DE2917965A1 - DATA MEDIA, IN PARTICULAR ID CARD - Google Patents

Description

FP 13 / May 8, 1978. ^. Sul / ma * *. \ '\''",'·:";

DATAPLUS AG CH- 8623 WETZIKON (ZH)

Data carriers, in particular identity cards

909847/0644

The invention relates to a data carrier, in particular from

white card for people who have a facility in which the identification of a specific person is used Data are stored, with a device for the transmission of information being provided, by means of which the data carrier can be connected to a control station.

The purpose of such data carriers used as identification cards is, for example, buildings or areas, as well as certain ones To make zones within these buildings or areas accessible only to an authorized group of people. Are to the Access points control stations are provided in which the ID cards are inserted for identification. If the identification is positive during the data exchange between the card and the station, access is granted.

With the Swiss patent specification No. 546 446 is a data carrier become known, the one containing an individual personnel number primary memory, as well as a two Has information sequences generating, a secret memory containing information generator. The control station also contains an information generator which generates two pulse trains and has a secret memory. One on the Comparator arranged on a data carrier compares the respective first information sequences, with the

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carrier-side information organizer the second information sequence outputs to a comparator arranged in the control station. Now the second carrier-side agrees with the second station-side information sequence matches, a release signal generated. The carrier-side information generator and the comparator are embedded in plastic. About imitations of the data carrier by determining the memory content is in particular the secret memory of the information generator of randomly cast in plastic enclosed electrical lines, the laying of these lines with a random information controlled machine, so that the wiring is different from data carrier to data carrier. In one attempt To get to the secret memory, the lines could be interrupted, so that the stored information disappears would.

The disadvantage of this data carrier used as an identification card lies in particular in its limited applicability, whereby mainly the identification is in the foreground. Further Disadvantages are its complex, from a large number of individual, protected by special safety lines Components existing structure, as well as the resulting relatively expensive manufacturing costs. Also is the investigation the contents of the memory for the purpose of duplication by unauthorized persons not absolutely impossible if enough time is available.

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The invention is based on the object as an identity card To propose usable data carrier that does not have the above disadvantages and in particular for a wide Scope of application is suitable.

This object is achieved according to the invention in that the Set up a microcomputer with a microprocessor as the central unit, a read-only memory, input and output modules and at least one memory with direct access.

To ensure that the program of the microcomputer is not determined by unauthorized persons and the ID card is practical cannot be imitated, according to a preferred embodiment of the invention, the microcomputer is an exclusive Borrowed single-chip microcomputer with internal bus lines. The memory with direct access is used as a date memory, so that when the data carrier is checked in the control station within a period limited by an expiration date, the identification with both positive as well as negative result can be achieved, with a positive result postponed the expiry date and the this corresponding code word is changed, and that in the event of an inspection outside the period limited by the expiry date the identification only leads to a negative result.

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According to a further development of the invention for the purpose of prevention the improper use of the ID card, the memory with direct access of the microcomputer as Access counter used, with a positive result of the control within the period limited by the expiry date can be achieved if the number of accesses stored in the access counter is equal to that registered in the control station Access is, and after a positive check the access counter can be switched to one digit.

. The accompanying drawing shows an exemplary embodiment of the invention, which is explained in more detail below. ^

1 with a γ identity card, preferably made of plastic, is designated. One of at least one central | unit, a read-only memory, a memory with direct | Access as well as existing input and output devices | One-chip microcomputer 2, in which the BUS lines are not led out, is embedded in the plastic compound of the identity card 1. The microcomputer 2 is connected to a battery 3 that is replaceably arranged on the identity card 1. With 4 attached to the identity card 1, electrically connected to the microcomputer 2 contacts are referred to, via which the data exchange takes place when the identity card 1 is inserted into the control station.

The ID card 1 is used when allocated to a specific person

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son is initialized in an initialization station, with the program as well as the one tied to the person concerned Identity number and expiration date are entered into the memory with direct access. When inserting the ID card 1 in a control station used, for example, to monitor a door, the following, step-by-step data exchange takes place instead, the memory with direct access having the function of counting the accesses to the monitored door Access counter exercises.

1) The identification card 1 encodes the identity number and the expiry date and enters the relevant code words in the Control station.

2) The control station decodes these code words and compares them them on the basis of a table; if the result is positive and the number of accesses matches, step 3) follows, if the result is negative, step 7) follows.

3) The control station gives orders to the expiry date move and advance the access counter by one digit .

4) The ID card 1 acknowledges this command.

5) The control station unlocks the door.

6) The data exchange is finished.

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7) The control station sounds the alarm.

8) The data exchange is finished.

The advantages achieved with the invention consist in particular in the diverse application possibilities, since on one single identification card 1 several, from the respective control station Programs that can be called up during use for a wide variety of applications can be stored. Further advantages are that the period limited by the expiration date can be reduced as required can be, which makes duplicating the ID card practically impossible. Are for specific use cases However, if longer periods of time are required, this is the case with consecutive Use of a forged and the real, or the real and a forged identity card 1, because of the If the access meter reading no longer matches, identification is no longer possible. Another benefit arises in that when using a single-chip microcomputer with BüS lines that are not led out and only one-way charging is permitted Programming, a determination of the program by unauthorized persons is practically impossible. An added benefit it results from this that if the energy source 3 fails, e.g. if the ID card 1 is lost, which is stored in the memory with a direct Access saved identification data are lost, so that use by unauthorized persons is not possible.

The data exchange between the control station and the

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White card 1 can, instead of the contacts 4 given in the example, also have an inductive or an infrared effect working device take place.

The use of the identification card 1 according to the invention is limited does not affect the unlocking of a monitored door described in the example. It can also be used for department stores and banks not only in terms of identification, but also the arithmetic change of the on the ID card 1 saved account balance. Further application possibilities, for example, are the application as a key element for elevators with direct access to the apartment and use as a forgery-proof passport, whereby the identification data by means of, for example, pocket calculators suitable for this purpose from the responsible control bodies can be read, and conventional visas can be recorded and reproduced.

When using ID card 1 for increased security, the access data is changed depending on the time. To this For this purpose, the microcomputer 2 is equipped with a clock generator.

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Claims (10)

PATENT CLAIMS 1) Data carrier, in particular ID card for persons who have a Has device in which the identification of a specific Personal data are stored, with a device for the transmission of information being provided, by means of which the data carrier can be connected to a control station, characterized in that • that the device is a microcomputer (2) with a microprocessor as a central unit, a read-only memory, input and output modules and at least one memory with direct Access is. 2) data carrier according to claim 1, characterized that the microcomputer (2) is a single-chip microcomputer that has exclusively internal BÜS lines (2) is. ) Data carrier according to Claims 1 and 2, characterized in that - that the microcomputer (2) a program is an exclusively reading and non-writing block. 4) data carrier according to claims 1 and 2, characterized in that the microcomputer (2) on the data of the control station and the ID card (1) 903847/0644 ■ · · · · viii ■ f _ft φ - - w iigi ι ι ι ι · · II «» J »· It t »I1II · comparative building block is. 5) data carrier according to claims 1 and 2, characterized in that the microcomputer (2) one when checking the data carrier (1) in the control station its memory content in a predetermined manner changing building block is. 6) data carrier according to claims 1, 2, 4 and 5, characterized in that the memory with direct Access of the microcomputer (2) is a date memory, with the control of the data carrier (1) in the control station identification with both positive and is achievable with a negative result and, if the result is positive, the expiry date is postponed and the corresponding one Code word is changed, and when checking outside of the period limited by the expiry date, the Identification only leads to a negative result. 7) data carrier according to claims 1, 2, 4 and 5, characterized in that the memory with direct Access of the microcomputer (2) is an access counter, where- \ in the case of a positive result of the control within the ; the expiry date of a limited period can be achieved if the number of accesses stored in the access counter is equal to the accesses registered in the control station, and after a positive check the access counter can be switched one digit further. 909847/0644 , • »· · ι tilt c <ii ·« ■ «· Il · · 8) data carrier according to claims 1, 2, 4 and 5, characterized in that the microcomputer (2) is structured to decipher incoming encrypted commands and information and outgoing commands and Information encrypted. 9) data carrier according to claims 1, 2, 4 and 5, characterized in that the on the data carrier (1) arranged device contains the clock generator of the microcomputer (2). 10. Data carrier according to claims Ibis 5,8 and 9, characterized characterized in that the microcomputer (2) in the plastic identification card (1) on all sides is embedded surrounded by plastic. 909847/06 * 4