DE19608757A1 - Method and device for checking the authenticity of documents in the form of chip cards - Google Patents

Abstract

The proposed method is used for checking the authenticity of documents in the form of chip cards or smart cards fulfilling one or more functions, e.g. as bank, cash and credit cards used for withdrawing money and debiting amounts, and/or as ID documents for persons, motor vehicles (registration document, tachograph), as ke ys, etc. An inexpensive but reliable authenticity check is achieved as follows: the document comprising a base material with embedded foreign bodies whose physical properties differ from those of the base material and are distributed randomly within it is scanned for foreign bodies by a detector when first issued, in at least one scanning track selected by a random generator. The detector output values are then recorded in a first register present in the chip and locked following initialisation; the stored contents of that register cannot be read, manipulated or compared to other values from outside. When the document thus prepared is used, its foreign body data are read by at least one detector in the terminal unit which receives the document, stored in a second register in the chip which is separate from the first register, compared internally with the foreign body pattern in the first register and evaluated so as to release the document if the output values and foreign body density match.

Description

The invention relates to a method for Authenticity control of documents in the form of chip cards or Smart cards that enable one or more functions, e.g. B. as bank, cash and credit cards for spending money, for Debit value units and / or serve as an ID document for People, motor vehicles (registration document, trip scream ber), keys or the like. Valuable documents have been protected against counterfeiting and abuse. This was done using special paper grades with watermark, by embedding metal strips and the Use of a print that is as forgery-proof as possible From this point of view, authentication of documents is important difficult. It requires one, especially in machines  considerable effort or a reduction in through the Authenticity test achievable counterfeit security.

The closest state of the art on the Ge offers the security of documents against copying and forgery results from the following references: CH-PS 569144 "Blatt shaped material for documents ", CH-PS 577722" device for Authenticity control of documents ", DE-PS 26 35 795" procedure and device for checking the authenticity of documents ", U.S. Patent 4,218,674 "Method and System for Verifying Authenticity Safe against Forgery ". The problem of authenticity mentioned at the beginning The control of documents is also known by this suggestions have not been fully satisfied, especially not when it comes to the use of Smart cards, d. H. Vending machine cards with a chip (elec tronic unit for controlling, reading and writing information mations) are equipped. For the traffic of Kun with ATMs, other types of machines or from users in networks such as B. Internet would therefore be a test method and a device intended for this purpose, a really reliable, tamper-proof authenticity testing enabled.

The inventive method, according to which a particular affordable, yet secure authenticity check light is essentially characterized in that that from a basic mass with embedded foreign bodies whose physical properties differ from those of the basic mass and have a random distribution in the basic mass, existing ones Document at first issuance in at least one of one Random generator selected scan track of at least one Detector for foreign objects is scanned that the output values of the detector into a provided in the chip of the chip card, first register locked after initialization the stored content is neither legible from the outside  is still comparable with other values, and that with users of the document prepared in this way, its foreign body information mations of at least one detector of the document reading terminals and in a parallel to the first Registers stored in the second register and existing in the chip internally compared with the foreign body pattern in the first register and in the sense of a release of the document if there is a match of the initial values are evaluated. The invention is based on this with the knowledge that now an authenticity check with the card reader is made possible with simple means without the security information (i.e. the authenticity detection the chip card guaranteeing data) ever the chip of the card te leaves.

In this technique, there is a substrate for Chipkar ten prerequisite that to increase the counterfeiting and Ko pier safety with optically and / or electronically recognizable Foreign bodies are accidentally displaced. By simple orken position and properties of the foreign body, as by comparing this information in a memory of the The chip card can be checked for authenticity.

The coordinates (X-Y [position], Z [physical egg properties]) of these foreign bodies at the exhibition the chip card with the help of a random generator (the whole area or a selected part of the area X-Y) and in Card chip saved as non-readable information. At the Everyone reads the chip card in a chip card terminal Foreign objects read according to coordinates and with those in the coordinate Tent memory of the chip card values compared. Stim men the data stored in the card chip with the data for the Ko ordinates (X-Y-Z) of the data determined from the foreign body, the chip card is recognized as valid and the chip for Transactions released. Voices that are saved in the card chip saved data about the coordinates (X-Y-Z) of the foreign bodies  does not match, the chip card is recognized as invalid and ab assigned or withheld.

The foreign bodies can be un depending on their different physical properties with differences detection methods can be located and read. To the methods include lasers, infrared detection (e.g. energy ab radiation), magnetic properties (please refer to the patent specifications cited at the beginning of the prior art pointed), ultrasound (e.g. echo detection) etc. The various which detection methods can also be used simultaneously and thus make copying or counterfeiting practical unthinkable because every foreign body has several properties and these properties in the position (coordinate) on the Chip card are stored in the chip.

Otherwise, it is also possible to advance the chip card to make with a stepper motor, which by a Taktfre Sequence divider in the chip's chip card is controlled to quickly and safely reach the desired coordinate field (X, Y) chen.

Further details emerge from the following Description with reference to the accompanying drawing; show it:

Fig. 1 is a very schematic perspective view of a chip card with an associated detector and

Fig. 2 is an analog view of the chip card to illustrate the meaning of the coordinates.

As can be seen, the reading direction 1 of the chip card 2 running in the direction of the longitudinal axis of the card must be taken into account both when it is issued and when it is used. In this case, whoever the foreign body 3 detected in terms of coordinates with the aid of a foreign body detector 4, and the measured values are passed from the detector 4 via a connecting cable. 5 The exact location of the foreign body 3 is determined and saved in the card chip 6 . In Fig. 2, the clock track 7 is schematically provides, which in the manner described above ensures the processing of foreign body information using the coordinates 9 of a foreign body belonging to the scanning track 8 .

Claims (9)

1. Method for checking the authenticity of documents in the form of chip cards or smart cards that enable one or more functions, for. B. as banking, cash and credit cards for dispensing money are used for debiting monetary units and / or as an ID document issued to motor vehicles or (to lassungsdokument, tachograph) key. Like. Are settable, characterized in that that the document consisting of a basic mass with embedded foreign bodies, the physical properties of which differ from those of the basic mass and have a random distribution in the basic mass, is scanned for at least one detector for foreign bodies in at least one scanning track selected by a random generator, that the output values of the detector are written into a chip provided in the chip card, after initialization locked first register, the stored content of which is neither readable nor comparable with other values from the outside, and that when using the document prepared in this way, its foreign body information from at least one Detector of the doc Entent receiving ter read and stored in a second register in parallel to the first register in the chip and internally compared with the foreign body pattern in the first register and evaluated in terms of a release of the document if the initial values match. 2. The method according to claim 1, characterized in that at the first exhibition along the selected trace output values determined by the at least one detector Clock pulses are assigned and that by collapse len of output values of the detector or detectors with the clock pulse generated foreign body patterns in the first register for the further evaluation can be registered.   3. Device for performing the method according to An saying 1 or 2, characterized in that the scanning track on the document a coordinate system to define Ab sampling points along the through the first register in the chip Chip card predetermined scan track is superimposed. 4. The device according to claim 3, characterized in that the abscissa of the coordinate system by a is formed over the forming clock track. 5. The device according to claim 3 or 4, characterized records that the clock track consists of marks that are in ih ren physical properties of those of the basic mass of the Document and its foreign bodies. 6. Device according to one of claims 3 to 5, characterized characterized in that the horizontal clock track with the first Foreign matter on the chip card begins. 7. Device according to one of claims 3 to 6, characterized characterized in that the chip on the chip card encrypts has rare information on the random distribution of foreign bodies. 8. Device according to one of claims 3 to 6 and 7, characterized in that for quickly reaching the desired coordinates a chip card drive for chip cards terminals with a through a clock frequency divider in the chip Chip card controlled stepper motor is provided by the encrypted information about random distribution is controlled. 9. Device according to one of claims 1 to 7, characterized characterized that the terminal with at least one foreign body detector is equipped through which the foreign body properties are recognizable and evaluable.