JP2004186851A - Remote controller and electronic apparatus provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote controller wherein a remote controller reception section accurately processes transmission information of a remote controller transmission section by performing encryption and decryption through time information of a wave clock used as a key, even when transmission mistakes and transmissions at the outside of a communication area are frequently made. <P>SOLUTION: When a user depresses a switch 1, a controller 4 respectively reads the time information from the wave clock 2 and ID data as key information corresponding to the switch 1 from an ID memory 3. The controller 4 encrypts the ID data by using the time information for a key and a transmitter 5 transmits encrypted ID data. When receiving the information wirelessly transmitted from the transmitter 5 of the remote controller transmission section 100, a receiver 11 reads time information from a wave clock 8 and decrypts the received information (encrypted information) by using the information for a key. When the decrypted resulting information is coincident with the ID data stored in an ID memory 9, the receiver 11 transmits a locking/unlocking signal to a lock apparatus 7. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a remote control device, and more particularly to a remote control device using time information as keys for encryption and decryption.
[0002]
[Prior art]
Conventionally, for example, in a keyless entry system or the like that unlocks a door using a remote control device, a transmission command (key information) from a remote control transmission unit has to be hidden from a third party. This is because if the information of the key transmitted from the transmission unit is passed to a third party, a problem occurs in security.
[0003]
In order to solve such a security problem, a technique for encrypting a transmission command (key information) from a remote control transmission unit and decrypting the transmission instruction (key information) in a remote control reception unit is described in Japanese Patent Application Laid-Open No. 2002-30838. ing. Hereinafter, the prior art described in Patent Document 1 will be briefly described.
[0004]
The transmission unit has a synchronization counter that is incremented by one each time a button on the key operation unit is pressed, and the reception unit has a synchronization counter that is incremented by one each time transmission data is received by operating the key operation unit. And checks encryption / decryption and transmission data based on the values of these synchronization counters. Specifically, the transmission data from the transmission unit is obtained by encrypting the user number, the encryption number set for each key, and the value of the synchronization counter with an encryption algorithm. Decrypt the data encryption code and inquire the encryption number. After that, the synchronization counter is checked. As a method of this check, if the count value of the transmission data matches the value of the synchronization counter on the receiving unit side or is within +16, the unlocking is performed. If not, the transmission value is within the range of the 32K window. The count value of the data is temporarily stored and unlocked, and if the count value of the next transmitted data matches the value of the synchronization counter of the receiving unit or is within +16, the count value of the receiving unit is stored. It is officially rewritten as In this way, unlocking is possible even if the count values on the sending side and receiving side are slightly different, even if the synchronization between the two synchronization counters is slightly lost due to a reception error or transmission outside the communication area. This is to make it possible.
[0005]
[Patent Document 1]
JP-A-2002-30838
[Problems to be solved by the invention]
However, in the above-mentioned case, when a reception error or transmission frequently occurs outside the communication area, the synchronization between the two synchronization counters is greatly broken, and the receiving unit cannot perform control according to the transmission data. Will happen.
[0007]
Further, if unlocking is possible even if the synchronization between the two synchronization counters is largely lost, the types of information that can be unlocked will increase accordingly, causing a problem in security.
[0008]
Such a problem is not limited to the keyless entry system, but is a problem common to remote control devices in which remote control transmission information is read and may be used illegally.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to enable a remote control receiver to accurately process transmission data of a remote control transmitter even if a transmission error or frequent transmission outside a communication area occurs in a remote control device using encrypted communication. It is.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, a transmitter-side clock unit for measuring time, an operation unit, and desired information corresponding to the operation unit are encrypted into desired encryption information using the clock time of the transmitter-side clock unit as a key. A remote controller transmitting unit including a transmitting unit that transmits the desired cryptographic information when the operation unit is operated, a receiving unit-side timing unit that counts time, and the desired cryptographic information. Receiving section, a decrypting section that decrypts the received desired cryptographic information using the clock time of the receiving section clock section as a key, and controls an external electronic device based on the decrypted desired information. And a remote control receiving unit including a control unit that generates a control output. According to such a configuration, since the remote control signal is encrypted and decrypted using the time as a key, the information transmitted from the remote control transmission unit is different each time, and even if this information is intercepted, the information is illegally used. Can be avoided.
[0011]
According to a second invention, in the first invention, the transmission unit-side clock unit and the reception unit-side clock unit are radio wave clocks that measure time based on the time information acquired from radio waves including time information. According to such a configuration, in addition to the above-described effects, it is possible to automatically synchronize the timing content of the transmitting unit timing unit and the timing content of the receiving unit timing unit. Can be eliminated.
[0012]
In a third aspect based on the second aspect, the remote control transmission section further includes an operation prohibition control section that prohibits the operation of the radio controlled watch on the remote control transmission section side in response to an operation of the operation section. According to such a configuration, in addition to the above effects, the transmission from the remote control transmission unit and the time information acquisition operation of the radio clock of the remote control transmission unit do not overlap, so that the peak value of the current consumption on the remote control transmission unit side is reduced. In addition, it is possible to prevent the transmission from the remote control transmission unit and the time information acquisition operation of the radio clock of the remote control transmission unit from interfering with each other, thereby making each operation unstable.
[0013]
In a fourth aspect based on the second or third aspect, the remote control transmission section includes an operation time storage section that stores a time when the operation section is operated, and an operation time stored in the operation time storage section. An operation time control unit that changes the operation time of the radio clock on the remote control transmission unit side in response thereto is further included. According to such a configuration, in addition to the above-described effects, the operation time of the radio clock of the remote control transmission unit can be changed to a time period during which the remote control transmission unit is difficult to operate. Therefore, it is possible to perform the time information acquisition operation of the radio clock of the remote control transmission unit while preventing the transmission from the remote control transmission unit and the time information acquisition operation of the radio clock of the remote control transmission unit from overlapping.
[0014]
In a fifth aspect based on any of the second to fourth aspects, the remote control receiver inhibits the operation of the radio clock on the remote control receiver side in accordance with the reception of the desired encryption information by the receiver. The configuration further includes an operation inhibition control unit. According to such a configuration, in addition to the above effects, the reception operation of the remote control receiving unit and the time information obtaining operation of the radio clock of the remote control receiving unit do not overlap, so that the peak value of the current consumption on the remote control receiving unit side is reduced. In addition, it is possible to prevent the receiving operation of the remote control receiving unit and the time information obtaining operation of the radio wave clock of the remote controlling receiving unit from interfering with each other to make each operation unstable.
[0015]
In a sixth aspect based on any one of the second to fifth aspects, the remote control receiving section includes a reception time storage section that stores a time at which the reception section receives the desired encryption information, and a reception time storage section that stores the reception time. And an operation time control unit that changes the operation time of the radio clock on the remote control reception unit side according to the reception time stored in the unit. According to such a configuration, it is possible to change the operation time of the radio clock of the remote control receiving unit to a time zone in which the remote control receiving unit does not easily receive transmission information from the remote control transmitting unit. Therefore, it is possible to cause the remote control receiver to perform the time information acquisition operation of the radio clock while the reception operation of the remote control receiver does not overlap the time information acquisition operation of the radio clock.
[0016]
A seventh invention is an electronic device including a remote control device including the remote control device and an electronic device controlled based on the control output. According to such a configuration, it is possible to achieve the above-described effects in the electronic device including the remote control device.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on an example shown in the drawings. In this example, as shown in FIG. 1, a keyless entry system having a wireless key for locking and unlocking with a radio signal will be described as an example of an electronic device having a remote control device. In addition, the electronic device including the remote control device is not limited to the keyless entry system, and can be appropriately changed. Further, the remote control device is not limited to the transmission / reception unit of the wireless key, and can be appropriately changed. In FIG. 1, reference numeral 100 denotes a remote control transmission unit, and 200 denotes a remote control reception unit.
[0018]
The remote control transmission unit 100 includes a switch 1 as an operation unit, a radio clock 2 as a transmission-side clock unit, a memory 3 for storing identification information as desired information (hereinafter, referred to as “ID data”), a CPU, a ROM, and a RAM. The control device 4 as an encryption unit, an operation prohibition control unit and an operation time setting unit, the transmitter 5 as a transmission unit including an antenna 5a, the operation start time of the radio clock 2 and the switch 1 are operated. A storage device 6 is provided as an operation time storage unit for storing time and the like. In this example, the ID data stored in the memory 3 is the key information corresponding to the switch 1 and a lock of the lock device 7 described later.
[0019]
The remote control receiving unit 200 outputs a control output (locking / unlocking signal) based on the information transmitted from the remote control transmitting unit 100 to the lock device 7 as an electronic device. 8, an ID memory 9 for storing the same ID data as the ID data stored in the ID memory 3 of the remote control transmission unit 100, a CPU, a ROM, a RAM, and the like, a decoding unit, a control unit, an operation prohibition control unit, and an operation time setting The control device 10 as a unit, the receiver 11 as a receiving unit provided with the antenna 11a, the operation start time of the radio clock 8 and the time at which the receiver 11 receives a wireless signal (encryption information) from the remote control transmitting unit 100 are stored. And a storage device 12 as a reception time storage unit.
[0020]
The radio timepieces 2 and 8 receive a long-wave standard radio wave (JJY) including time information and the like transmitted from a transmitting station in Fukushima or Kyushu, acquire time information from the received radio wave, and add the time information to the acquired time information. The time is measured based on the time.
[0021]
Next, the operation will be described. First, the operation of the remote control transmitting section 100 will be described.
[0022]
When the clock time of the radio clock 2 reaches the operation start time of the radio clock 2 stored in the storage device 6, the control device 4 outputs a reception start signal to the radio clock 2 and the radio clock 2 starts receiving JJY. The time information is acquired, and the time measured in the radio-controlled timepiece 2 is corrected based on the acquired time information. Therefore, the clock time of the radio clock 2 is synchronized with the JJY time information.
[0023]
When the user presses the switch 1, the control device 4 reads time information from the radio-controlled timepiece 2 and ID data as key information corresponding to the switch 1 from the ID memory 3. The control device 4 encrypts the ID data using the time information as a key, and the encrypted ID data is transmitted from the transmitter 5.
[0024]
When the switch 1 is pressed, the control device 4 stops the reception operation of the radio-controlled timepiece 2 for a predetermined time. Therefore, the transmission from the remote control transmission unit 100 and the time information acquisition operation of the radio clock 2 of the remote control transmission unit do not overlap, so that the peak value of the current consumption in the remote control transmission unit 100 can be suppressed. It is possible to prevent the transmission from 100 and the time information obtaining operation of the radio-controlled timepiece 2 of the remote control transmitting unit from interfering with each other, thereby making each operation unstable.
[0025]
Further, the control device 4 stores the time at which the switch 1 was pressed in the storage device 6, reads the time at which the switch 1 was pressed in the past from the storage device 6, and stores the time at which the switch 1 is pressed least frequently. The time when the JJY is received by the radio clock 2 is newly obtained based on the heading, and the operation start time of the radio clock 2 stored in the storage device 6 is rewritten to the newly obtained time. Therefore, the operation time of the radio-controlled timepiece 2 of the remote control transmission unit can be changed to a time zone in which the remote control transmission unit 100 is difficult to operate. Therefore, it is possible to perform the time information acquisition operation of the radio clock 2 of the remote control transmission unit while preventing the transmission from the remote control transmission unit 100 and the time information acquisition operation of the radio clock 2 of the remote control transmission unit from overlapping.
[0026]
Next, the operation of the remote control receiver 200 will be described.
[0027]
When the clock time of the radio clock 8 becomes the operation start time of the radio clock 8 stored in the storage device 12, the control device 10 outputs a reception start signal to the radio clock 8, and the radio clock 8 starts receiving JJY. The time information is acquired, and the time measured in the radio-controlled timepiece 8 is corrected based on the acquired time information. Therefore, the time measured by the radio clock 8 is synchronized with the time information of JJY. That is, the clock time of the radio clock 2 of the remote control transmission unit 100 and the clock time of the radio clock 8 of the remote control reception unit 200 are synchronized.
[0028]
When the receiver 11 receives the information wirelessly transmitted from the transmitter 5 of the remote control transmitting unit 100, the control device 10 reads the time information from the radio clock 8 and decrypts the received information (encryption information) using the time information as a key. When the information of the decryption result matches the ID data stored in the ID memory 9, a lock / unlock signal is sent to the lock device 7. When a locking / unlocking signal is input, the locking device 7 unlocks the door when it is locked and locks it when it is unlocked.
[0029]
As described above, since the remote control signal is encrypted and decrypted using the time as a key, the information transmitted from the remote control transmission unit 100 is different each time, and even if this information is intercepted, it is illegally used. Can be avoided.
[0030]
In addition, the transmission-side clock unit 2 and the reception-side clock unit 8 are radio wave clocks that measure the time based on time information acquired from radio waves including time information, so that the transmission unit-side clock unit and the reception clock unit can be used. Since it is possible to automatically synchronize the clocking contents of the external clocking unit, it is possible to eliminate the troublesome operation of the user to synchronize both clocking units.
[0031]
The control device 10 stops the reception operation of the radio-controlled timepiece 8 while the receiver 11 is receiving the information transmitted from the remote control transmission unit 100. Therefore, the receiving operation of the remote control receiving unit 200 and the time information obtaining operation of the radio wave clock 8 of the remote controlling receiving unit do not overlap with each other, so that the peak value of the current consumption in the remote controlling receiving unit 200 can be suppressed. It is possible to prevent the reception operation and the time information acquisition operation of the radio timepiece from interfering with each other and making each operation unstable.
[0032]
The control device 10 stores the time at which the receiver 11 received the correct ID data in the storage device 12, reads the time at which the ID data was received in the past from the storage device 12, and stores the time at which the ID data is received least frequently. Is found, and the time when the radio-controlled timepiece 8 receives JJY is newly obtained based thereon, and the operation start time of the radio-controlled timepiece 8 stored in the storage device 12 is rewritten to the newly obtained time. Therefore, the operation time of the radio-controlled timepiece 8 of the remote control receiving unit can be changed to a time zone in which the encrypted ID data is difficult to receive. Therefore, it is possible to perform the time information acquiring operation of the radio wave clock 8 of the remote control receiving unit while the receiving operation of the remote control receiving unit 200 and the time information acquiring operation of the radio clock 8 of the remote controlling receiving unit do not overlap.
[0033]
Note that a plurality of ID data stored in the ID memory 9 may be provided so as to be compatible with a plurality of remote control transmission units (keys) 100. That is, a remote control receiving unit that receives a plurality of keys may be used.
[0034]
In addition, the time at which the control device 10 of the remote control receiving unit 200 decrypts the encrypted information slightly deviates from the time at which the transmitting device encrypts (the radio wave for the control device 4 of the remote control transmitting unit 100 to encrypt). The time between the time when the time information is read from the clock 2 and the time when the control device 10 of the remote control receiving unit 200 reads the time information from the radio timepiece 8 for decryption). The time information of the clock 8 may be corrected. For example, the clock time of the radio-controlled timepiece 2 may be advanced from the time obtained from JJY by the above-described time delay, or the clock time of the radio-controlled timepiece 8 may be delayed from the time obtained from JJY by the above-described time delay. Further, decoding may be performed using a plurality of time data as keys.
[0035]
In the above description, time information is obtained from JJY as a radio clock. However, the present invention is not limited to this, and time information may be obtained from a GPS radio wave, and can be changed as appropriate.
[0036]
In the above description, the transmission-side clock unit and the reception-side clock unit are radio clocks. However, the transmission-side clock unit and the reception-side clock unit are not limited thereto. For example, a quartz clock with high timing accuracy may be used.
[0037]
In addition, the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist thereof.
[0038]
【The invention's effect】
According to the present invention, since the remote control signal is encrypted and decrypted using the time as a key, the information transmitted from the remote control transmission unit is different each time, and even if this information is intercepted, it is illegally used. Can be avoided. In addition, since the synchronization counter is not used as in the related art, the synchronization is not lost, and the probability that the information transmitted by the remote control receiving unit cannot be decoded can be reduced. Further, since time data is received while avoiding the time at which remote control transmission / reception is performed, failures in obtaining time information can be reduced, accurate time can be measured, and stable remote control transmission / reception can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Operation part 2 Transmission side clock part, radio timepiece 4 Encryption part, operation prohibition control part, operation time setting part 5 Transmission part 6 Operation time storage part 7 Electronic equipment 8 Receiving side clock part, radio timepiece 10 Decoding part, control part , Operation prohibition control unit, operation time setting unit 12 reception time storage unit 100 remote control transmission unit 200 remote control reception units 100, 200 remote control device

Claims (7)

A transmitting-side clock unit for measuring time, an operating unit, an encrypting unit for encrypting desired information corresponding to the operating unit into desired cryptographic information using the clocking time of the transmitting-side clock unit as a key, and the operation A remote control transmission unit including a transmission unit that transmits the desired encryption information when the unit is operated,
A receiving-side clock unit that counts time, a receiving unit that receives the desired cryptographic information, and a decryption unit that decrypts the desired cryptographic information received by the receiving unit using the clocking time of the receiving-side clock unit as a key A remote control receiving unit comprising: a control unit that generates a control output for controlling an external electronic device based on the desired information decoded by the decoding unit. 2. The remote control device according to claim 1, wherein the transmission-side clock unit and the reception-side clock unit are radio clocks that measure time based on the time information acquired from a radio wave including time information. 3. The remote control device according to claim 2, wherein the remote control transmission unit further includes an operation prohibition control unit that prohibits the operation of the radio clock on the remote control transmission unit side in response to an operation of the operation unit. 4. The remote control transmission unit according to claim 2, wherein the remote control transmission unit stores an operation time storage unit that stores a time at which the operation unit is operated, and the remote control transmission unit side according to the operation time stored in the operation time storage unit. A remote control device, further comprising: an operation time setting unit that sets an operation time of the radio clock. 5. The remote control receiver according to claim 2, further comprising an operation prohibition control unit that prohibits the operation of the radio clock on the remote control receiver side when the desired encryption information is received by the receiver. A remote control device characterized by the above-mentioned. 6. The remote control receiving unit according to claim 2, wherein the remote control receiving unit stores a time at which the receiving unit receives the desired encryption information, and a reception time stored in the reception time storing unit. An operation time setting section for setting an operation time of the radio clock on the remote control receiving section side in response thereto. An electronic device comprising a remote control device according to any one of claims 1 to 6, and an electronic device controlled based on the control output.

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