the data carrier.

Claims

1. A method for testing the authenticity of a data carrier with at least one electronic module (2) including at least an integrated circuit with memory and logic elements and elements for communication with an external device which evaluates a physical property determined by the integrated circuit and characteristic of the circuit, characterized by the following steps:

applying a luminescent material (6) directly to at least one area (13) of the integrated circuit (5),

exciting the luminescent material (6) to luminesce,

detecting the electromagnetic radiation emitted during luminescence, and

deriving an authenticity statement about the data carrier (1) on the basis of the detected electromagnetic radiation.

2. The method of claim 1, characterized in that the material is excited by an electromagnetic radiation produced outside the data carrier and supplied to the material or by an electric field produced by the integrated circuit.

3. The method of claim 1, characterized in that the luminescence of the material is evaluated for determining authenticity.

4. The method of claim 3, characterized in that the emission spectrum is evaluated for determining the authenticity of the data carrier.

5. The method of claim 4, characterized in that the relation of emission spectrum and excitation spectrum is evaluated for determining the authenticity of the data carrier.

6. The method of claim 4, characterized in that the emission spectrum is evaluated at a wavelength of about 600 nm.

7. The method of claim 4, characterized in that the difference of the emission spectra obtained with different excitation is evaluated for determining authenticity.

8. The method of claim 1, characterized in that the electromagnetic radiation emitted by the material is converted into a binary characteristic value which is stored in the memory of the integrated circuit.

9. The method of claim 8, characterized in that the binary characteristic value is derived from the spectral distribution of the emitted electromagnetic radiation and/or the spatial arrangement of the light-emitting zones.

10. The method of claim 9, characterized in that the binary characteristic value derived from the detected electromagnetic radiation is compared with the characteristic value read from the memory of the integrated circuit.

11. A system for testing the authenticity of a data carrier, comprising

a data carrier (1) having at least one electronic module (2) including at least an integrated circuit (5) with memory elements (9), logic elements (10) and communication elements (4),

means (24) for authenticity testing which access at least partial areas of the memory means (9) via the communication elements (4) for reading and/or writing,

means (22) for measuring a physical property of the integrated circuit (5), characterized in that the integrated circuit (5) has at least one area (13) with a material (6) excitable to luminesce, the area (13) being disposed such that electromagnetic radiation emitted by the material (6) can reach the measuring means (22),

means (11,21) for exciting the material (6) to luminesce, and

means (22) for detecting the electromagnetic radiation emitted by the material (6) after excitation of luminescence, and for determining a characteristic property thereof.

12. The system of claim 11, characterized in that the means (21, 22 and 24) are components of a device (20).

13. The system of claim 12, characterized in that the excitation means (21) is a laser and the means (22) is a photodetector having a row or a matrix of photodiodes.

14. The system of claim 11, characterized in that the means (11) for exciting the material (6) is a component of the integrated circuit (5).

15. A data carrier (1) for use in a system for testing the authenticity thereof and having an electronic module (2) including at least one integrated circuit (5) with memory elements (9) and logic elements (10) and elements (4) for communication with an external device (20), characterized in that

the integrated circuit (5) is provided with at least one area (13) formed of a material (6) excitable to luminesce, said area being disposed such that electromagnetic radiation emitted by the material (6) upon luminescence is detectable by a measuring means (22),

wherein the area (13) includes light-emitting zones (12) and non-light-emitting zones (14) whose arrangement is characteristic of the data carrier.

16. The data carrier of claim 15, characterized in that a window (3) is provided within the module (2) in the area (13) with the material (6).

17. The data carrier of claim 16, characterized in that the material (6) and the integrated circuit (5) are surrounded by a transparent casting compound (8) which also fills the window (3).

18. The data carrier of claim 15, characterized in that the arrangement of the zones (12) and (14) within the area (13) is a class feature or an individual feature for the integrated circuit (5) of the data carrier.

19. The data carrier of claim 15, characterized in that the material (6) has luminescent properties.

20. The data carrier of claim 19, characterized in that the material (6) is a light-emitting semiconductor or a light-emitting polymer.

21. The data carrier of claim 20, characterized in that the light-emitting