GB2265482A - Security system data transmission - Google Patents
Security system data transmission Download PDFInfo
- Publication number
- GB2265482A GB2265482A GB9206851A GB9206851A GB2265482A GB 2265482 A GB2265482 A GB 2265482A GB 9206851 A GB9206851 A GB 9206851A GB 9206851 A GB9206851 A GB 9206851A GB 2265482 A GB2265482 A GB 2265482A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parameter
- code
- reproduced
- arrangement according
- preselected
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims description 11
- 238000012790 confirmation Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
- B60R25/1003—Alarm systems characterised by arm or disarm features
-
- 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
- G07C2009/00793—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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Burglar Alarm Systems (AREA)
- Selective Calling Equipment (AREA)
Abstract
A motor vehicle alarm system has a radio transmitter convenient for carrying by the driver of the vehicle, and a radio receiver suitably located inside the vehicle. The transmitter can be operated remotely to transmit a numerical rolling or dynamic code whereby a different code is transmitted each time. Such a code is determined by the use of a preselected security number and a randomly selected step number, the latter being altered in each transmission. The transmitter uses the security and step numbers in an algorithm, and the receiver, provided with the security number, can use the latter and the code in a reverse algorithm in order to reproduce the step number. Comparison with a previously stored step number is then made by the receiver to prevent a response to an unauthorised transmission.
Description
Improvements in Data Transmission
This invention relates to an arrangement for and method of transmitting data, particularly but not exclusively concerned with the secure transmission of numerical codes, for example for remote control of a motor vehicle burglar alarm system.
When transmitting data, it is sometimes necessary for security reasons for the transmitter to send a special code, such that the receiver will only accept the data if the receiver also gets the correct code. Such a code can be static, i.e. a fixed code. A weakness of this, particularly if it is possible for an unauthorised third party to tap into the transmission medium, is that the third party can listen to the transmitted code, and then re-transmit the code to access the receiver. This is a particular problem with radio systems. A rolling or dynamic code system can alternatively be used, whereby a different code is sent each time. However, present rolling or dynamic code systems have not proved sufficiently successful in preventing an unauthorised third party from identifying acceptable codes and thereby gaining access to the receiver.
Reference is made hereinafter to the code transmission by way of "wave energy". The term is to be costrud as as embracing transmissiorl by way of any of radio waves, infrared waves, u]lrasonics r a so t01 c 5 a t d 0 uther Sike k e e r0 e r g y.
According to the present invention there is provided a data transmission arrangement comprising means for transmitting a code by way of wave energy, the transmitting means being provided with means for storing a preselected first parameter, means for generating a second parameter, and means for producing the code for transmission from the first and second parameters, and receiving means, the latter being provided with means for storing the preselected first parameter, means for receiving the code transmitted by the transmitting means, means for reproducing the second parameter from the code and the first parameter, means for comparing the reproduced second parameter with at least one parameter previously reproduced and accepted, and means for accepting the second parameter and thereby responding to the transmitted code only after the reproduced second parameter is confirmed to have a predetermined relation to said at least one previously reproduced parameter.
Preferably the transmitting means is adapted to transmit a numerical code and each of the first and second parameters is a number. The preselected first number is preferably randomly preselected.
Preferably also the parameter with which the second number is compared is a previously reproduced second number which was accepted by the receiving means after comparison, means being provided for storing the previously accepted second number for subsequent comparison purposes. The comparison means includes means for checking that the reproduced second number is greater than the stored second number, and preferably also includes means for checking that the reproduced second number is not greater than the stored second number by a preselected amount.
The second number generating means may be adapted to increment the second number, for example by one, each time a code is transmitted. Also the second number gen erating means may be initially provided with a randomly selected second number, and means may be provided in each of the transmitting means and the receiving means to store this initial randomly selected second number.
The transmitting means may be provided with means for storing a further preselected number which is required to be used by the code producing means, the receiving means being provided with means for storing the further preselected number which is required to be used by the means reproducing the second number.
Further, the transmitting means may be adapted to randomly generate the second preselected number and may also be adapted to alter the further number and transmit same, the receiving means being adapted to receive the transmitted second number and store same.
The present invention also provides a method of transmitting data by way of wave energy, comprising the steps of producing a code for transmission from transmitting means by utilising a preselected first parameter and a second parameter generated by the transmitting means, transmitting the produced code, receiving the transmitted code in transmitting means and therein reproducing the second parameter from the code and the preselected first parameter available to the receiving means, comparing the reproduced second parameter with at least one parameter previously reproduced and accepted by the receiving means, and enabling the receiving means to accept the second parameter and thereby respond to the transmitted code, only after confirmation that the reproduced second parameter has a predetermined relation to said at least one previously reproduced parameter.
Preferably the method comprises transmission of a numerical code, and the code may be transmitted in the form of a radio signal.
Preferably also the comparison includes checking that the reproduced second parameter is greater than the stored second parameter, and further may irlcludr checking that the reproduced second parameter Is not grater than the stored second parameter by a preselected amount.
An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawing which is a diagrammatic representation of the operation of a data transmission arrangement according to the invention.
A motor vehicle burglar alarm system has a radio transmitter in the form of a relatively small device convenient for carrying by the driver of the vehicle, for example on a keyring, and a radio receiver suitably located inside the vehicle. Appropriate operation of a switch on the transmitter transmits a radio signal in the form of a code which can be detected by the receiver, with the result that the latter arms an alarm system within the vehicle. The latter may comprise sensors which can detect when there is unauthorised entry to the vehicle, at which time any suitable warning system, for example a siren, can be activated. Subsequent operation of the same switch on the transmitter can then disarm the alarm system.
The alarm system is designed to utilise a rolling or dynamic code system, whereby a different code is transmitted each time by the transmitter. The transmitter utilises suitable electrical circuitry to enable storing of a preselected first or 'security' number, and also to store initially a second or 'step' number. The security number is initially randomly chosen, and the receiver is also adapted to store the same security number. The initial step number is also randomly chosen and again the receiver is adapted to store the same number. In order to produce a required numerical code for transmission, the transmitter uses the security and step numbers in an algorithm. Each time a code is transmitted, the transmitter increments a counter therein by one, in order to generate a new step number for use in the next transmission.
When the transmitted code is received by the receiver, the latter uses the security number and the code in an algorithm, which is the reverse of the transmitter algorithm, in order to reproduce the step number. The reproduced step number is then compared with a previously stored step number to ensure that the reproduced step number is greater than the stored step number, and also checks that the reproduced step number is not greater than the stored step number by a certain amount.
The former checking ensures that no previously sent code is accepted by the receiver. The latter checking produces a band of acceptable codes. The greater this band, the more times the transmitter can send codes when the receiver is not listening. It will be appreciated that, after accepting an initial code, the receiver will each time store the most recently accepted step number which will be used for comparison with the step number reproduced from the next code which is transmitted and received.
It may be preferred to utilise a secondary security number in order to avoid the requirement of a large range of security numbers. Such a secondary security number need not be a fixed number but would have to be stored, when appropriate, by both the transmitter and the receiver. The secondary security number would be utilised in producing the code to be transmitted, and could be a number randomly generated by the transmitter and sent to the receiver. With this arrangement, the secondary security number could be changed regularly.
Alternatively the secondary security number could be chosen to be the initial step number.
In the case of a system where the receiver is not always listening to the transmitter, such that a number of codes could be sent without being accepted, the receiver should be able to accept the next code that is sent after it has started to listen again. In the radio system, for example, the transmitter may sometimes be operated out of range.
In the drawing, the first security number is identified as 'Sec. No.', the initial step number is identified by D, and the secondary security number (which is not in this case the same as the initial step number) is identified as '2nd'y Sec. No.' The diagrammatic representation shows the step number increasing in increments of one. The band of acceptable codes is identified by
B, and the representation shows that the transmitter can send B-1 codes with the receiver not listening, and still be aligned when the next code is received.
In normal operation, pressing of the transmitter switch sends the next code in the rolling code sequence.
This is received and decoded by the receiver in the vehicle, and if in the acceptable band of codes, the code is acted upon by the receiver.
The security number, the initial step number, and the secondary security number could be stored in the transmitter and receiver by any of a variety of methods.
For example, the numbers could be physically embedded by way of links or drilled holes in a printed circuit board, or the numbers could be held in non-volatile memory circuitry. It may be possible to set up the transmitter and receiver with the numbers separately.
However, it may be desirable in certain situations for the transmitter to send information relating to these numbers to the receiver in a special "start up signal".
If required, the receiver could be arranged to only accept this information when the receiver is in a special learn mode. Alternatively, the receiver could be arranged to only accept a new security number in the learn mode, but to accept a new secondary security number at any time.
The number of transmitter - receiver pairs having the same security number should be kept to a minimum, thus minimising the chances of a transmitter accessing the wrong receiver.
The arrangement described above obviates or mitigates the likelihood of an unauthorised third party finding a code which is acceptable to the receiver by listening to a transmitted code, and therefore provides increased transmission security.
The greater the number of step numbers, the greater the number of different codes, and thus the more difficult it is for a third party to find an acceptable code. If the step numbers were to start at zero then a third party might know not to bother with higher step numbers, on the basis that the amount of codes ever likely to be sent is much less than the total available.
For this reason, the initial step number is randomly chosen as referred to above within the step number range. For the same reasons, the security number is randomly chosen. An optional check can be carried out to avoid repeating numbers.
Where a third party is able to listen to several consecutive codes, then attempts to compute the next code using a trial and error method, whereby different security numbers are tried until the captured sequence of codes can be recreated, then the time taken to find the correct security number will obviously be longer the greater the range of security numbers. However, it may not be desirable to have a large amount of security numbers for various reasons, for example where the security number is established by hardware switches, a large number of switches would be expensive, and where the security number may need to be written and quoted, too larger a number might be cumbersome. For this reason, the secondary security number can be used.
Another problem which can occur involves a third party transmitting a stream of different codes in order to happen upon a correct one. For this reason, the time for a code stream generator to find an acceptable code should be very long. This time can be increased by reducing the rate at which the receiver will listen to codes, for example by having a minimum time from reception of one code before listening for another.
Various modifications may be made without departing from the invention. For example, the code may be transmitted by infrared, ultrasonics, or any other suitable form of wave energy. Also different switches for arming, disarming and other formations could be used on the transmitter.
Whilst endeavouring in the foregoing Specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and,'or shown in the drawings whether or not particular emphasis has been placed thereon.
Claims (23)
1. A data transmission arrangement comprising means for transmitting a code by way of wave energy, the transmitting means being provided with means for storing a preselected first parameter, means for generating a second parameter, and means for producing the code for transmission from the first and second parameters, and receiving means, the latter being provided with means for storing the preselected first parameter, means for receiving the code transmitted by the transmitting means, means for reproducing the second parameter from the code and the first parameter, means for comparing the reproduced second parameter with at least one parameter previously reproduced and accepted, and means for accepting the second parameter and thereby responding to the transmitted code only after the reproduced second parameter is confirmed to have a predetermined relation to said at least one previously reproduced parameter.
2. An arrangement according to Claim 1, wherein the preselected first parameter is randomly preselected.
3. An arrangement according to Claim 1 or 2, wherein the transmitting means is adapted to transmit a numerical code and each of the first and second parameters is a number.
4. An arrangement according to Claim 3, wherein the parameter with which the second number is compared is a previously reproduced second number which was accepted by the receiving means after comparison, means being provided for storing the previously accepted second number for subsequent comparison purposes.
5. An arrangement according to Claim 4, wherein the comparison means includes means for checking that the reproduced second number is greater than the stored second number.
6. An arrangement according to Claim 4 or 5, wherein the comparison means includes means for checking that the reproduced second number is not greater than the stored second number by a preselected amount.
7. An arrangement according to any of Claims 3 to 6, wherein the second number generating means is adapted to increment the second number each time a code is transmitted.
a. An arrangement according to Claim 7, wherein the second number generating means is adapted to increment the second number by one.
9. An arrangement according to any of Claims 3 to 8, wherein the second number generating means is initially provided with a randomly selected second number.
10. An arrangement according to Claim 9, wherein means is provided in each of the transmitting means and the receiving means to store the initial randomly selected second number.
11. An arrangement according to any of Claims 3 to 10, wherein the transmitting means is provided with means for storing a further preselected number which is required to be used by the code producing means, the receiving means being provided with means for storing the further preselected number which is required to be used by the means reproducing the second number.
12. An arrangement according to Claim 11, wherein the transmitting means is adapted to randomly generate the further preselected number.
13. An arrangement according to Claim 12, wherein the transmitting means is adapted to alter the further number and transmit same.
14. An arrangement according to Claim 12 or 13, wherein the receiving means is adapted to receive the transmitted further number and store same.
15. A motor vehicle alarm system comprising a data transmission arrangement according to any of the preceding Claims.
16. A method of transmitting data by way of wave energy, comprising the steps of producing a code for transmission from transmitting means by utilising a preselected first parameter and a second parameter generated by the transmitting means, transmitting the produced code, receiving the transmitted code in transmitting means and therein reproducing the second parameter from the code and the preselected first parameter available to the receiving means, comparing the reproduced second parameter with at least one parameter previously reproduced and accepted by the receiving means, and enabling the receiving means to accept the second parameter and thereby respond to the transmitted code, only after confirmation that the reproduced second parameter has a predetermined relation to said at least one previously reproduced parameter.
17. A method according to Claim 16, wherein transmission is by way of a numerical code.
18. A method according to Claim 16 or 17, wherein the code is transmitted in the form of a radio signal.
19. A method according to any of Claims 16 to 18, wherein the comparison includes checking that the reproduced second parameter is greater than the stored second parameter.
20. A method according to Claim 18, wherein the comparison includes checking that the reproduced second parameter is not greater than the stored second parameter by a preselected amount.
21. A data transmission arrangement substantially as hereinbefore described with reference to the accompanying drawings.
22. A method of transmitting data substantially as hereinbefore described with reference to the accompanying drawings.
23. Any novel subject matter or combination including novel subject matter disclosed, whether or not within the scope of or relating to the same invention as any of the preceding Claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9206851A GB2265482B (en) | 1992-03-28 | 1992-03-28 | Improvements in data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9206851A GB2265482B (en) | 1992-03-28 | 1992-03-28 | Improvements in data transmission |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9206851D0 GB9206851D0 (en) | 1992-05-13 |
| GB2265482A true GB2265482A (en) | 1993-09-29 |
| GB2265482B GB2265482B (en) | 1995-07-26 |
Family
ID=10713070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9206851A Expired - Lifetime GB2265482B (en) | 1992-03-28 | 1992-03-28 | Improvements in data transmission |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2265482B (en) |
Cited By (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994018036A1 (en) * | 1993-02-12 | 1994-08-18 | Robert Bosch Gmbh | Remote-controlled protection system for a motor vehicle |
| WO1995009746A1 (en) * | 1993-10-01 | 1995-04-13 | Marquardt Gmbh | Locking system, in particular for motor vehicles |
| WO1995009747A3 (en) * | 1993-10-01 | 1995-06-29 | Marquardt Gmbh | Electronic door locking system for motor vehicles |
| FR2719962A1 (en) * | 1994-05-11 | 1995-11-17 | Siemens Ag | Electronic security device and method for its operation |
| EP0697491A1 (en) * | 1994-08-05 | 1996-02-21 | Nippondenso Co., Ltd. | Remote control system and method using variable ID code |
| US5661804A (en) * | 1995-06-27 | 1997-08-26 | Prince Corporation | Trainable transceiver capable of learning variable codes |
| WO1998039702A1 (en) * | 1997-02-19 | 1998-09-11 | Mobiltrading & Financing Anstalt | Contactless log-on system for computers |
| WO2001034439A1 (en) * | 1999-11-11 | 2001-05-17 | Edge-Tek Co. | An engine ignition control unit for motorcycles having an immobilizer function |
| EP0771498A4 (en) * | 1995-05-17 | 2001-09-12 | Chamberlain Group Inc | Rolling code security system |
| US7269416B2 (en) | 2003-07-30 | 2007-09-11 | Lear Corporation | Universal vehicle based garage door opener control system and method |
| US7412056B2 (en) | 1995-05-17 | 2008-08-12 | The Chamberlain Group, Inc. | Rolling code security system |
| US7447498B2 (en) | 2003-07-30 | 2008-11-04 | Lear Corporation | User-assisted programmable appliance control |
| US7492905B2 (en) | 1995-05-17 | 2009-02-17 | The Chamberlain Group, Inc. | Rolling code security system |
| US7492898B2 (en) | 1995-05-17 | 2009-02-17 | The Chamberlain Group, Inc. | Rolling code security system |
| US7589613B2 (en) | 2006-04-03 | 2009-09-15 | Lear Corporation | Trinary to trinary rolling code generation method and system |
| US7760071B2 (en) | 2003-07-30 | 2010-07-20 | Lear Corporation | Appliance remote control having separated user control and transmitter modules remotely located from and directly connected to one another |
| US7812739B2 (en) | 2003-07-30 | 2010-10-12 | Lear Corporation | Programmable appliance remote control |
| US7855633B2 (en) | 2003-07-30 | 2010-12-21 | Lear Corporation | Remote control automatic appliance activation |
| WO2015144508A1 (en) * | 2014-03-27 | 2015-10-01 | Friedrich Kisters | Security method |
| WO2015144511A1 (en) * | 2014-03-27 | 2015-10-01 | Friedrich Kisters | Authentication system |
| CN106462739A (en) * | 2014-03-27 | 2017-02-22 | F·吉斯特斯 | Authentication method and authentication system |
| DE102015116627A1 (en) | 2015-09-30 | 2017-03-30 | Friedrich Kisters | Method and device for authenticating an object or a person via a modularly constructed security element |
| US10652743B2 (en) | 2017-12-21 | 2020-05-12 | The Chamberlain Group, Inc. | Security system for a moveable barrier operator |
| US10720003B2 (en) | 2014-06-04 | 2020-07-21 | Friedrich Kisters | Security device and authentication method with dynamic security features |
| 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 |
| US12149618B2 (en) | 2005-01-27 | 2024-11-19 | The Chamberlain Group Llc | Method and apparatus to facilitate transmission of an encrypted rolling code |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2254461A (en) * | 1991-02-15 | 1992-10-07 | Alps Electric Co Ltd | Identification information transmitter/receiver system |
| GB2257552A (en) * | 1991-06-07 | 1993-01-13 | Trw Sipea Spa | Extra-safe remote control. |
-
1992
- 1992-03-28 GB GB9206851A patent/GB2265482B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2254461A (en) * | 1991-02-15 | 1992-10-07 | Alps Electric Co Ltd | Identification information transmitter/receiver system |
| GB2257552A (en) * | 1991-06-07 | 1993-01-13 | Trw Sipea Spa | Extra-safe remote control. |
Cited By (51)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994018036A1 (en) * | 1993-02-12 | 1994-08-18 | Robert Bosch Gmbh | Remote-controlled protection system for a motor vehicle |
| US5841363A (en) * | 1993-10-01 | 1998-11-24 | Marquardt Gmbh | Locking system especially for automobiles |
| WO1995009746A1 (en) * | 1993-10-01 | 1995-04-13 | Marquardt Gmbh | Locking system, in particular for motor vehicles |
| WO1995009747A3 (en) * | 1993-10-01 | 1995-06-29 | Marquardt Gmbh | Electronic door locking system for motor vehicles |
| FR2719962A1 (en) * | 1994-05-11 | 1995-11-17 | Siemens Ag | Electronic security device and method for its operation |
| EP0697491A1 (en) * | 1994-08-05 | 1996-02-21 | Nippondenso Co., Ltd. | Remote control system and method using variable ID code |
| US5774065A (en) * | 1994-08-05 | 1998-06-30 | Nippondenso Co., Ltd. | Remote control system and method using variable ID code |
| US7492905B2 (en) | 1995-05-17 | 2009-02-17 | The Chamberlain Group, Inc. | Rolling code security system |
| EP0771498A4 (en) * | 1995-05-17 | 2001-09-12 | Chamberlain Group Inc | Rolling code security system |
| US7492898B2 (en) | 1995-05-17 | 2009-02-17 | The Chamberlain Group, Inc. | Rolling code security system |
| US7412056B2 (en) | 1995-05-17 | 2008-08-12 | The Chamberlain Group, Inc. | Rolling code security system |
| US5661804A (en) * | 1995-06-27 | 1997-08-26 | Prince Corporation | Trainable transceiver capable of learning variable codes |
| WO1998039702A1 (en) * | 1997-02-19 | 1998-09-11 | Mobiltrading & Financing Anstalt | Contactless log-on system for computers |
| WO2001034439A1 (en) * | 1999-11-11 | 2001-05-17 | Edge-Tek Co. | An engine ignition control unit for motorcycles having an immobilizer function |
| US7489922B2 (en) | 2003-07-30 | 2009-02-10 | Lear Corporation | User-assisted programmable appliance control |
| US7447498B2 (en) | 2003-07-30 | 2008-11-04 | Lear Corporation | User-assisted programmable appliance control |
| US7269416B2 (en) | 2003-07-30 | 2007-09-11 | Lear Corporation | Universal vehicle based garage door opener control system and method |
| US7760071B2 (en) | 2003-07-30 | 2010-07-20 | Lear Corporation | Appliance remote control having separated user control and transmitter modules remotely located from and directly connected to one another |
| US7812739B2 (en) | 2003-07-30 | 2010-10-12 | Lear Corporation | Programmable appliance remote control |
| US7855633B2 (en) | 2003-07-30 | 2010-12-21 | Lear Corporation | Remote control automatic appliance activation |
| US12149618B2 (en) | 2005-01-27 | 2024-11-19 | The Chamberlain Group Llc | Method and apparatus to facilitate transmission of an encrypted rolling code |
| US11799648B2 (en) | 2005-01-27 | 2023-10-24 | The Chamberlain Group Llc | Method and apparatus to facilitate transmission of an encrypted rolling code |
| US10944559B2 (en) | 2005-01-27 | 2021-03-09 | The Chamberlain Group, Inc. | Transmission of data including conversion of ternary data to binary data |
| 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 |
| US7589613B2 (en) | 2006-04-03 | 2009-09-15 | Lear Corporation | Trinary to trinary rolling code generation method and system |
| CN106415609A (en) * | 2014-03-27 | 2017-02-15 | F·吉斯特斯 | Authentication system |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB9206851D0 (en) | 1992-05-13 |
| GB2265482B (en) | 1995-07-26 |
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| Date | Code | Title | Description |
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| PE20 | Patent expired after termination of 20 years |
Expiry date: 20120327 |