JP2597044B2 - IC card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to an IC card capable of remotely controlling an external device.

[Prior art]

The IC card is a card having a built-in memory and a semiconductor functional element such as a CPU (Central Processing Unit) and a power supply, and performs, for example, individual collation based on information stored in the memory. The IC card has a feature that it has a high security function and is excellent in portability because it is easy to protect the internal information from being stolen or intentionally changed. Furthermore, the IC card having the above-mentioned features is provided with a wireless communication function, and a signal of the IC card or the like is transmitted by simply bringing the IC card close to an external device, for example, entry / exit management (door open / close determination for a person who wants to enter / exit). There are IC cards that can be controlled remotely, such as unlocking and locking. Conventionally, there is an IC card as described above as shown in FIG. FIG. 4 is a block diagram of an IC card having a wireless communication function, wherein 1 is an IC card main body, 2 is a memory, 3 is a CPU, 4 is a wireless transmitting / receiving section, and 5 is an antenna. The memory 2 and the wireless transmission / reception unit 4 operate under the control of the CPU 3 to remotely control an external device. The power battery 6 supplies power to each functional element. FIG. 5 is a schematic configuration diagram of an entry / exit management system using the IC card of FIG. The controller 11 that unlocks the electric lock or the like at the door gate 15 constantly transmits the radio wave 12. This radio wave 12 is weak and extends only to a region 13 at a certain distance. Now, when the person carrying the IC card 10 enters the area 13, the antenna 5 of the IC card 10 receives the radio wave 12. Then, the IC card 10 detects from the content of the radio wave 12 that the controller 11 is a controller for unlocking the target door gate 15 and issues a radio wave indicating the door opening.
Send 14. When the controller 11 receives the indicating radio wave 14, the controller 11
Unlocking is done.

[Problems to be solved by the invention]

However, the IC with the above-mentioned conventional wireless communication function
In the card 10, the door opening instruction radio wave 14 transmitted by the IC card 10 is received by another transceiver, and the transceiver transmits the same radio wave as the instruction radio wave 14,
There is a security problem peculiar to an IC card for remote control, in which the door gate 15 can be unlocked without using the IC card 10. The same problem as described above also occurs in an IC card in which the remote control is performed using a light emitting element. Therefore, an object of the present invention is to provide an IC card that can make it very difficult to perform remote control with another transceiver and that can improve security.

[Means for Solving the Problems]

To achieve the above object, the IC card of the present invention has a built-in semiconductor functional element constituting a memory and a control unit, a transmission / reception unit, and a power supply, and receives a reception signal from an external device via the transmission / reception unit. The control unit reads out a transmission signal corresponding to the reception signal from a memory, transmits the transmission signal from the transmission / reception unit to the external device, and remotely controls locking and unlocking of a door of the external device by an IC card. A door open switch for transmitting a door open signal from the transmitting / receiving unit to the external device; and a door closing switch for transmitting a door closing signal from the transmitting / receiving unit to the external device. Receiving a door open signal or a door close signal, a plurality of identification codes corresponding one-to-one to a plurality of random number codes randomly transmitted from the external device. The control unit reads the identification code corresponding to the random number code one-to-one from the memory when the random number code is received by the transmission / reception unit, and reads out the external code from the transmission / reception unit. It is characterized by being transmitted to a device.

[Action]

The external device transmits a plurality of random number codes at random. Then, the control unit reads the identification code corresponding to the random number code received from the external device via the transmission / reception unit from the memory, and transmits the identification code from the transmission / reception unit to the external device. Remote control. Therefore, once another transceiver receives an identification code that is a signal for remotely controlling the external device, and then uses the same identification code as the identification code to connect the external device with the another transceiver. Even if remote control is to be performed, at this time, the probability that the identification code from the another transceiver corresponds to the random number code transmitted randomly by the external device becomes very small. Therefore, it is very difficult to remotely control the external device with the another transceiver, and security is improved. In addition, since a plurality of identification codes corresponding to a plurality of random number codes are stored in the memory in advance, the control unit calls the identification codes corresponding to the random number codes from the external device one-to-one from the memory, and directly calls the identification codes. It can be sent to external devices, and signal processing can be done easily and quickly. Further, even if the user is away from the door, the door can be unlocked or locked by remote control by turning on the door open switch or the door close switch of the IC card carried. In addition, since the door close switch for locking the door and the door open switch for unlocking the door are separate, it is possible to prevent a user from giving a lock instruction and an unlock instruction by mistake.

【Example】

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a block diagram of an IC card according to one embodiment of the present invention. In FIG. 1, 21 is an IC card body, 22 is a CP.
This is a memory for storing U23 programs and ID codes such as personal identification numbers. Light receiving element 25 composed of phototransistor etc.
Is conductive when light is received, and is non-conductive when light is not received. The light receiving element 25 and the resistor 26 are connected in series, and the light receiving element 25 is connected to the battery 24, while the resistor 26 is grounded. When the light receiving element 25 receives the light, the resistance value becomes substantially “0” and the light receiving element 25 becomes conductive, and the voltage level of the input terminal of the receiver 27 becomes the power supply voltage “H” by the resistance 26. On the other hand, when no light is received, the resistance value becomes infinite and becomes non-conductive, and the voltage level of the input terminal of the receiver 27 becomes “L” due to the ground voltage. The change in the voltage level when there is light reception and when there is no light reception is transmitted from the CPU 23 via the receiver 27. And
Due to the change of “H” / “L” of this voltage level,
None is identified. The light emitting element 28 is constituted by, for example, a light emitting diode or the like, and emits light when driven by a driver 29 operated under the control of the CPU 23. The CPU 23 performs transmission of information stored in the memory 22, remote control of external devices, and the like. The door open switch 30 is a switch for unlocking the door gate 35 and issuing an instruction to automatically open the door. Also, the door close switch 31
Is a switch for issuing an instruction to automatically close the door and lock the door gate 35 (see FIG. 2). FIG. 2 is a configuration diagram of an entry / exit management system using the above-mentioned IC card. When the person 33 carrying the IC card 34 presses the door open switch 30 with respect to the controller 32 that unlocks the door gate 35, the driver 29 is operated under the control of the CPU 23 to drive the light emitting element 28, An optical signal 4a for instructing door opening is transmitted. Then, the controller 32 receives the optical signal 4a for instructing the door to open, and generates a random code.
4b is returned to the IC card 34. The IC card 34 that has received the random code 4b transmits the ID code stored in the memory 22 that is the identification code corresponding to the code 4b to the controller 32 as an optical signal 4c. And the controller
When the controller 32 receives the optical signal 4c indicating the ID code and the controller 32 determines that the ID code corresponds to the code 4b, the door gate 35 is unlocked and the door is automatically opened. . Therefore, once the identification code is received by another transceiver and then the controller 32 is controlled by using the same identification code as the identification code. The probability that the identification code corresponds to the code 4b randomly transmitted by the controller 32 is very small. Therefore, it is very difficult to remotely control the controller 32 with the other transceiver, and an entry / exit management system excellent in crime prevention can be realized. Next, the above operation is performed by the IC card 34 shown in FIG.
A description will be given based on flowcharts representing programs of the CPU 32 and the controller 32. First, in step S1, the IC card 34 determines whether or not the door open switch 30 has been pressed.
If it is determined that 30 has been pressed, the process proceeds to step S2.
If it is determined that the door open switch 30 has not been pressed, the process returns to step S1. In step S2, an optical signal 4a for instructing to open the door is transmitted to the controller 32, and the process proceeds to step S3. On the other hand, the controller 32 first determines whether or not the optical signal 4a has been received in step S101.If it is determined that the optical signal 4a has been received, the process proceeds to step S102, where the optical signal 4a is If it is determined that it has not been received, the process returns to step S101. In step S102, one of the codes 1 to n is determined as a random number, and the code 4b
To the IC card 34. Then, the process proceeds to step S103. On the other hand, in step S3, the IC card 34
It is determined whether or not the code 4b has been received.If it is determined that the code 4b has been received, the process proceeds to step S4, where the code 4b has been received.
If it is determined that has not been received, the process returns to step S3. In step S4, the value of the code 4b is identified. Then, the process proceeds to step S5, where an ID code that is an identification code corresponding to the code 4b is read from the memory 22. Next, proceeding to step S6, the ID code is transmitted to the controller 32 as an optical signal 4c. Then, in step S103, the controller 32 determines whether or not the optical signal 4c has been received. If the controller 32 determines that the optical signal 4c has been received, the process proceeds to step S104. If it is determined that the optical signal 4c has not been received, the process returns to step S103. Steps
In S104, it is determined whether or not the identification code of the optical signal 4c corresponds to the code 4b. If the identification code of the optical signal 4c corresponds to the code 4b, step
Proceeds to S105, where the identification code of the optical signal 4c is the code 4b
If not, the process proceeds to step S106. In step S105, the door gate 35 is unlocked and the door is opened. On the other hand, in step S106, the door gate 35 is left unlocked. When the door is closed with the IC card 34, the same operation as that when the door is opened is performed. According to this embodiment, since a plurality of identification codes corresponding to a plurality of random number codes are stored in the memory 22 in advance, the CPU 23 stores the identification codes corresponding to the random number codes from the controller 32 one-to-one. It can be called from 22 and sent to controller 32 as it is, simplifying signal processing.
I can do it quickly. Even if the person 33 carrying the IC card 34 is away from the door gate 35, the door open switch 30
Alternatively, by turning on the door close switch 31, the door gate 35 can be unlocked or locked by remote control. A door closing switch for locking the door gate 35
31 and door open switch 30 to unlock the door gate 35
This makes it possible to prevent a person 33 carrying the IC card 34 from giving a locking instruction and an unlock instruction by mistake. In the present embodiment, the light-receiving element and the light-emitting element are used for the transmitting and receiving unit, and the external device is remotely controlled by an optical signal. However, the wireless transmitting and receiving unit is used as the transmitting and receiving unit, and the external device is remotely controlled by radio waves. Is also good.

【The invention's effect】

As is apparent from the above description, the IC card of the present invention is configured such that the control unit assigns an identification code corresponding to a random number code received one-to-one from an external device that transmits a plurality of random number codes at random via a transmission / reception unit. By reading from the memory and transmitting the identification code corresponding to the random number code to the external device from the transmission / reception unit, the external device is remotely controlled, so that once the external device is remotely controlled by another transceiver, Receiving an identification code,
Using the same identification code as the above identification code, even if it is attempted to remotely control the external device by the another transceiver,
At this time, the probability that the identification code from the another transceiver corresponds to the random number code transmitted randomly by the external device is very small. Therefore, it is very difficult to remotely control the external device with the another transceiver,
An excellent remote control system for security can be realized. In addition, since a plurality of identification codes corresponding to a plurality of random number codes are stored in the memory in advance, the control unit calls the identification code corresponding to the random number code from the external device one-to-one from the memory, and directly reads the identification code from the memory. It can be sent to equipment, and signal processing can be done easily and quickly. Further, even if the user is away from the door, the door can be unlocked or locked by remote control by turning on the door open switch or the door close switch of the IC card carried. In addition, since the door close switch for locking the door and the door open switch for unlocking the door are separate, it is possible to prevent a user from giving a lock instruction and an unlock instruction by mistake.

[Brief description of the drawings]

FIG. 1 is a block diagram of an IC card according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of an entrance / exit management system using the above-described embodiment, and FIG. 3 is a flowchart illustrating the operation of the entrance / exit management system. FIG. 4 is a block diagram of a conventional IC card, and FIG. 5 is an explanatory diagram of an entrance / exit management system using the conventional IC card. 1,21 …… IC card body, 2,22 …… Memory, 3,23 …… CP
U, 10,34… IC card, 11, 32… Controller, 25… Light receiving element, 28… Light emitting element, 30… Door open switch, 31… Door close switch.

Claims (1)

(57) [Claims] A semiconductor function element constituting a memory and a control unit; a transmission / reception unit; and a power supply. When a reception signal is received from an external device via the transmission / reception unit, the control unit converts the reception signal to the reception signal. An IC card that reads a corresponding transmission signal from a memory, transmits the transmission signal from the transmission / reception unit to the external device, and remotely controls locking and unlocking of a door of the external device. A door open switch for transmitting a door open signal to a device; and a door close switch for transmitting a door close signal to the external device from the transmitting / receiving unit. The memory stores the door open signal or the door close signal in the external device. , A plurality of identification codes corresponding one-to-one to a plurality of random number codes randomly transmitted from the external device by receiving the An IC which reads an identification code corresponding to the random number code one-to-one from the memory when the random number code is received by the transmission / reception unit, and transmits the identification code to the external device from the transmission / reception unit. card.