JPH09303014A - Identification signal collating device, and method of collating identification signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance security by varying the time up to the transmission of an identification signal every communication. SOLUTION: In this identification signal checking device, a device 1 to be detected transmits a communication request signal to a detecting device 10, the detecting device 10 detects this communication request signal and transmits a communication permission signal to the device 1 to be detected, the device 1 to be detected transmits the identification signal of the device 1 to be detected to the detecting device 10 in replay to the communication permission signal, and the detecting device 10 collates the transmitted identification signal with a preliminarily stored identification signal. The time from the transmission of the communication request signal from the device 1 to be detected to the receipt of the identification signal is varied every communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an identification signal matching device and an identification signal matching method suitable for use in a keyless entry system.

[0002]

2. Description of the Related Art A keyless entry system has been previously proposed. In this conventional keyless entry system, an identification signal is transmitted from the key device to the lock device using infrared rays or radio waves to perform locking or unlocking.

In such a conventional keyless entry system, since the same identification signal is always transmitted from the key device side, when the communication is intercepted, the identification signal is easily stolen. There was a risk.

In particular, when an identification signal is transmitted using infrared rays, the identification signal can be easily copied by a so-called learning remote controller, which is a social problem.

Further, in the above keyless entry system, there is a big problem in terms of security such that a particular identification signal can be searched by repeatedly trying various identification signals.

In view of the above problems, an object of the present invention is to improve security with a relatively simple structure.

[0007]

The present invention transmits a communication request signal from a detected device to a detection device, detects this communication request signal, and transmits a communication permission signal from this detection device to this detected device. An identification signal of the detected device is transmitted from the detected device to the detection device in response to the communication permission signal, and the transmitted identification signal is collated with the previously stored identification signal in the detection device. In the identification signal collating device thus configured, the time from the transmission of the communication request signal by the detected device to the transmission of the identification signal is variable for each communication.

According to the present invention, since the time from the transmission of the communication request signal to the transmission of the identification signal in the detected device (key device) is variable for each communication, this identification signal is transmitted. The time when it is done is uncertain, and the security is enhanced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which an identification signal collating apparatus and an identification signal collating method of the present invention are applied to a keyless entry system for opening and closing a door will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a key device (device to be detected) having a portable structure. The key device 1 has a switch section 2 for instructing opening and closing of a door, a signal processing circuit section 3, and a lock described later. It has an infrared transmitting / receiving unit 4 for communicating with the device 10 and a memory unit 5 for storing a specific (self) identification signal ID.

The signal processing circuit section 3 is composed of a microcomputer. When the signal processing circuit section 3 commands the opening / closing of the door by the operation of the switch of the switch section 2, the signal processing circuit section 3 outputs an unlocking / locking command signal. A communication request signal including the communication request signal is formed, the communication request signal is supplied to the infrared transmitting / receiving unit 4, and the infrared requesting unit 4 transmits the communication request signal to the lock device 10.
To be sent.

Further, the signal processing circuit section 3 includes a lock device 10.
When a communication permission signal composed of, for example, a 24-bit random number signal X is received, a 24-bit specific (self) identification signal ID stored in the memory unit 5 is used as the 24-bit random number signal X, For example, a 24-bit code signal is encrypted by a predetermined function f (X, ID), and this encrypted signal f (X, ID) is locked.
Send to 0.

The function f (X, ID) is set to "1" when the corresponding bits are the same "1" or "0", and when the corresponding bits are different, as shown below. Is set to "0".

ID 010101010101010101010101101 X 1101110111011110111011101 ────────────────────────────────── f (X, ID)

Further, in this example, the time (timing) from the time of transmission of the communication request signal for transmitting the encrypted signal f (X, ID) obtained by encrypting the identification signal is made different for each communication. In this example, the lower 4 bits of the random number signal of, for example, 24 bits from the lock device 10 is "000" after receiving the communication permission signal by the lower 4 bits.
The transmission / reception timing is determined in advance, such as 10 seconds after "0" and 20 seconds after "0001".

Therefore, the signal processing circuit section 3 detects the lower 4 bits of the random number signal which is the communication permission signal, and the encrypted signal f (X, ID) obtained by encrypting this identification signal is used as the lock device 1.
0 is transmitted at the timing determined by the lower 4 bits of this random number signal.

Further, the infrared transmitting / receiving section 4 of the present example is constructed so as to perform communication by a well-known baseband system.
The baseband system can perform high-speed communication with low power consumption and has a simple circuit configuration, as compared with modulation systems such as ASK and FSK.

Reference numeral 10 denotes a lock device which is fixedly provided at a predetermined position in relation to the door. The lock device 10 includes an infrared transmitting / receiving unit 11 for communicating with the key device 1, a signal processing circuit unit 12, and a signal processing circuit unit 12. , A memory unit 13 for storing a specific (self) identification signal ID, a communication permission signal generating means 14 for generating a communication permission signal, and a drive for controlling locking or unlocking by a command signal from the signal processing circuit unit 12. And a part 15.

As the communication permission signal generating means 14,
For example, a 24-bit binary counter is used, the 24-bit binary counter is caused to count with a predetermined clock signal regardless of communication, and when a communication request signal from the key device 1 is received, By stopping the 24-bit binary counter and reading the numerical value, a communication permission signal composed of, for example, a 24-bit random number signal is obtained.

The signal processing circuit unit 12 is composed of a microcomputer. When the signal processing circuit unit 12 receives a communication request signal from the key device 1, it receives a communication request signal of, for example, 100 ms as shown in FIG. 3C. After the completion, the lock device 10 transmits a communication permission signal composed of the random number signal X from the communication permission signal generating means 14 to the key device 1.

The signal processing circuit section 12 determines the receivable timing of the encrypted signal f (X, ID) obtained by encrypting the identification signal ID from the key device 1 by the lower 4 bits of the transmitted random number signal X. It is assumed that no reception is made other than the determined receivable time.

Further, the signal processing circuit section 12 is the key device 1.
When an encrypted signal f (X, ID) obtained by encrypting the identification signal ID using the random number signal X is received, a predetermined function f ⁻¹ is used using the previously transmitted, for example, 24-bit random number signal. {F (X, ID), X} gives the encrypted signal f
(X, ID) is decrypted, and it is checked whether the identification signal obtained by the decryption is a specific (own) identification signal ID previously stored (registered) in the memory unit 13.

As a result of this collation, the signal processing circuit section 12 follows the door opening / closing command included in the communication request signal when the decoded identification signal matches the previously stored (registered) identification signal ID. The unlocking or locking command signal is supplied to the drive unit 15 to open or close the door.

Further, the infrared transmitting / receiving unit 11 of this example has the same configuration as the infrared transmitting / receiving unit 4 described above, and is configured to perform communication by a well-known baseband system.
In FIG. 1, reference numerals 6 and 16 denote batteries for operating the key device 1 and the lock device 10, respectively.

The operation of the keyless entry system for opening and closing the door of the above example will be described below with reference to the flowchart of FIG. 2 and the time chart of FIG. In this example, the same identification (self) is first stored in the memory units 5 and 13 respectively.
It is assumed that the identification signal ID of, for example, a 24-bit code is registered (stored).

First, the switch section 2 of the key device 1 is operated,
The switch is turned on, and a command to open or close the door is issued (step S1). At this time, a communication request signal including a command signal for opening or closing the door is set to 100 as shown in FIG. 3A, for example.
The data is transmitted from the key device 1 to the lock device 10 within ms (step S2).

When the lock device 10 receives this communication request signal (step S3, see FIG. 3D), the lock device 1
As shown in FIG. 3C, 0 obtains a communication permission signal from the communication permission signal generating means 14 consisting of, for example, a 24-bit random number signal X after completion of this communication request signal (step S4),
As shown in FIG. 3C, the communication permission signal including the random number signal X is transmitted to the key device 1 for 30 ms, for example (step S5).

The key device 1 receives the communication permission signal composed of the random number signal X after the end of the communication request signal (step S
6, see FIG. 3B), the key device 1 uses the 24-bit random number signal X, for example, to predetermine a specific (self) identification signal ID stored (registered) in the memory unit 5. A code of 24 bits is encrypted by the function f (X, ID) to obtain a code signal f (X, ID) (step S7), and this code signal f (X, ID) is stored for 30 ms as shown in FIG. 3A. The data is transmitted to the lock device 10 (step S8).

In this case, the key device 1 sends the encrypted signal f
The timing of transmitting (X, ID) is determined by the lower 4 bits of the random number signal which is the communication permission signal, and is transmitted at this timing. Since this timing is determined by the lower 4 bits of the random number signal, the timing is different for each communication.

The lock device 10 receives the encrypted signal f (X, ID) obtained by encrypting the identification signal ID only when the encrypted signal f (X, ID) is transmitted within the receivable time determined by the lower 4 bits of the random number signal. (See step S9, FIG. 3D).

The encrypted signal f (X, ID) is transferred to the lock device 10.
Is received, the lock device 10 uses a random number signal X that previously transmits the received encrypted signal f (X, ID), and uses a predetermined function f ⁻¹ {f (X, ID), X}. By decoding (step S10), the decoded identification signal and the specific (self) identification signal ID of the memory unit 13 previously stored (registered) are collated (step S11), and the result of this collation is deciphered. Registered identification signal first (memorized)
When it coincides with the specified (self) identification signal ID, the unlocking or locking command signal is supplied to the drive unit 15 to unlock or lock the door according to the door opening or closing command signal of the communication request signal. Control of opening or closing (step S1)
2).

According to this example, in the key device 1 as shown in FIG. 3, the time from the transmission of the communication request signal to the transmission of the identification signal is determined by the lower 4 bits of the random number signal which is the communication permission signal. Since this time is different for each communication, the time when the identification signal is transmitted is indefinite, it is difficult to intercept the identification signal, and there is an advantage that security is improved.

In this example, each time the door is opened or closed, the lock device 10 generates a communication permission signal composed of the random number signal X, and the key device 1 uses the random number signal X to identify the ID signal ID.
And the encrypted signal f (X, ID) is encrypted by the lock device 10.
Since the two-way spatial communication is always a different signal, even if the communication signal is intercepted, there is no risk of the specific (self) identification signal ID being stolen.

Further, according to the present example, the probability that the code signals coincide with each other no matter how many times it is tried, for example, in the case of a 24-bit code signal, it is always about 16.7 million, which is extremely high security. There is a benefit that can easily realize the nature.

Next, another embodiment of the present invention will be described with reference to FIGS. 1, 4 and 5. In this other embodiment, the power of the lock device 10 of FIG. 1 is saved during the waiting period to save power, so as shown in FIG.
It is an intermittent power supply that repeatedly turns off. In this example, the communication request signal from the key device 1 is received synchronously when the intermittent power supply is turned on, and then the power supply is turned on (see FIGS. 5D and 5F).

The communication permission signal generating means 14 is configured to generate a predetermined communication permission signal as shown in FIG. 5E after a fixed period, for example, 130 ms, after the communication request signal is read by the signal processing circuit section 12.

Further, in the key device 1, as shown in FIG. 5B, when the communication permission signal is received, the lock device 10 is directly encrypted without encrypting the identification signal ID for 30 ms after a fixed time, for example, 80 ms after the reception. To send to. Others are similar to those in FIG.

The operation of the other embodiment will be described below with reference to FIG.
This will be described with reference to the flowchart of FIG. Also in this example, the memory units 5 and 1 are first
It is assumed that the same specific (self) identification signal ID, for example, an identification signal ID composed of a 24-bit code, is registered (stored) in each of the numbers 3.

First, by operating the switch section 2 of the key device 1,
The switch is turned on (the power is turned on as shown in FIG. 5A), and an instruction to open or close the door is issued (step S1). At this time, the communication request signal including the command signal for opening or closing the door,
For example, as shown in FIG. 5B, the key device 1 transmits the data for 120 ms (step S2).

The lock requesting device 10 receives the communication request signal in synchronization with the intermittent power supply during the waiting period of the lock device 10 (step S13, see FIG. 5F), and deciphers the communication request signal. In this case, since the generation of the communication request signal is asynchronous with the intermittent power supply of the lock device 10, as shown in FIG.
The time from the generation of the communication request signal until the reading of the communication request signal of the lock device 10 is indefinite, and becomes different for each communication.

When the lock requesting device 10 deciphers the communication request signal, the lock requesting device 10 obtains a predetermined communication enable signal from the communication enable signal generating means 14 as shown in FIG. For 30 ms (step S14).

When the key device 1 receives the communication permission signal (step S15, see FIG. 5C), the key device 1 receives the communication permission signal for a predetermined time, for example, 80 ms.
Specific (self) stored (registered) in the memory unit 5 later
The identification signal ID of is transmitted to the lock device 10 for, for example, 30 ms (step S16).

In this case, as shown in FIG. 5, the time from the generation of the communication request signal to the transmission of the identification signal ID in the key device 1 is indefinite because it is determined by the intermittent power supply of the lock device 10, and is different for each communication. It will be.

When the lock device 10 receives the identification signal ID (step S17, see FIG. 5F), the lock device 10 and the identification signal stored in the memory unit 13 are registered (registered) in advance. As a result of this collation with the identification signal ID of its own (step S18), the received identification signal is the identification signal ID of the particular (self) that was previously registered (stored).
If it coincides with the above, in accordance with the door opening or closing command signal of the communication request signal, an unlocking or locking command signal is supplied to the drive unit 15 to unlock or lock, and the opening or closing of the door is controlled (step S19).

According to this example, as shown in FIG. 5, the key device 1
In the above, since the time from the transmission of the communication request signal to the transmission of the identification signal ID is determined by the intermittent power supply of the lock device 10, it is undefined, and this time differs for each communication.
Since it is uncertain when the identification signal is transmitted, it is difficult to intercept the identification signal, and there is an advantage that security is enhanced.

In the above-mentioned embodiment, the infrared communication is used as the base band system for the communication between the key device 1 and the lock device 10. However, instead of this, a modulation system such as ASK or FSK may be used by using infrared light. Of course, radio waves or ultrasonic waves may be used instead of the infrared rays.

Further, in the above-mentioned embodiment, the communication permission signal is composed of the random number signal, but this communication permission signal does not need to be composed of the random number signal, and the identification signal transmitted from the key device 1 needs to be encrypted. There is no. In addition, it goes without saying that a random number signal may be used as the communication permission signal in the other embodiments described above.

In the above example, the communication request signal is described to include the lock or unlock command signal. However, the lock or unlock command signal is added to the encrypted signal f (X, ID). Alternatively, it may be transmitted separately.

Further, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0050]

According to the present invention, the detected device (key device)
In the above, the time from the transmission of the communication request signal to the transmission of the identification signal is different for each communication, the time when the identification signal is transmitted is uncertain, it is difficult to intercept this identification signal, and security is improved. There are profits to be made.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an identification signal matching device of the present invention.

FIG. 2 is a diagram for explaining an example of the present invention.

FIG. 3 is a diagram provided for explaining an example of the present invention.

FIG. 4 is a diagram used for explaining another example of the present invention.

FIG. 5 is a diagram used for explaining another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 key device, 2 switch part, 3,12 signal processing circuit part, 4,11 infrared transmitting / receiving part, 5,13 memory part, 10 lock device, 14 communication permission signal generating means, 15
Drive part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location H04L 9/32 H04Q 9/00 301B H04Q 9/00 301 311L 311 H04L 9/00 673C 673B

Claims (8)

[Claims] 1. A detection request device transmits a communication request signal to a detection device, detects the communication request signal, transmits a communication permission signal from the detection device to the detection target device, and responds to the communication permission signal. By transmitting the identification signal of the detected device from the detected device to the detection device, and the detection device collates the transmitted identification signal with a previously stored identification signal. In the identification signal collating apparatus, the time from the transmission of the communication request signal by the detected device to the transmission of the identification signal is variable for each communication. 2. The identification signal matching device according to claim 1, wherein the detection device has an intermittent power supply, detects the communication request signal at a timing when the intermittent power supply is turned on, and the predetermined time after the detection. The detection device transmits the communication permission signal to the detection target device, and the detection target device transmits the identification signal after a predetermined time of receiving the communication permission signal, whereby the detection target device transmits the communication request signal. An identification signal matching device, wherein the time from the transmission to the transmission of the identification signal is variable. 3. The identification signal collating apparatus according to claim 1, wherein the communication permission signal is a random number signal, and the identification is performed after the detected apparatus receives the random number signal according to a pattern of the random number signal. Identification by varying the time until the signal is transmitted so that the time from when the device to be detected transmits the communication request signal to when the identification signal is transmitted is variable. Signal matching device. 4. The identification signal collating device according to claim 1, wherein the detected device is a key device, the detecting device is a locking device, and the locking device is provided with a locking means and / or an unlocking means. An identification signal matching device, characterized in that the locking means and / or the unlocking means are controlled according to the result. 5. A communication request signal is transmitted from a detected device to a detection device, the communication request signal is detected, a communication permission signal is transmitted from the detection device to the detected device, and a response is sent to the communication permission signal. In the identification signal matching method, the identification signal of the detected device is transmitted from the detected device to the detection device, and the transmitted identification signal and the previously stored identification signal are compared in the detection device. An identification signal matching method, wherein the time from the transmission of the communication request signal by the detected device to the transmission of the identification signal is variable for each communication. 6. The identification signal matching method according to claim 5, wherein the detection device has an intermittent power supply, detects the communication request signal at a timing when the intermittent power supply is turned on, and the predetermined time after the detection. The detection device transmits the communication permission signal to the detection target device, and the detection target device transmits the identification signal after a predetermined time of receiving the communication permission signal, whereby the detection target device transmits the communication request signal. An identification signal matching method, wherein the time from the transmission to the transmission of the identification signal is variable. 7. The identification signal matching method according to claim 5, wherein the communication permission signal is a random number signal, and the device to be detected receives the random number signal according to a pattern of the random number signal, and then the identification is performed. Identification by varying the time until the signal is transmitted so that the time from when the device to be detected transmits the communication request signal to when the identification signal is transmitted is variable. Signal matching method. 8. The identification signal matching method according to claim 5, wherein the detected device is a key device, the detection device is a locking device, and the locking device is provided with locking means and / or unlocking means. An identification signal matching method, characterized in that the locking means and / or the unlocking means are controlled according to a result.