EP0103790A2 - Coding method for an electronic key - Google Patents

Coding method for an electronic key Download PDF

Info

Publication number
EP0103790A2
EP0103790A2 EP83108588A EP83108588A EP0103790A2 EP 0103790 A2 EP0103790 A2 EP 0103790A2 EP 83108588 A EP83108588 A EP 83108588A EP 83108588 A EP83108588 A EP 83108588A EP 0103790 A2 EP0103790 A2 EP 0103790A2
Authority
EP
European Patent Office
Prior art keywords
transmitter
receiver
code
signal
electronic key
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83108588A
Other languages
German (de)
French (fr)
Other versions
EP0103790A3 (en
Inventor
Heinz Dipl.-Phys. Preissinger
Kurt Dipl.-Ing. Schwaiger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0103790A2 publication Critical patent/EP0103790A2/en
Publication of EP0103790A3 publication Critical patent/EP0103790A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/21—Individual registration on entry or exit involving the use of a pass having a variable access code
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00238—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed
    • G07C2009/00253—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed dynamically, e.g. variable code - rolling code
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00785—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/06—Involving synchronization or resynchronization between transmitter and receiver; reordering of codes

Definitions

  • the invention relates to a method for code security in an electronic key, in particular for motor vehicles with a built-in central locking system, which consists of a transmitter which emits a coded infrared signal which is received by a receiver tuned to the code, the code of Signal at the transmitter and receiver is adjustable.
  • the described copying option could only be prevented if the transmitter and receiver were brought so close together that a second receiver was not in the beam area of the transmitter.
  • this is difficult to achieve on the one hand in motor vehicles, since the receiver is arranged inside the vehicle, so that reflections, for example on the windows, can practically not be avoided, and on the other hand it contradicts also the convenient handling of such electronic locks.
  • An electronic key of the type mentioned is known from DE-A-29 06 665.
  • the known electronic key it is possible to adjust the code of the signal at the transmitter and at the receiver by means of switches. In this way, there is basically the possibility of changing the code, which can make unauthorized use of the vehicle more difficult.
  • the code on the transmitter and receiver will be set differently, so that the vehicle can no longer be unlocked.
  • the object of the invention is to provide a '.A process for code - to provide assurance for an electronic key of the type mentioned, is prevented by the secure manner in an unauthorized use of Kraftfährzeugen by copying the transmission-side signal.
  • This object is achieved in the method mentioned at the outset in that a number of code numbers 1 to n are stored in the transmitter and in the receiver and that a new matching code number is set automatically in the transmitter and receiver after each transmission and reception process .
  • code 0 is thus sent, for example, during the first unlocking attempt, the receiver also being matched to this code 0 is and the lock opens.
  • code 1 is sent, for example, to which the recipient is also sensitized and opens. This process continues until after the nth opening the coding sequence starts again with code 0.
  • the advantage of the method according to the invention is that the copying described above is possible in principle, but that the copied code is no longer valid on the next attempt, since the recipient is sensitized to the next code in the cyclical sequence.
  • the number and sequence of such a cycle can be freely selected and are only valid for a transmitter / receiver combination (key / lock combination).
  • One embodiment of the method according to the invention provides that the transmitter and receiver are electronically connected to one another after a unlocking process has been carried out and the respectively valid transmitter code is transmitted to the receiver. This is possible, for example, by connecting the transmitter and receiver using a plug connection while driving.
  • the transmitter sends a reset code when the device is initialized, so that the transmitter and receiver are synchronized to the same code. This ensures in each case that the sender and receiver are each matched to the same code number, i.e. run synchronously. Urinitialization is required, for example, if the power supply fails and batteries are replaced. Before the transmitter sends code 0, the transmitter starts with a reset code, which also causes the receiver to start with code 0.
  • a further development of the invention is that the receiver transmits an acknowledgment signal to the transmitter for switching to the next code after each unlocking.
  • This so-called "hand-shaking method" can advantageously be used to ensure synchronization during operation.
  • this requires a receiver on the transmitter side and a transmitter on the receiver side. For example, if the code is sent in groups of 3 x 8 bits, an acknowledgment signal can be sent after the first group. If this does not arrive, the further transmission of the code is stopped. Time criteria are possible for additional security.
  • FIG. 1 shows the block diagram of an electronic key, which consists of a transmitter 1 and a receiver 2.
  • the transmitter 1 controls, for example via the amplifier 3, a photodiode 4, which emits an infrared signal 5, which is picked up by a phototransistor 6.
  • the signal at the phototransistor 6 is fed via the amplifier 7 to the receiver 2, at the output 8 of which a signal 9 appears by which the central locking of the motor vehicle is controlled.
  • transmitter 1 and receiver 2 each consist of a CMOS microprocessor with subsequent amplifiers 3 and 7 and infrared transmitter diode 4 and infrared photo transistor 6.
  • a receiving diode can also be connected.
  • FIG. 2 shows an exemplary embodiment of an electronic key that works with an acknowledgment process (hand-shaking process).
  • the transmitter 10 controls via the amplifier 12 a photodiode 11 which emits the coded infrared signal 14 that is fed from the phototransistor 15 via the amplifier 16 to the receiver 11.
  • the signal 18 is present for controlling the central locking.
  • the receiver 11 has the possibility, via the amplifier 19, of driving the photodiode 20 which, after successful unlocking, transmits the signal 21 to the phototransistor 22, which feeds the acknowledgment signal to the transmitter 10 via the amplifier 23.
  • the method according to the invention allows an electronic key for motor vehicles to be designed to be theft-proof in a simple manner.
  • the transmitter can for example be of the order of a matchbox so that it can be carried easily.

Abstract

In the method for coding an electronic key, a number of code numbers 1 to n are stored in the transmitter (1) and in the receiver (2). After every transmission and reception operation a new identical code number is automatically set in the transmitter (1) and receiver (2). The transmitter (1) controls via an amplifier (3) a photodiode (4) which emits a coded infrared signal (5). This signal (5) is received by a phototransistor (6) which delivers it to the receiver (2) via an amplifier (7). At the output (8) of the receiver (2) there is a signal (9), by means of which the central locking system of a motor vehicle is actuated. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Code-Sicherung bei einem elektronischen Schlüssel, insbesondere für Kraftfahrzeuge mit eingebauter Zentralverriegelung, der aus einem Sender besteht, welcher ein codiertes Infrarot- Signal aussendet, das von einem auf den Code abgestimmten Empfänger aufgenommen wird, wobei der Code des Signals bei Sender und Empfänger verstellbar ist.The invention relates to a method for code security in an electronic key, in particular for motor vehicles with a built-in central locking system, which consists of a transmitter which emits a coded infrared signal which is received by a receiver tuned to the code, the code of Signal at the transmitter and receiver is adjustable.

Bei derartigen elektronischen Schlüsseln, bei denen vom Sender ein codiertes IR-Signal ausgestrahlt und auf der Empfängerseite entschlüsselt wird, besteht die Gefahr, daß das codierte Signal von jedem beliebigen Infrarot-Empfänger aufgenommen und anschließend gespeichert werden kann, wenn man sich während des Sendevorganges im Strahlbereich des IR-Senders befindet. Auf diese Weise läßt sich verhältnismäßig einfach eine Kopie des elektronischen Schlüssels herstellen, so daß es auch Unberechtigten ermöglicht wird, beispielsweise ein Kraftfahrzeug zu öffnen.In such electronic keys, in which a coded IR signal is emitted by the transmitter and decrypted on the receiver side, there is a risk that the coded signal can be picked up by any infrared receiver and then stored if one is in the transmission process in the Beam area of the IR transmitter is located. In this way, a copy of the electronic key can be made relatively easily, so that it is also possible for unauthorized persons to open a motor vehicle, for example.

Die beschriebene Kopiermöglichkeit ließe sich nur verhindern, wenn Sender und Empfänger so nahe zusammengebracht werden, daß ein zweiter Empfänger nicht im Strahlbereich des Senders liegt. Dies läßt sich jedoch einerseits bei Kraftfahrzeugen schlecht bewerkstelligen, da der Empfänger im Inneren des Fahrzeugs angeordnet ist, so daß sich Reflexionen beispielsweise an den Fenstern praktisch nicht vermeiden lassen und andererseits widerspricht es auch der bequemen Handhabung solcher elektronischen Schlösser.The described copying option could only be prevented if the transmitter and receiver were brought so close together that a second receiver was not in the beam area of the transmitter. However, this is difficult to achieve on the one hand in motor vehicles, since the receiver is arranged inside the vehicle, so that reflections, for example on the windows, can practically not be avoided, and on the other hand it contradicts also the convenient handling of such electronic locks.

Ein elektronischer Schlüssel der eingangs genannten Art ist aus der DE-A-29 06 665 bekannt. Beim bekannten elektronischen Schlüssel ist es möglich, den Code des Signales am Sender und am Empfänger mittels Schaltern zu'verstellen. Hierdurch besteht grundsätzlich die Möglichkeit, den Code zu ändern, wodurch die unbefugte Benutzung des Fahrzeuges erschwert werden kann. Es besteht jedoch die Gefahr, daß beispielsweise der Code an Sender und Empfänger unterschiedlich eingestellt wird, so daß sich das Fahrzeug nicht mehr aufschließen läßt. Auch wird ein Benutzer erfahrungsgemäß nicht nach jedem Aufschließvorgang einen neuen Code an Sender und Empfänger einstellen, so daß mit der oben beschriebenen Kopiermöglichkeit ein unbefugtes Benutzen des Fahrzeugs nicht ausgeschlossen wird.An electronic key of the type mentioned is known from DE-A-29 06 665. With the known electronic key, it is possible to adjust the code of the signal at the transmitter and at the receiver by means of switches. In this way, there is basically the possibility of changing the code, which can make unauthorized use of the vehicle more difficult. However, there is a risk that, for example, the code on the transmitter and receiver will be set differently, so that the vehicle can no longer be unlocked. Experience has also shown that a user will not set a new code to the transmitter and receiver after each unlocking process, so that unauthorized use of the vehicle cannot be ruled out with the copying option described above.

Aufgabe der Erfindung ist es, ein'.Verfahren zur Code - Sicherung bei einem elektronischen Schlüssel der eingangs genannten Art anzugeben, durch das in sicherer Weise ein unbefugtes Benutzen von Kraftfährzeugen durch Kopieren des sendeseitigen Signals verhindert wird.The object of the invention is to provide a '.A process for code - to provide assurance for an electronic key of the type mentioned, is prevented by the secure manner in an unauthorized use of Kraftfährzeugen by copying the transmission-side signal.

Diese Aufgabe wird bei dem eingangs genannten Verfahren erfindungsgemäß dadurch gelöst, daß im Sender und im Empfänger eine Anzahl von Code-Nummern 1 bis n gespeichert sind und daß nach jedem Sende- und Empfangsvorgang im Sender und Empfänger eine neue übereinstimmende Code-Nummer selbsttätig eingestellt wird.This object is achieved in the method mentioned at the outset in that a number of code numbers 1 to n are stored in the transmitter and in the receiver and that a new matching code number is set automatically in the transmitter and receiver after each transmission and reception process .

Beim erfindungsgemäßen Verfahren wird somit beim ersten Aufschließversuch beispielsweise der Code 0 gesendet, wobei der Empfänger ebenfalls auf diesen Code 0 abgestimmt ist und das Schloß öffnet. Beim zweiten Aufschließen wird beispielsweise der Code 1 gesendet, auf den der Empfänger ebenfalls sensibilisiert ist und öffnet. Dieser Vorgang setzt sich fort bis nach dem n-ten Öffnen die Codierreihenfolge wieder mit dem Code 0 beginnt.In the method according to the invention, code 0 is thus sent, for example, during the first unlocking attempt, the receiver also being matched to this code 0 is and the lock opens. When unlocked a second time, code 1 is sent, for example, to which the recipient is also sensitized and opens. This process continues until after the nth opening the coding sequence starts again with code 0.

Durch das erfindungsgemäße Verfahren wird der Vorteil erzielt, daß das oben beschriebene Kopieren zwar grundsätzlich möglich ist, daß der kopierte Code jedoch beim nächsten Versuch nicht mehr gültig ist, da der Empfänger jeweils auf den in der zyklischen Folge nächsten Code sensibilisiert ist. Zahl- und Reihenfolge eines solchen Zyklus sind frei wählbar und nur für eine Sende/Empfänger-Kombination (Schlüssel/Schloss-Kombination) gültig.The advantage of the method according to the invention is that the copying described above is possible in principle, but that the copied code is no longer valid on the next attempt, since the recipient is sensitized to the next code in the cyclical sequence. The number and sequence of such a cycle can be freely selected and are only valid for a transmitter / receiver combination (key / lock combination).

Eine Ausführungsform des erfindungsgemäßen Verfahrens sieht vor, daß Sender und Empfänger nach einem erfolgten Aufschließvorgang elektronisch miteinander verbunden werden und dabei der jeweils gültige Sendercode dem Empfänger übermittelt wird. Dies ist beispielsweise möglich, indem Sender und Empfänger während der Fahrt mittels einer Steckerverbindung verbunden werden.One embodiment of the method according to the invention provides that the transmitter and receiver are electronically connected to one another after a unlocking process has been carried out and the respectively valid transmitter code is transmitted to the receiver. This is possible, for example, by connecting the transmitter and receiver using a plug connection while driving.

Eine weitere Aüsführungsform besteht darin, daß bei Urinitialisierung der Sender einen Reset-Code sendet, damit Sender und Empfänger auf denselben Code synchronisiert werden. Hierdurch wird in jedem Fall sichergestellt, daß Sender und Empfänger jeweils auf die gleiche Code-Nummer abgestimmt sind, d.h. synchron laufen. Die Urinitialisierung ist beispielsweise bei Ausfall der Spannungsversorgung und der Neubestückung mit Batterien erforderlich. Dabei beginnt der Sender, bevor er den Code 0 sendet, mit einem Reset-Code, der den Empfänger ebenfalls mit Code 0 beginnen läßt.Another embodiment is that the transmitter sends a reset code when the device is initialized, so that the transmitter and receiver are synchronized to the same code. This ensures in each case that the sender and receiver are each matched to the same code number, i.e. run synchronously. Urinitialization is required, for example, if the power supply fails and batteries are replaced. Before the transmitter sends code 0, the transmitter starts with a reset code, which also causes the receiver to start with code 0.

Eine Weiterbildung der Erfindung besteht darin, daß der Empfänger nach jedem Aufschließen dem Sender ein Quittierungssignal zum Weiterschalten auf den nächsten Code übermittelt. Durch dieses sog. "hand-shaking-Verfahren" kann vorteilhaft eine Sicherung der Synchronisation im laufenden Betrieb erreicht werden. Hierzu ist allerdings auf der Senderseite ein Empfänger und auf der Empfängerseite ein Sender erforderlich. Sendet man den Code beispielsweise in Gruppen von 3 x 8 bit, so kann nach der ersten Gruppe bereits ein Quittierungssignal gesendet werden. Wenn dieses nicht eintrifft, wird die weitere Aussendung des Code gestoppt. Zur zusätzlichen Sicherung sind hierbei Zeitkriterien möglich.A further development of the invention is that the receiver transmits an acknowledgment signal to the transmitter for switching to the next code after each unlocking. This so-called "hand-shaking method" can advantageously be used to ensure synchronization during operation. However, this requires a receiver on the transmitter side and a transmitter on the receiver side. For example, if the code is sent in groups of 3 x 8 bits, an acknowledgment signal can be sent after the first group. If this does not arrive, the further transmission of the code is stopped. Time criteria are possible for additional security.

Weitere Vorteile des erfindungsgemäßen Verfahrens werden im Zusammenhang mit den folgenden Ausführungsbeispielen erläutert. In der dazugehörenden Zeichnung zeigen

  • Fig. 1 ein Blockschaltbild eines elektronischen Schlüssels und
  • Fig. 2 ein Blockschaltbild eines elektronischen Schlüssels mit Quittierungsbetrieb.
Further advantages of the method according to the invention are explained in connection with the following exemplary embodiments. Show in the accompanying drawing
  • Fig. 1 is a block diagram of an electronic key and
  • Fig. 2 is a block diagram of an electronic key with acknowledgment operation.

In der Figur 1 ist das.Blockschaltbild eines elektronischen Schlüssels dargestellt, der aus einem Sender 1 und einem Empfänger 2 besteht. Der Sender 1 steuert beispielsweise über den Verstärker 3 eine Fotodiode 4 an, welche ein Infrarotsignal 5 aussendet, das von einem Fototransistor 6 aufgenommen wird. Das Signal am Fototransistor 6 wird über den Verstärker 7 dem Empfänger 2 zugeleitet, an dessen Ausgang 8 ein Signal 9 erscheint, durch das die Zentralverriegelung des Kraftfahrzeuges gesteuert wird.FIG. 1 shows the block diagram of an electronic key, which consists of a transmitter 1 and a receiver 2. The transmitter 1 controls, for example via the amplifier 3, a photodiode 4, which emits an infrared signal 5, which is picked up by a phototransistor 6. The signal at the phototransistor 6 is fed via the amplifier 7 to the receiver 2, at the output 8 of which a signal 9 appears by which the central locking of the motor vehicle is controlled.

Beispielsweise bestehen Sender 1 und Empfänger 2 aus je einem CMOS-Mikroprozessor mit nachfolgenden Verstärkern 3 bzw. 7 und Infrarotsendediode 4 und Infrarotfototransistor 6. Anstelle des Fototransistors 6 kann auch eine Empfangsdiode geschaltet sein. Diese Anordnung bietet in einfacher Weise eine. große Anzahl von Codiermöglichkeiten. Bei einem sogenannten "m-Bit-Telegramm" ergibt dies 2m- Kombinationen, mit m = 24 z. B. 16 Millionen. Nimmt man beispielsweise pro Fahrzeug n (z.B. 10 Codes),so vermindert sich die Zahl der Möglichkeiten zwar auf 1/n (1,6 Millionen), berücksichtigt man aber die Reihenfolge, so ergeben sich pro Fahrzeug wieder n ! Permutationen der Reihenfolge dieser n-Codes und somit 10 !, also 3,6 Millionen. Bei n = 11 ergeben sich ca. 40 Millionen Kombinationsmöglichkeiten. Diese Kombinationsmöglichkeiten werden in geeigneter Weise ausgewählt und gespeichert, so daß bei der Fabrikation sichergestellt ist, daß ein Fahrzeug mit nur einem Codesatz funktioniert, daß also nur ein Schlüssel für ein Fahrzeug existiert.For example, transmitter 1 and receiver 2 each consist of a CMOS microprocessor with subsequent amplifiers 3 and 7 and infrared transmitter diode 4 and infrared photo transistor 6. Instead of photo transistor 6, a receiving diode can also be connected. This arrangement offers a simple. large number of coding options. With a so-called "m-bit telegram" this results in 2 m combinations, with m = 24 z. B. 16 million. If, for example, you take n (for example 10 codes) per vehicle, the number of options decreases to 1 / n (1.6 million), but if you take the sequence into account, there are n again for each vehicle! Permutations of the order of these n-codes and thus 10 !, i.e. 3.6 million. With n = 11 there are approx. 40 million possible combinations. These possible combinations are selected and stored in a suitable manner so that it is ensured during manufacture that a vehicle works with only one code set, that is to say that there is only one key for one vehicle.

In der Figur 2 ist ein Ausführungsbeispiel eines elektronischen Schlüssels dargestellt, der mit einem Quittierungsverfahren (hand-shaking-Verfahren) arbeitet. Der Sender 10 steuert über den Verstärker 12 eine Fotodiode 11 an, welche das codierte Infrarot-Signal 14 aussendet, daß vom Fototransistor 15 über den Verstärker 16 dem Empfänger 11 zugeleitet wird. Am Ausgang 17 des Empfängers 11 steht das Signal 18 zur Steuerung der Zentralverriegelung an. Der Empfänger 11 besitzt über den Verstärker 19 die Möglichkeit, die Fotodiode 20 anzusteuern, die nach dem erfolgreichen Aufschließen das Signal 21 dem Fototransistor 22 übermittelt, der über den Verstärker 23 dem Sender 10 das Quittierungssignal zuleitet.FIG. 2 shows an exemplary embodiment of an electronic key that works with an acknowledgment process (hand-shaking process). The transmitter 10 controls via the amplifier 12 a photodiode 11 which emits the coded infrared signal 14 that is fed from the phototransistor 15 via the amplifier 16 to the receiver 11. At the output 17 of the receiver 11, the signal 18 is present for controlling the central locking. The receiver 11 has the possibility, via the amplifier 19, of driving the photodiode 20 which, after successful unlocking, transmits the signal 21 to the phototransistor 22, which feeds the acknowledgment signal to the transmitter 10 via the amplifier 23.

Das erfindungsgemäße Verfahren gestattet in einfacher Weise, einen elektronischen Schlüssel für Kraftfahrzeuge diebstahlsicher auszubilden. Der Sender kann dabei beispielsweise in der Größenordnung einer Streichholzschachtel ausgebildet sein, so daß er bequem mitgeführt werden kann.The method according to the invention allows an electronic key for motor vehicles to be designed to be theft-proof in a simple manner. The transmitter can for example be of the order of a matchbox so that it can be carried easily.

Claims (4)

1. Verfahren zur Code-Sicherung bei einem elektronischen Schlüssel, insbesondere für Kraftfahrzeuge mit eingebauter Zentralverriegelung, der aus einem Sender besteht, welcher ein codiertes Infrarot-Signal aussendet, das von einem auf den Code abgestimmten Empfänger aufgenommen wird,wobei der Code des Signals bei Sender und Empfänger verstellbar ist, dadurch gekennzeichnet, daß im Sender (1, 10) und im Empfänger (2, 11) eine Anzahl von Code-Nummern 1 bis n gespeichert sind, und daß nach jedem Sende- und Empfangsvorgang im Sender (1, 10) und Empfänger (2, 11) eine neue übereinstimmende Code-Nummer selbsttätig eingestellt wird.1. A method for code securing an electronic key, in particular for motor vehicles with a built-in central locking system, which consists of a transmitter which emits a coded infrared signal which is received by a receiver tuned to the code, the code of the signal being The transmitter and receiver can be adjusted, characterized in that a number of code numbers 1 to n are stored in the transmitter (1, 10) and in the receiver (2, 11), and that after each transmission and reception process in the transmitter (1, 10) and the receiver (2, 11) a new matching code number is set automatically. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß Sender (1, 10) und Empfänger (2, 11) nach einem erfolgten Aufschließvorgang elektronisch miteinander verbunden werden und dabei der jeweils gültige Sendercode dem Empfänger (2, 11) übermittelt wird.2. The method according to claim 1, characterized in that the transmitter (1, 10) and receiver (2, 11) are electronically connected to each other after a unlocking process and the respectively valid transmitter code is transmitted to the receiver (2, 11). 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei Urinitialisierung der Sender (1, 10) einen Reset-Code sendet, damit Sender (1, 10) und Empfänger (2, 11) auf denselben Code synchronisiert werden.3. The method according to claim 1 or 2, characterized in that in the case of urinitialization of the transmitter (1, 10) sends a reset code so that transmitter (1, 10) and receiver (2, 11) are synchronized to the same code. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Empfänger (11) nach jedem Aufschließen dem Sender (10) ein Quittierungssignal zum Weiterschalten auf den nächsten Code übermittelt.4. The method according to any one of claims 1 to 3, characterized in that the receiver (11) after each unlocking the transmitter (10) transmits an acknowledgment signal for switching to the next code.
EP83108588A 1982-09-17 1983-08-31 Coding method for an electronic key Withdrawn EP0103790A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823234538 DE3234538A1 (en) 1982-09-17 1982-09-17 METHOD FOR SECURING THE CODE OF AN ELECTRONIC KEY
DE3234538 1982-09-17

Publications (2)

Publication Number Publication Date
EP0103790A2 true EP0103790A2 (en) 1984-03-28
EP0103790A3 EP0103790A3 (en) 1984-09-05

Family

ID=6173509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108588A Withdrawn EP0103790A3 (en) 1982-09-17 1983-08-31 Coding method for an electronic key

Country Status (2)

Country Link
EP (1) EP0103790A3 (en)
DE (1) DE3234538A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536781A1 (en) * 1982-11-27 1984-06-01 Kiekert Gmbh Co Kg CENTRAL LOCKING INSTALLATION FOR A MOTOR VEHICLE
EP0307749A1 (en) * 1987-09-14 1989-03-22 Siemens Aktiengesellschaft Method for optical data transmission between two galvanically separated transmission and reception devices
EP0813170A2 (en) * 1996-06-03 1997-12-17 Werner Dipl.-Ing. Eckel Electronic access authorisation system and method for detecting authorised access
US6175312B1 (en) 1990-05-29 2001-01-16 Microchip Technology Incorporated Encoder and decoder microchips and remote control devices for secure unidirectional communication
WO2005018103A1 (en) * 2003-08-13 2005-02-24 Philips Intellectual Property & Standards Gmbh Method and device for encrypting a digital data stream in a transmission system
US6980655B2 (en) 2000-01-21 2005-12-27 The Chamberlain Group, Inc. Rolling code security system
US10652743B2 (en) 2017-12-21 2020-05-12 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US10862924B2 (en) 2005-06-30 2020-12-08 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
US10944559B2 (en) 2005-01-27 2021-03-09 The Chamberlain Group, Inc. Transmission of data including conversion of ternary data to binary data
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
US11423717B2 (en) 2018-08-01 2022-08-23 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636822C2 (en) * 1986-10-29 1993-12-23 Ruf Kg Wilhelm Electronic remote control device, in particular for central locking systems of motor vehicles
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
CA2193846C (en) 1995-05-17 2004-02-17 Bradford L. Farris Rolling code security system
US6690796B1 (en) 1995-05-17 2004-02-10 The Chamberlain Group, Inc. Rolling code security system
US6108326A (en) 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2922230A1 (en) * 1979-04-10 1980-10-23 Martin H Gygi SENDING INFORMATION CARRIER AND RECEIVER DEVICE
GB1582989A (en) * 1977-11-23 1981-01-21 Motorola Inc Security systems
GB1595797A (en) * 1978-04-21 1981-08-19 Pushman Hugh John Security systems
WO1982002811A1 (en) * 1981-02-06 1982-08-19 Avi N Nelson Security system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1582989A (en) * 1977-11-23 1981-01-21 Motorola Inc Security systems
GB1595797A (en) * 1978-04-21 1981-08-19 Pushman Hugh John Security systems
DE2922230A1 (en) * 1979-04-10 1980-10-23 Martin H Gygi SENDING INFORMATION CARRIER AND RECEIVER DEVICE
WO1982002811A1 (en) * 1981-02-06 1982-08-19 Avi N Nelson Security system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Band 14, Nr. 12, Mai 1972, Seiten 3860-3861, Armonk, New York 10504, US G.V.A. MALMROS: "Access control system" *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536781A1 (en) * 1982-11-27 1984-06-01 Kiekert Gmbh Co Kg CENTRAL LOCKING INSTALLATION FOR A MOTOR VEHICLE
EP0307749A1 (en) * 1987-09-14 1989-03-22 Siemens Aktiengesellschaft Method for optical data transmission between two galvanically separated transmission and reception devices
US6175312B1 (en) 1990-05-29 2001-01-16 Microchip Technology Incorporated Encoder and decoder microchips and remote control devices for secure unidirectional communication
EP0813170A2 (en) * 1996-06-03 1997-12-17 Werner Dipl.-Ing. Eckel Electronic access authorisation system and method for detecting authorised access
EP0813170A3 (en) * 1996-06-03 1999-04-28 Werner Dipl.-Ing. Eckel Electronic access authorisation system and method for detecting authorised access
US6980655B2 (en) 2000-01-21 2005-12-27 The Chamberlain Group, Inc. Rolling code security system
WO2005018103A1 (en) * 2003-08-13 2005-02-24 Philips Intellectual Property & Standards Gmbh Method and device for encrypting a digital data stream in a transmission system
US10944559B2 (en) 2005-01-27 2021-03-09 The Chamberlain Group, Inc. Transmission of data including conversion of ternary data to binary data
US11799648B2 (en) 2005-01-27 2023-10-24 The Chamberlain Group Llc Method and apparatus to facilitate transmission of an encrypted rolling code
US10862924B2 (en) 2005-06-30 2020-12-08 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
US11122430B2 (en) 2017-12-21 2021-09-14 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US11778464B2 (en) 2017-12-21 2023-10-03 The Chamberlain Group Llc Security system for a moveable barrier operator
US10652743B2 (en) 2017-12-21 2020-05-12 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
US11763616B1 (en) 2018-06-27 2023-09-19 The Chamberlain Group Llc Network-based control of movable barrier operators for autonomous vehicles
US11423717B2 (en) 2018-08-01 2022-08-23 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network
US11869289B2 (en) 2018-08-01 2024-01-09 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training
US11462067B2 (en) 2019-05-16 2022-10-04 The Chamberlain Group Llc In-vehicle transmitter training

Also Published As

Publication number Publication date
EP0103790A3 (en) 1984-09-05
DE3234538A1 (en) 1984-03-22

Similar Documents

Publication Publication Date Title
EP0103790A2 (en) Coding method for an electronic key
DE4428947C1 (en) Coded remote operation of vehicle central locking system
DE4434587B4 (en) Electronic ignition lock system on a motor vehicle
EP0212046B1 (en) System for locking and/or unlocking a security device
EP0385070B1 (en) Remote control system with a code transmitted by code words
DE3244049C2 (en) Central locking system for a motor vehicle
DE4418069C1 (en) Security device with electronically encoded access authorisation
DE4434655C2 (en) Electronic ignition lock system on a motor vehicle
EP0103791A2 (en) Coding method for an electronic key
EP0720545B2 (en) Electronic ignition lock system for motor vehicles
DE4409559A1 (en) Key for car central door locking system
DE3327720A1 (en) METHOD AND DEVICE FOR OPERATING AN ELECTRONIC SAFETY DEVICE
WO1995009746A1 (en) Locking system, in particular for motor vehicles
DE4329697A1 (en) Remote controllable access control device
DE3306863C2 (en) Lock system for motor vehicles, in particular steering lock system
DE4444913A1 (en) Electronic key for automobile centralised locking system
EP1455319A2 (en) Electric hand tool with antitheft system and method for its operation
EP0128457A2 (en) Coding method for an electronic key
EP1041224A2 (en) Device and method for releasing a secure system, especially a motor vehicle access system
WO1994018036A1 (en) Remote-controlled protection system for a motor vehicle
EP0154019B1 (en) Coding method for an electronic key
DE2824421C2 (en) Switching arrangement for operating locking devices and similar safety devices, in particular as theft protection on a motor vehicle
DE4434571A1 (en) Electronic door-locking system on a motor vehicle
DE2911828A1 (en) Radio controlled door lock for vehicle - has key transmitting PCM signals to receiver in lock containing demodulator and code comparator
DE3407469A1 (en) METHOD FOR SECURING THE CODE OF AN ELECTRONIC KEY

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE FR GB SE

17P Request for examination filed

Effective date: 19841026

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19870202

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHWAIGER, KURT, DIPL.-ING.

Inventor name: PREISSINGER, HEINZ, DIPL.-PHYS.