FR2607544A1 - Electronic lock with periodic code change - Google Patents

Electronic lock with periodic code change Download PDF

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Publication number
FR2607544A1
FR2607544A1 FR8616549A FR8616549A FR2607544A1 FR 2607544 A1 FR2607544 A1 FR 2607544A1 FR 8616549 A FR8616549 A FR 8616549A FR 8616549 A FR8616549 A FR 8616549A FR 2607544 A1 FR2607544 A1 FR 2607544A1
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FR
Grant status
Application
Patent type
Prior art keywords
code
time
electronic lock
characterized
message
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Withdrawn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
FR8616549A
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French (fr)
Inventor
Patrick Philippe
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.)
Neiman
Original Assignee
Neiman
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

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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 entry or exit registers
    • 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
    • G06—COMPUTING; CALCULATING; COUNTING
    • G06K—RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/04—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the shape
    • G06K19/041—Constructional details
    • G06K19/048—Constructional details the record carrier being shaped as a key
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING; COUNTING
    • G06K—RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING; COUNTING
    • G06K—RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • 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 entry or exit registers
    • 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
    • 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 entry or exit registers
    • 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

Abstract

The invention relates to an electronic lock with a variable code of the type comprising an encoded-message emitter 1 and a receiver 6 for the said message, which receiver is formed by means 7 for reading the said received message, comparing the said received message with a message stored in memory, and emitting a control signal when the said messages agree. The electronic lock according to the invention is characterised in that the code varies as a function of time. Application to the motor vehicle industry. <IMAGE>

Description

Serrure électronique à changement de code périodique. electronic lock code changes periodically.

L'invention concerne une serrure électronique à code variable du type comprenant un émetteur d'un message codé et un récepteur dudit message formé de moyens de lecture dudit message reçu, de comparaison dudit message reçu-à un message contenu en mémoire et d'émission d'un signal de commande en cas de concordance entre lesdits messages. The invention relates to an electronic lock code variable of the type comprising a transmitter an encoded message and a receiver of said message formed reading means of said received message, comparing said received message to a message contained in the memory and transmitting a control signal in case of agreement between said messages.

Une telle serrure électronique peut par exemple être utilisée comme télécommande d'accès à un véhicule automobile et/ ou d'utilisation de ce véhicule. Such an electronic lock can for example be used as a remote access to a motor vehicle and / or use of the vehicle.

Dans les serrures électroniques connues, le message codé est fixe, ce qui présente l'inconvénient majeur d'une reproduction relativement facile lorsque le message codé a été enregistré. In known electronic locks, the encoded message is fixed, which has the major relatively easy reproduction drawback when the encoded message has been recorded.

Pour pallier cet inconvénient, on a proposé de faire varier le code, par exemple à chaque utilisation, selon une loi plus ou moins aléatoire. To overcome this drawback, it is proposed to vary the code, for example, each use, according to a more or less random act. Cette variation de code entraîne des difficultés de synchronisation entre émetteur et récepteur et une complication de l'ensemble de la serrure électronique. This variation code causes difficulties of synchronization between transmitter and receiver and a complication of the entire electronic lock.

La présente invention vise à faire varier le code de maniere simple et sûre, afin d'augmenter considérablement la sécurité par rapport à un code fixe tout en limitant et simplifiant les problèmes de synchronisation entre émetteur et récepteur. The present invention aims to vary the code simple and safe manner, in order to greatly increase the security with respect to a fixed code while minimizing and simplifying the problems of synchronization between transmitter and receiver.

A cet effet, la serrure selon l'invention est caractérisée par le fait que le code varie en fonction du temps. To this end, the lock according to the invention is characterized in that the code varies over time.

Cette variation, commandée par une horloge, peut être aussi aléatoire qu'on le veut, afin d'augmenter la sécurité. This variation, controlled by a clock, can be as random as we want to increase safety.

De préférence, le récepteur et l'émetteur comprennent chacun un afficheur de temps avec remise à l'heure, le récepteur et l'émetteur comportant des moyens de modification respectivement du code conservé en mémoire et du code émis, les codes du récepteur et de l'émetteur étant identiques lorsque les temps affichés par chacun d'eux sont les mêmes. Preferably, the receiver and the transmitter each comprise a time display and release time, the receiver and transmitter having means for modifying each of the code stored in memory and transmitted code, the receiver codes and the transmitter being identical when the time displayed by each of them are the same.

Dans une forme de réalisation assurant une grande précision, les afficheurs de temps sont commandés par des oscillateurs à quartz ou des résonnateurs. In one embodiment providing highly accurate, time displays are controlled by crystal oscillators or resonators. De préférence, le circuit de commande comprend un microcalculateur, par exemple du type Preferably the control circuit comprises a microcomputer, for example of the type
CMOS. CMOS.

La sauvegarde de l'heure dans l'émetteur peut être assurée par un condensateur ou une mémoire non volatile. Saving time in the transmitter can be provided by a capacitor or a nonvolatile memory.

Pour l'émetteur, les défaillances ou débranchements de batterie pourront être assurés par un accumulateur électrique de faible capacité ou une mémoire non volatile. For the transmitter, malfunctions or battery disconnects may be operated by an electric accumulator of low capacity or a nonvolatile memory.

De préférence, le changement de code n'a pas lieu à heures fixes, mais selon une loi évitant le dépistage du système. Preferably, the code change does not take place at fixed times, but according to a law avoiding screening system.

Le message comprendra avantageusement un code indiquant l'heure, un code spécifique à chaque système, le code instantane et des bits de parité et de fin de message, le code spécifique déterminant l'évolution du code instantané en fonction du temps. The message advantageously comprise a code indicating the time, a code specific to each system, the instantaneous code and parity bits and end of message, the specific code determining the evolution of the instantaneous code in function of time.

De préférence, au moment du changement d'heure, le récepteur acceptera pendant un temps prédéterminé à la fois le code précédent et le nouveau code (pour palier à une légère désynchronisation des horloges). Preferably, at the time of the time change, the receiver will accept for a predetermined time at a time the previous code and the new code (to compensate for a slight desynchronization of clocks).

La programmation du code spécifique peut se faire par tous moyens connus, tels que liaisons sur circuit imprimé, coupures de pistes sur circuit imprimé, programmation d'une mémoire interne ou externe, roues codenses, etc. The programming specific code can be by any known means, such as connections PCB tracks outages PCB, programming an internal or external memory, codenses wheels, etc.

La programmation de l'heure peut se faire par afficheur analogique (figure 1), afficheur numérique (figure 2) ou par clavier (figure 3). The programming time can be done by analogue display (Figure 1), digital display (Figure 2) or keypad (Figure 3).

La figure 4 représente un schéma synoptique de la serrure électronique selon un exemple de réalisation de l'invention. 4 shows a block diagram of the electronic lock according to an exemplary embodiment of the invention.

L'émetteur 1 comprend un circuit de changement d'heure 2 et un circuit de changement de code spécifique 2' commandés par un calculateur 3 qui contrôle un afficheur de temps 4. The transmitter 1 includes a time shifting circuit 2 and a specific code changing circuit 2 'controlled by a computer 3 which controls a time display 4.

L'émetteur 1 comprend en outre un organe de transmission 5, par exemple par voie optique (infrarouge) ou radiofréquence, du contenu du calculateur 3. The transmitter 1 further comprises a transmission member 5, for example by optical means (infrared) or RF, the contents of the computer 3.

Le récepteur 6 comprend une section de réception des messages transmis par l'organe 5. Ces messages sont analysés dans un calculateur 7 qui commande une montre 8 pouvant servir de pendule de bord. The receiver 6 comprises a receiving section of the messages transmitted by the body 5. These messages are analyzed in a computer 7 that controls a clock 8 which can serve as clock edge. Le calculateur 7 reçoit par ailleurs un circuit de changement d'heure 9 et un circuit de changement de code spécifique 10. The computer 7 also receives a time changing circuit 9 and a specific code changing circuit 10.

Le signal de commande émis par le calculateur 7, en cas de concordance entre le message envoyé par l'organe de transmission 5 et le message qu'il contient, est envoyé à un interface de puissance 11 commandant alternativement le déverrouillage 12 et le verrouillage 13. The control signal issued by the computer 7, if a match between the message sent by the transmission member 5 and the message it contains, is supplied to a power interface 11 alternately commander unlocking the lock 12 and 13 .

Les calculateurs 3 et 7 peuvent être indifféremment soit des microprocesseurs, des circuits intégrés spécifiques, des circuits intégrés prediffusés ou des circuits précaractérisés. The computers 3 and 7 may equally be microprocessors, specific integrated circuits, integrated circuit gate arrays or standard cells circuits.

Claims (9)

    REVENDICATIONS
  1. 1.- Serrure électronique à code variable du type comprenant un émetteur (1) d'un message codé et un récepteur (6) dudit message formé de moyens (7) de lecture dudit message reçu, de comparaison dudit message reçu à un message contenu en mémoire et d'emission d'un signal de commande en cas de concordance entre lesdits messages, caractérisée par le fait que le code varie en fonction du temps. 1. Electronic lock-type variable code comprising a transmitter (1) an encoded message and a receiver (6) of said message formed means (7) for reading said received message, comparing said received message to a message content in memory and transmission of a control signal in case of agreement between said posts, characterized in that the code varies over time.
  2. 2.- Serrure électronique selon la revendication 1, caractérisee par le fait que le récepteur (6) et l'émetteur (1) comprennent chacun un afficheur de temps (8,4) avec remise à l'heure, le récepteur (6) et l'émetteur (1) comportant des moyens de modification respectivement du code conservé en mémoire et du code émis, les codes du récepteur (6) et de l'émetteur (1) étant identiques lorsque les temps affichés par chacun d'eux sont les mêmes. 2. An electronic lock according to claim 1, characterized in that the receiver (6) and the emitter (1) each comprise a time display (8.4) with reset the time, the receiver (6) and the transmitter (1) comprising changing means respectively the code stored in memory and transmitted code, the receiver codes (6) and transmitter (1) being identical when the time displayed by each of them are the same.
  3. 3.- Serrure électronique selon l'une des revendications 1 et 2, caractérisée par le fait que les afficheurs de temps (4,8) sont commandés par des oscillateurs à quartz ou des résonnateurs. 3. An electronic lock according to one of Claims 1 and 2, characterized in that the time display (4.8) are controlled by crystal oscillators or resonators.
  4. 4.- Serrure électronique selon la revendication 3, caractérisee par le fait que le circuit de commande comprend un calculateur, par exemple du type CMOS. 4. An electronic lock according to claim 3, characterized in that the control circuit comprises a computer, for example of CMOS type.
  5. 5.- Serrure électronique selon l'une des revendications 1 à 4, caractérisée par le fait que la sauvegarde de l'heure dans l'metteur (1) est assurée par un condensateur ou une mémoire non volatile. 5. An electronic lock according to one of Claims 1 to 4, characterized in that the backup time in the issuer (1) is provided by a capacitor or a nonvolatile memory.
  6. 6.- Serrure électronique selon l'une des revendications 1 à 5, caractérisée par le fait que les défaillances ou débranchements de batterie pour l'émetteur (1) sont assurés par un accumulateur électrique de faible capacité ou une mémoire non volatile. 6.- Electronic lock according to one of claims 1 to 5, characterized in that failures or battery disconnection of the transmitter (1) are provided by an electric accumulator of low capacity or a nonvolatile memory.
  7. 7.- Serrure électronique selon l'une des revendications 1 à 6, caractérisée par le fait que le changement de code n'a pas lieu à heures fixes, mais selon une loi évitant le dépistage du système. 7. An electronic lock according to one of claims 1 to 6, characterized in that the code change does not take place at fixed times, but according to a law avoiding screening system.
  8. 8.- Serrure électronique selon l'une des revendications 1 à 7, caractérisée par le fait que le message comprend un code indiquant l'heure, un code spécifique à chaque système, le code instantané et des bits de parité et de fin de message, le code spécifique déterminant l'évolution du code in instantané en fonction du temps. 8. An electronic lock according to one of Claims 1 to 7, characterized in that the message includes a code indicating the time, a code specific to each system, the instantaneous code and parity bits and end of message the determining specific code developments in flash code over time.
  9. 9.- Serrure électronique selon l'une des revendications 1 à 8, caractérisée par le fait qu'au moment du changement d'heure, le récepteur acceptera pendant un temps prédéterminé à la fois le code précédent et le nouveau code. 9. An electronic lock according to one of Claims 1 to 8, characterized in that at the time of the time change, the receiver will accept for a predetermined time at a time the previous code and the new code.
FR8616549A 1986-11-27 1986-11-27 Electronic lock with periodic code change Withdrawn FR2607544A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8616549A FR2607544A1 (en) 1986-11-27 1986-11-27 Electronic lock with periodic code change

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8616549A FR2607544A1 (en) 1986-11-27 1986-11-27 Electronic lock with periodic code change

Publications (1)

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FR2607544A1 true true FR2607544A1 (en) 1988-06-03

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FR8616549A Withdrawn FR2607544A1 (en) 1986-11-27 1986-11-27 Electronic lock with periodic code change

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311112A2 (en) * 1987-10-07 1989-04-12 Seiko Epson Corporation Remote control transmitting/receiving system
EP0372110A1 (en) * 1987-05-26 1990-06-13 Hai Cheng Chen A security system
FR2652216A1 (en) * 1989-09-20 1991-03-22 Rockwell Cim Method and device for generating and validating a numerical message and application of such a device.
WO1991006926A1 (en) * 1989-10-31 1991-05-16 Security Dynamics Technologies, Inc. Method and apparatus for secure identification and verification
EP0459781A1 (en) * 1990-05-29 1991-12-04 Microchip Technology Inc. Method and Apparatus for Use in an Access Control System
FR2678755A1 (en) * 1991-06-07 1993-01-08 Trw Sipea Spa Remote Control has enhanced security.
EP0577328A2 (en) * 1992-07-02 1994-01-05 AT&amp;T Corp. Secure toll collection system for moving vehicles
EP0698706A1 (en) * 1994-08-26 1996-02-28 TEMIC TELEFUNKEN microelectronic GmbH Method for operating a locking system for lockable objects
US6108326A (en) * 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same
US6154544A (en) 1995-05-17 2000-11-28 The Chamberlain Group, Inc. Rolling code security system
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
FR2823167A1 (en) * 2001-03-30 2002-10-11 Siemens Ag An apparatus for controlling a safety device
US6690796B1 (en) 1995-05-17 2004-02-10 The Chamberlain Group, Inc. Rolling code security system
WO2004057543A1 (en) * 2002-12-06 2004-07-08 Koninklijke Philips Electronics N.V. System and method for providing passenger security and convenience in a public transportation terminal
US6985583B1 (en) 1999-05-04 2006-01-10 Rsa Security Inc. System and method for authentication seed distribution
US7363494B2 (en) 2001-12-04 2008-04-22 Rsa Security Inc. Method and apparatus for performing enhanced time-based authentication
US8370638B2 (en) 2005-02-18 2013-02-05 Emc Corporation Derivative seeds
WO2013104962A1 (en) * 2012-01-12 2013-07-18 Sixs S.R.L. - Soluzioni Informatiche Per Il Sociale Method and system for certifying the presence of an operator

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0042886A1 (en) * 1980-07-01 1982-01-06 Iwasaki Engineering Co., Ltd. Electronic locking device
WO1985003785A1 (en) * 1984-02-22 1985-08-29 Gordian Systems, Inc. Solid state key for controlling access to computer software

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Publication number Priority date Publication date Assignee Title
EP0042886A1 (en) * 1980-07-01 1982-01-06 Iwasaki Engineering Co., Ltd. Electronic locking device
WO1985003785A1 (en) * 1984-02-22 1985-08-29 Gordian Systems, Inc. Solid state key for controlling access to computer software

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE 1976 INTERNATIONAL ZURICH SEMINAR ON DIGITAL COMMUNICATIONS, Interaction between circuit implementation and system design planning, operational and user aspects, 9-11 mars 1976, Zurich, Swiss Federal Institute of Technology, pages F6.1 - F6.5, IEEE, Long Beach, US; W.R.WIDMER: "Message authentication, a special identification requirement in one-way digital data transmission" *

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372110A1 (en) * 1987-05-26 1990-06-13 Hai Cheng Chen A security system
EP0311112A3 (en) * 1987-10-07 1989-11-23 Seiko Epson Corporation Remote control transmitting/receiving system
EP0311112A2 (en) * 1987-10-07 1989-04-12 Seiko Epson Corporation Remote control transmitting/receiving system
FR2652216A1 (en) * 1989-09-20 1991-03-22 Rockwell Cim Method and device for generating and validating a numerical message and application of such a device.
EP0419306A1 (en) * 1989-09-20 1991-03-27 ROCKWELL BODY AND CHASSIS SYSTEMS - FRANCE, en abrégé: ROCKWELL BCS - FRANCE Method and apparatus for generating and validating a numerical message and application of such an apparatus
WO1991006926A1 (en) * 1989-10-31 1991-05-16 Security Dynamics Technologies, Inc. Method and apparatus for secure identification and verification
US5517187A (en) * 1990-05-29 1996-05-14 Nanoteq (Pty) Limited Microchips and remote control devices comprising same
EP0459781A1 (en) * 1990-05-29 1991-12-04 Microchip Technology Inc. Method and Apparatus for Use in an Access Control System
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
FR2678755A1 (en) * 1991-06-07 1993-01-08 Trw Sipea Spa Remote Control has enhanced security.
EP0577328A3 (en) * 1992-07-02 1995-10-25 American Telephone & Telegraph Secure toll collection system for moving vehicles
EP0577328A2 (en) * 1992-07-02 1994-01-05 AT&amp;T Corp. Secure toll collection system for moving vehicles
EP0698706A1 (en) * 1994-08-26 1996-02-28 TEMIC TELEFUNKEN microelectronic GmbH Method for operating a locking system for lockable objects
US8284021B2 (en) 1995-05-17 2012-10-09 The Chamberlain Group, Inc. Rolling code security system
US6154544A (en) 1995-05-17 2000-11-28 The Chamberlain Group, Inc. Rolling code security system
US8233625B2 (en) 1995-05-17 2012-07-31 The Chamberlain Group, Inc. Rolling code security system
US6690796B1 (en) 1995-05-17 2004-02-10 The Chamberlain Group, Inc. Rolling code security system
US8194856B2 (en) 1995-05-17 2012-06-05 The Chamberlain Group, Inc. Rolling code security system
US8633797B2 (en) 1995-05-17 2014-01-21 The Chamberlain Group, Inc. Rolling code security system
US6985472B2 (en) 1997-05-08 2006-01-10 Microchip Technology Incorporated Method of communication using an encoder microchip and a decoder microchip
US6108326A (en) * 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same
US7502467B2 (en) 1999-05-04 2009-03-10 Rsa Security Inc. System and method for authentication seed distribution
US6985583B1 (en) 1999-05-04 2006-01-10 Rsa Security Inc. System and method for authentication seed distribution
FR2823167A1 (en) * 2001-03-30 2002-10-11 Siemens Ag An apparatus for controlling a safety device
US7363494B2 (en) 2001-12-04 2008-04-22 Rsa Security Inc. Method and apparatus for performing enhanced time-based authentication
WO2004057543A1 (en) * 2002-12-06 2004-07-08 Koninklijke Philips Electronics N.V. System and method for providing passenger security and convenience in a public transportation terminal
US8370638B2 (en) 2005-02-18 2013-02-05 Emc Corporation Derivative seeds
WO2013104962A1 (en) * 2012-01-12 2013-07-18 Sixs S.R.L. - Soluzioni Informatiche Per Il Sociale Method and system for certifying the presence of an operator

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