EP0385070B1 - Fernwirksystem mit durch Codeworte übertragbarem Code - Google Patents

Fernwirksystem mit durch Codeworte übertragbarem Code Download PDF

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Publication number
EP0385070B1
EP0385070B1 EP90100689A EP90100689A EP0385070B1 EP 0385070 B1 EP0385070 B1 EP 0385070B1 EP 90100689 A EP90100689 A EP 90100689A EP 90100689 A EP90100689 A EP 90100689A EP 0385070 B1 EP0385070 B1 EP 0385070B1
Authority
EP
European Patent Office
Prior art keywords
transmitter
code word
code
portions
receiver
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
EP90100689A
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German (de)
English (en)
French (fr)
Other versions
EP0385070A1 (de
Inventor
Martin Lindmayer
Klaus Claar
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0385070A1 publication Critical patent/EP0385070A1/de
Application granted granted Critical
Publication of EP0385070B1 publication Critical patent/EP0385070B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G07C9/00182—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
    • G07C9/00174—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

Definitions

  • the invention relates to a telecontrol system with code that can be physically transmitted with the features of the preamble of patent claim 1.
  • a known electronic locking device for motor vehicles comprising these features (DE 35 32 156 C2) with contactless transmission of code words between several transmitters and a vehicle-mounted receiver
  • the code words are generated on the transmitter and receiver side by a computer with two inputs.
  • Current counts from a sequence of numbers generated by sequence transmitters without influence by the use of the device are applied to each computer input.
  • At the other computer input in each case as a fixed part of the code word, there are unchangeably stored key figures for system-specific characterization of the association of lock and key pairs.
  • the transmitter-side computers then link the key figure with the current count from the sequence of numbers in accordance with a predetermined algorithm to form a disguised code word which passes as a signal between the transmitter and receiver.
  • each transmitter transmits an (unveiled) initialization code by pressing its send button, which, among other things, contains a transmitter-identifying order number that is stored individually for each key in the transmitter itself and in the receiver. These is not part of the actual code word, but enables the assignment of the current count on the receiver side to that of the currently used transmitter. No statement has been made about the repeated assignment of the order numbers.
  • a suitable initialization code is also a prerequisite for the possible resynchronization of the count of transmitter and receiver with the known device.
  • the code word received by the transmitter is analyzed in an unchangeable code number and count, and the latter is stored in the memory on the receiver side, assigned to the transmitter by means of a serial number, if an acknowledgment device by means of a mechanical device has been provided in good time beforehand Key was pressed.
  • the wirelessly transmitted code words of another known telecontrol system (DE 36 36 822 C1) are protected against unauthorized recording and use by synchronously advancing a portion of each code word considered to be current according to a predetermined algorithm in the receiver and in the last used transmitter.
  • the algorithm is based on a normally unchangeable original code word ("key code word") stored in EEPROMs in both the receiver and the transmitter. Due to the selected composition of each code word and the algorithm used, which only proceeds in one direction, a code word once used can only return identically after a very long period of time or after a very large number of increments. The unauthorized reuse of an illegally recorded code word is practically excluded.
  • each code word of the known telecontrol system can also contain so-called system bits which are used for different distinctions - e.g. B. key types (master / secondary key), car brand, key system, currently controllable function etc. - can be used. According to a variant of the known system, these system bits are excluded from the algorithmic change.
  • One or more system bits can, however, be changed arbitrarily by the user of the transmitter - by means of switches additionally provided on the transmitter button on the transmitter - in order to change the function which can be controlled or triggered by the transmitter without influencing the indexing algorithm.
  • the receiver can be switched manually to a "learning phase" using an electrical switch.
  • the key code word of the receiver is reprogrammed, and this necessarily includes the system bits mentioned, in that the code word transmitted next to the receiver by any transmitter suitable for the general system is re-stored. This new original code word is then accepted and stored as that which is subject to the subsequent algorithm for each subsequent code word transmission in accordance with the predetermined algorithm.
  • a code word stored in an existing transmitter can be completely reset by removing the battery from the transmitter. Then the "learning process" of the receiver described above - with the transmitter with reset code - can be carried out again. This is especially recommended to shorten the synchronization if the code words in the transmitter and receiver have been advanced at different distances. An unauthorized person can of course also carry out the described reset process in the transmitter by temporarily removing the battery from the transmitter in his possession.
  • a telecontrol system of a central locking system is also known (DE 32 44 049 C2) which, in one embodiment with several transmitters, provides a different set of code words from transmitter to transmitter. Since the code words of this telecontrol system are also advanced algorithmically, precautions must be taken which limit the code advance depending on the transmitter used to the limited code word supply individually assigned to it, in order to avoid unnecessary re-synchronization in the event of changing transmitter use. For this purpose, each transmitter is assigned different identifiers, which can be emitted primarily when the respective transmitter is actuated.
  • a decoder downstream of the receiver is equipped with a plurality of decoding channels, which correspond to the number of transmitters and which can be switched on by the transmitter identifiers, for processing the different number of code words from transmitter to transmitter.
  • the object of the invention is to design a generic telecontrol system so that an authorized user can continue to use the system with the same ease of use and without restriction of the high level of security against unauthorized use after the loss of a transmitter.
  • a total amount of basic parts of the code words - which can be generated by the algorithmic advancement - are assigned to the object individually, object-specifically and without any write access. Since almost any number of variations of a code word component can be created by electronic coding with relatively little effort, it is possible to assign a total amount of own, nowhere recurring object-specific code word basic components to each object, ie also to each motor vehicle of a type series.
  • each transmitter belonging to the object is assigned an unchangeable basic codeword component from this total, which is different for each transmitter and is used not only for code word formation but also for transmitter identification.
  • the total stock of all individual basic components stored in the object or receiver is greater than the number of available transmitters, ie those supplied for independent parallel use.
  • the control device is assigned a device for arbitrary, transmitter-independent resetting of only the changeable parts of all code words stored in the memory locations of the object to certain initial states.
  • the permanent, deprived of any write access storage of the object-specific parts can, for. B. in ROMs. It can be linked in a suitable manner to the only temporary storage of the changeable parts or else be available in completely, ie also physically separate, memories.
  • This has the advantage that, in contrast to the prior art, not any transmitter available in the spare parts trade for storing a new current code word in the receiver can be used even after a transmitter RESET has been carried out and the mechanical fuse has been overcome.
  • the object-specific, unchangeable portions of the code words are always transmitted and checked for agreement beforehand, but under no circumstances can they cause changes in the corresponding permanent memory contents in the object or receiver. It is obvious that the sale of replacement transmitters for such a system can be monitored much better and abuse can be made even more difficult.
  • An exchange of the object-specific basic components once assigned is only possible by exchanging the control device or the memory.
  • user-specific parts can also be contained in the basic parts, which already communicate certain user data to the recipient or the object when the transmitter is actuated.
  • Such user-specific code components are already known per se; they affect the automotive application of a telecontrol system such. B. from adjustable vehicle components such as seats or rear view mirrors.
  • the device for resetting the changeable code word basic components is preferably in the protected area of an object, for. B. in the passenger compartment of a motor vehicle, the central locking system is controllable by means of the remote control system.
  • the single figure shows the components of the telecontrol system essential for the invention in a highly schematic manner.
  • the code words CW ... are clearly shown here as sequences of decimal digits; it goes without saying that the type of code used and also the way in which the code words are transmitted between transmitter and receiver are completely irrelevant to the essence of the invention. Any type of code or transmission (infrared, ultrasound, radio) can be used.
  • the changeable parts CWV ... of the code words also clearly differ from one another; Since these are algorithmically advanced by the control device 1 after each code transmission independently of the other changeable parts, the same changeable parts CWV ... can occur at random once in two or more code words. Of course, these code words still differ in their basic components CWG ....
  • Each transmitter S1 to S3 contains a code - transmission element, here an infrared diode IS, which can be activated by pressing a transmit key ST to transmit the current code word CW ... stored in the respective transmitter.
  • the current code words CW1 to CW3 of the transmitters S1 to S3 completely match those in the memory locations SP1 to SP3 of the control device 1.
  • An infrared receiver IE of the motor vehicle K forwards each received code word CW ... in a known manner to the control device, where it is before execution any function controllable by transmitter S ... B. unlocking or locking the vehicle by a symbolically indicated, connected to the control device 1 central locking ZV - with the stored in the memory locations SP ... code words CW ... to complete agreement. If complete agreement has been found, the vehicle K is unlocked centrally in the exemplary embodiment in the execution of a controlled function “unlocking”.
  • the control device 1 naturally does not react to code words from a foreign or desynchronized transmitter. It goes without saying that more than just one receiver IE can also be provided; but it remains with a central control device.
  • this reset button 2 all changeable parts CWV 1 ... n of the code words CW 1 ... n in the memories SP 1 ... n of the control device 1 can be reset to defined initial states - which can also be different from one another - independently of a transmitter actuation will.
  • By resetting the vehicle owner can immediately prevent unauthorized persons from using the lost transmitter to control the function assigned to it if a transmitter is lost can.
  • the current code words in the transmitters are of course not reset.
  • a validation device 4 - By a validation device 4 - the z. B. can turn on a read lock for memory locations SP or control a deletion of the respective memory content - it is possible under the specific conditions already mentioned to devalue the unchangeable basic components CWG ... or the complete code words CW ..., the lost transmitters were assigned.
  • the validation device 4 is, for. B. activated by final actuation of the switch 3.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
  • Selective Calling Equipment (AREA)
EP90100689A 1989-02-24 1990-01-13 Fernwirksystem mit durch Codeworte übertragbarem Code Expired - Lifetime EP0385070B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3905651 1989-02-24
DE3905651A DE3905651A1 (de) 1989-02-24 1989-02-24 Verfahren zur sicherung von codeworten eines fernwirksystems und fernwirksystem mit durch codeworte uebertragbarem code

Publications (2)

Publication Number Publication Date
EP0385070A1 EP0385070A1 (de) 1990-09-05
EP0385070B1 true EP0385070B1 (de) 1994-02-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100689A Expired - Lifetime EP0385070B1 (de) 1989-02-24 1990-01-13 Fernwirksystem mit durch Codeworte übertragbarem Code

Country Status (5)

Country Link
US (1) US5159329A (enrdf_load_stackoverflow)
EP (1) EP0385070B1 (enrdf_load_stackoverflow)
JP (1) JPH0771339B2 (enrdf_load_stackoverflow)
DE (1) DE3905651A1 (enrdf_load_stackoverflow)
ES (1) ES2051390T3 (enrdf_load_stackoverflow)

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EP0481879A1 (fr) * 1990-10-17 1992-04-22 Alain Bernard Dispositif émetteur de sequences de signaux constituant un moyen de paiement
EP0535555A1 (en) * 1991-10-04 1993-04-07 Motorola, Inc. Programming technique for vehicular remote control system
EP0547725A1 (fr) * 1991-12-19 1993-06-23 Sté TEXTON Agencement de commande à distance d'un dispositif actionneur à l'aide d'un appareil de télécommande
FR2685525A1 (fr) * 1991-10-18 1993-06-25 Trw Sipea Spa Commande a distance pour un moyen de man oeuvre, en particulier pour un vehicule automobile.
EP0570761A1 (en) * 1992-05-18 1993-11-24 Lectron Products, Inc. Passive keyless entry system
WO1993022164A3 (en) * 1992-05-02 1993-12-23 Electronic Research And Design Security systems
US5621380A (en) * 1994-09-28 1997-04-15 Honda Giken Kogyo Kabushiki Kaisha Vehicle anti-theft device
US5872519A (en) * 1992-05-22 1999-02-16 Directed Electronics, Inc. Advanced embedded code hopping system
US6369693B1 (en) 1994-08-09 2002-04-09 U.S. Philips Corporation Method of, and system for, transferring secure data
US6393567B1 (en) 1996-02-15 2002-05-21 Elva Sa Method of enabling a server to authorize access to a service from portable devices having electronic microcircuits, e.g. devices of the smart card type
US6756878B2 (en) 1999-12-16 2004-06-29 Mannesmann Vdo Ag Apparatus for activating and/or deactivating a security device

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0481879A1 (fr) * 1990-10-17 1992-04-22 Alain Bernard Dispositif émetteur de sequences de signaux constituant un moyen de paiement
FR2668280A1 (fr) * 1990-10-17 1992-04-24 Bernard Alain Dispositif emetteur de sequences de signaux.
US5216716A (en) * 1990-10-17 1993-06-01 Alain Bernard Transmitting device of signal sequences
EP0535555A1 (en) * 1991-10-04 1993-04-07 Motorola, Inc. Programming technique for vehicular remote control system
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Also Published As

Publication number Publication date
DE3905651C2 (enrdf_load_stackoverflow) 1992-04-09
EP0385070A1 (de) 1990-09-05
DE3905651A1 (de) 1990-08-30
JPH02250497A (ja) 1990-10-08
JPH0771339B2 (ja) 1995-07-31
ES2051390T3 (es) 1994-06-16
US5159329A (en) 1992-10-27

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