EP1093101B1 - Verfahren zum automatischen Synchronisieren eines Fernbedienungsschlüssels mit einem dazugehörigen Rechner - Google Patents

Verfahren zum automatischen Synchronisieren eines Fernbedienungsschlüssels mit einem dazugehörigen Rechner Download PDF

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Publication number
EP1093101B1
EP1093101B1 EP20000122485 EP00122485A EP1093101B1 EP 1093101 B1 EP1093101 B1 EP 1093101B1 EP 20000122485 EP20000122485 EP 20000122485 EP 00122485 A EP00122485 A EP 00122485A EP 1093101 B1 EP1093101 B1 EP 1093101B1
Authority
EP
European Patent Office
Prior art keywords
code
key
computer
vehicle
challenge
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.)
Expired - Lifetime
Application number
EP20000122485
Other languages
English (en)
French (fr)
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EP1093101A1 (de
Inventor
Alain Brillon
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.)
Continental Automotive France SAS
Original Assignee
Continental Automotive France SAS
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 Continental Automotive France SAS filed Critical Continental Automotive France SAS
Publication of EP1093101A1 publication Critical patent/EP1093101A1/de
Application granted granted Critical
Publication of EP1093101B1 publication Critical patent/EP1093101B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • 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
    • 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
    • G07C2009/00793—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 Hertzian waves
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/20—Binding and programming of remote control devices
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/60—Security, fault tolerance
    • G08C2201/62—Rolling code
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/90—Additional features
    • G08C2201/91—Remote control based on location and proximity

Definitions

  • the present invention relates to a method of automatic synchronization between a remote control key and an associated computer. More particularly, it is a remote control for locking / unlocking the opening of a vehicle.
  • Such remotes are widely used nowadays. They allow, for example, to open or close the doors of a vehicle remotely. To do this, and to avoid any fraud or unauthorized opening, the codes issued between the key and the computer controlling the locking / unlocking of the doors, no longer use fixed codes but so-called rotating codes.
  • the codes issued between the key and the computer are so-called rotating codes.
  • Such codes are calculated at each transmission from an algorithm known by the key and by the computer according to the preceding code and an increment.
  • Such rotating codes give good results, since the code issued by a key to a given vehicle is never the same. Thus, it is no longer enough to copy a code issued to access the vehicle.
  • the object of the present invention is to establish a method of resynchronization between a key and a computer automatically, in the most transparent manner and as fast as possible for the user.
  • the synchronization requires only a normal support by the driver on the key, the first and second messages being generated automatically and quickly terminating the resynchronization.
  • the driver may not be aware that the key has been resynchronized because the transmission of all messages is very fast.
  • the messages are transmitted radiofrequency which limits the realization of the resynchronization procedure to a few meters around the vehicle (about 4 to 5 m). This limits the possibility of copying or to analyze the messages exchanged, because it would be necessary that the ill-intentioned person is placed next to the vehicle.
  • the communication in the vehicle / key direction is performed using a low frequency (LF) of the order of 125 KHz for example.
  • LF low frequency
  • the resynchronization method according to the present invention is performed between a key 10 and a motor vehicle 11 to which it is assigned.
  • This key 10 is provided with an electronic calculator 12 comprising radiofrequency transmission and reception units, as well as means for creating such signals. These means are well known in them and are not detailed here.
  • the key 10 has memory means M1 of a vehicle-specific algorithm and storage means M2 of a key algorithm.
  • the electronic computer 12 is adapted to manage all of these means.
  • the motor vehicle 11 is provided with a computer 13 managing means M1 for memorizing the algorithm specific to the vehicle and M2 memory means of the algorithm specific to the key.
  • This computer 13 is adapted to control at least the locking / unlocking of the opening of the vehicle 11.
  • the computer 13 exchanges radiofrequency signals with the electronic computer 12 disposed in the key 10.
  • this computer 13 exchanges low frequency signals (LF) with the key.
  • LF low frequency signals
  • step 20 the sending of a locking command C or unlocking D (step 20 ) by the key is received ( step 30 ) by the computer 13 of the vehicle.
  • This computer 13 controls the conviction C or unlocking D ( step 50 ) of the opening, after verification (step 40 ) that the code sent by the key is in its list of available codes (this list is continuously updated in a known manner in itself).
  • step 40 the computer 13 detects a significant desynchronization, the method according to the present invention ( steps 60 to 100 ) is implemented.
  • the challenge code is a random number generated by the computer 13.
  • the response code associated with this challenge code is the code obtained by the computer when it applies the algorithm M1 to the random number (challenge code).
  • This algorithm M1 is an algorithm specific to the calculator and is known to the key.
  • the response of the key 10 to the challenge code sent by the computer is obtained by applying the algorithm M2 specific to the key to the random number (challenge code).
  • This algorithm M2 is also known from the computer 13.
  • the key 10 memorizes the challenge code and considers it as its new basic code of the remote control. It thus updates its base code ( step 75 ).
  • the computer 13 receives this second message (step 80) and verifies that it is correct. For this purpose, it verifies that it finds the same response code by applying the algorithm M2. If this is the case, the computer 13 updates its base code ( step 100 ) by taking the challenge code as the new base code. The conviction or unlocking requested by the key is then allowed ( step 50 ).
  • the new base code of the remote control being the challenge code sent by the computer.
  • step 90 If the response code sent by the key is not correct, the resynchronization process stops (step 90 ).
  • this resynchronization procedure is substantially transparent (not detectable) for the user.
  • the time taken to exchange the first and second messages is insignificant and does not significantly prolong the conventional conviction / unlocking procedure. Only the range of the remote control is reduced for the duration of the resynchronization.
  • the new base code not the challenge code but the response code (which is a function of the challenge code).
  • the scope of the key being important, the use of this response code facilitates the spying of the transmissions between the key and the computer. For some applications, this may very well not be a disadvantage.
  • the present invention is not limited to the embodiment described and encompasses any variant within the reach of those skilled in the art.
  • the new code of condemnation / unlocking (still called basic code) could be not the challenge code sent by the key but a function of this code challenge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)

Claims (6)

  1. Verfahren zum automatischen Synchronisieren eines Fernbedienungsschlüssels (10) mit einem Rechner (13), der in einem Kraftfahrzeug angeordnet ist, das diesem Schlüssel zugeordnet ist, wobei der Befehlsaustausch zwischen dem Schlüssel und dem Rechner mithilfe eines Rolling-Codes erfolgt und zumindest die Verriegelung / Entriegelung der Türen des Fahrzeugs ermöglicht, wobei das Verfahren folgende Schritte umfasst:
    - Aussenden eines Codes für die Verriegelung / Entriegelung der Türen des Fahrzeugs durch den Schlüssel (Schritt 20),
    - Empfangen des gesendeten Codes durch den Rechner und Analysieren dieses Codes (Schritt 30),
    - Erfassen einer Desynchronisation zwischen einem vom Rechner erwarteten Code und dem vom Schlüssel gesendeten Code (Schritt 40),
    wobei das Verfahren dadurch gekennzeichnet ist, dass es ferner folgende Schritte umfasst:
    - Aussenden einer ersten Nachricht durch den Rechner (13), umfassend einen Desynchronisationscode, einen so genannten Challenge-Code und seinen dazugehörigen Antwortcode, so wie er vom Rechner gemäß einem Algorithmus (M1), der dem Rechner eigen und dem Schlüssel bekannt ist, bestimmt wird (Schritt 60),
    - Empfangen (Schritt 70) der ersten Nachricht durch den Schlüssel und deren Analyse, um den Schlüssel über die Desynchronisation zu informieren und um den vom Rechner gesendeten Antwortcode zu bestätigen, wobei der Schlüssel schließlich eine zweite Nachricht aussendet, die seine eigene Antwort auf eben diesen Challenge-Code umfasst, wobei diese Antwort ausgehend von einem Algorithmus (M2), der dem Schlüssel eigen und dem Rechner bekannt ist, bestimmt wird, wobei der Schlüssel den vom Rechner gesendeten Challenge-Code als Basiscode speichert (Schritt 75), und
    - Empfangen (Schritt 80) der zweiten Nachricht durch den Rechner und deren Analyse, um zu überprüfen, dass der gesendete Antwortcode auch tatsächlich jener des Schlüssels ist, der dem Fahrzeug zugeordnet ist, wobei sich in diesem Fall der Rechner mit dem Schlüssel neu synchronisiert, wobei der Challenge-Code als neuer Basiscode (Schritt 100) für die Fernbedienung der Türen des Fahrzeugs verwendet wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Challenge-Code, der vom Rechner ausgesendet wird, ein Zufallscode ist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Befehlsaustausch zwischen dem Schlüssel und dem Rechner mithilfe von Hochfrequenzsignalen erfolgt.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Synchronisation des Schlüssels mit dem Rechner des Fahrzeugs in einem Umkreis von etwa 4 m rund um das Fahrzeug stattfindet.
  5. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Befehlsaustausch vom Rechner (13) zum Schlüssel (10) mithilfe eines Niederfrequenzsignals LF erfolgt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der neue Basiscode eine Funktion des Challenge-Codes ist.
EP20000122485 1999-10-15 2000-10-13 Verfahren zum automatischen Synchronisieren eines Fernbedienungsschlüssels mit einem dazugehörigen Rechner Expired - Lifetime EP1093101B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9912867A FR2799862B1 (fr) 1999-10-15 1999-10-15 Procede de synchronisation automatique entre une clef de telecommande et un calculateur associe
FR9912867 1999-10-15

Publications (2)

Publication Number Publication Date
EP1093101A1 EP1093101A1 (de) 2001-04-18
EP1093101B1 true EP1093101B1 (de) 2008-12-03

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EP20000122485 Expired - Lifetime EP1093101B1 (de) 1999-10-15 2000-10-13 Verfahren zum automatischen Synchronisieren eines Fernbedienungsschlüssels mit einem dazugehörigen Rechner

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EP (1) EP1093101B1 (de)
DE (1) DE60040957D1 (de)
FR (1) FR2799862B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827987B1 (fr) * 2001-07-27 2003-10-10 Siemens Automotive Sa Procede de commande de resynchronisation d'une telecommande a code tournant
MY168112A (en) * 2010-10-08 2018-10-11 Honda Lock Mfg Co Ltd Vehicle key and answerback device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523117B1 (de) * 1990-04-06 1994-08-24 Siemens Aktiengesellschaft Zentralverriegelungsanlage für ein kraftfahrzeug
US5191610A (en) * 1992-02-28 1993-03-02 United Technologies Automotive, Inc. Remote operating system having secure communication of encoded messages and automatic re-synchronization
US5369706A (en) * 1993-11-05 1994-11-29 United Technologies Automotive, Inc. Resynchronizing transmitters to receivers for secure vehicle entry using cryptography or rolling code
EP0727117B1 (de) * 1993-11-05 2000-03-15 Lear Automotive Dearborn, Inc. Verfahren zur automatischen resynchronisation des sender-/empfängergeräts in einem schlüsselosen eingangssystem
US5923758A (en) * 1997-01-30 1999-07-13 Delco Electronics Corp. Variable key press resynchronization for remote keyless entry systems

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Publication number Publication date
DE60040957D1 (de) 2009-01-15
EP1093101A1 (de) 2001-04-18
FR2799862B1 (fr) 2001-12-14
FR2799862A1 (fr) 2001-04-20

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