JPH1030367A - Identification signal matching device and identification signal matching method - Google Patents

Abstract

(57) [Summary] An object of the present invention is to improve security and eliminate the need to manage a pair of a key device (detected device) and a lock device (detected device). SOLUTION: A device to be detected 1 having a first wireless transmission / reception unit 4, a first signal processing unit 3, and a first memory unit 5 for storing an identification signal, a second wireless transmission / reception unit 11, a second A signal processing unit 12, a second memory unit 13 for storing an identification signal, and a detection device 10 having a random number generation unit 14, and a response request signal from the detected device 1 is received by the detection device 10. Then, the detection device 10 transmits the random number signal X from the random number generation unit 14, and when the detected device 1 receives the random number signal X, the random number signal X 1, the identification signal ID stored in the memory unit 5 is encrypted, the encrypted identification signal is transmitted to the detection device 10, and the detection device 10 decrypts the encrypted identification signal. The identification signal stored in the second memory unit 13 is Is obtained so as to match if it matches the.

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 Conventionally, a keyless entry system has been 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 one-way communication in which the same identification signal is always transmitted from the key device side, when this communication is intercepted, the identification signal is easily stolen. There was danger.

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, the above-mentioned keyless entry system has a serious problem in terms of security such that a specific identification signal can be searched by repeatedly trying various identification signals.

[0006] Therefore, first, a password is transmitted from the portable device (key device) to the main device (lock device), and the main device transmits its own password calculated by the numerical signal processing and the received password. A keyless entry system has been proposed which determines the match between the two (see JP-A-7-269196,
JP-A-7-274258).

[0007] In the keyless entry system proposed above, the main unit determines whether or not its own password calculated in the arithmetic processing of the numerical signal coincides with the received password. Sex is enhanced.

[0008] However, in the keyless entry system with good security proposed above, it is necessary to determine whether or not the password value obtained by performing arithmetic processing of the numerical signal in the main unit and the received password value coincide with each other. When manufacturing the portable device and the main device, the portable device (key device) and the main device (lock device) are manufactured, and then a specific device is designated from the portable device to the main device. An identification signal is transmitted, and the same specific identification signal cannot be registered in the portable device and the main device.

For this reason, conventionally, this portable device (key device)
Since the same specific identification signal was registered at the manufacturing stage of the main unit (lock device) and the main unit (lock device), the portable device (key device) and the main unit (lock device) were Must be managed as a pair, which is inconvenient in terms of efficient management and logistics.

In view of the above, the present invention needs to be able to enhance security with a relatively simple configuration and to manage a key device (detected device) and a lock device (detecting device) in pairs. The purpose is not to be.

[0011]

According to the present invention, there is provided an identification signal matching apparatus comprising a first wireless transmission / reception section, a first signal processing section, and a detection target apparatus having a first memory section for storing an identification signal; A detection device having a wireless transmission / reception unit, a second signal processing unit, a second memory unit for storing an identification signal, and a random number generation unit, and the detection device receives a response request signal from the detected device; At this time, the detection device transmits a random number signal from the random number generation unit. When the detected device receives the random number signal, the random number signal is used to store the random number signal in the first memory unit. Encrypting the stored identification signal, transmitting the encrypted identification signal to the detection device, and decrypting the encrypted identification signal in the detection device, wherein the decrypted identification signal is stored in the second memory. Remembered in the department It is obtained so as to match if it matches the other signal.

According to the present invention, the detection device (lock device)
The identification signal transmitted from the detected device to the detection device is transmitted from the detected device (key device) by encrypting the identification signal using the random number signal and transmitting the encrypted identification signal to the detection device. Is an encrypted signal encrypted by this random number signal, which is always a different signal, and has improved security.

Further, according to the present invention, since the encrypted identification signal is decrypted in the detecting device, even if the device to be detected and the detecting device are manufactured and distributed separately, the detecting device can be used. Since the encrypted identification signal transmitted from the device to be detected (key device) when assembled into a door or the like is decrypted by this detection device (lock device) to obtain a specific identification signal, this decryption is performed. If the detected identification signal is registered in the detection device (lock device), the same identification signal can be registered in the detected device (key device) and the detection device (lock device).

[0014]

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 configuration. The key device 1 includes a switch unit 2 for instructing opening and closing of a door, a signal processing circuit unit 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 (own) identification signal ID.

The signal processing circuit section 3 is composed of a microcomputer. When the signal processing circuit section 3 instructs opening and closing of a door by operating a switch of the switch section 2, the signal processing circuit section 3 transmits an unlock / lock command signal. A response request signal including the response request signal is supplied to the infrared transmission / reception unit 4, and the response request signal is transmitted from the infrared transmission / reception unit 4 to the lock device 10.
To be sent.

The signal processing circuit unit 3 is provided with a lock device 10.
When a 24-bit random number signal X is received, for example, the 24-bit specific identification signal ID stored in the memory unit 5 is converted to a predetermined function f ( (X, ID), for example, it is encrypted to a 24-bit code signal, and the encrypted signal f (X, ID) is transmitted to the lock device 10.

The function f (X, ID) is set to "1" when the corresponding bits are the same "1" or "0", for example, as shown below. When the corresponding bits are different from each other, Is set to “0”.

ID 010101010101010101010101101 X 110111011101110111011101 ｆ f (X, ID) 011101110111011101110111 The infrared transmission / reception unit 4 in the example is configured to perform communication using a 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 and a signal processing circuit unit 12. A memory unit 13 for storing a specific (own) identification signal ID, a random number generating unit 14 for generating a random number signal, and a driving unit 15 for controlling locking or unlocking by a command signal from the signal processing circuit unit 12. have.

The random number generating unit 14 includes, for example, 24
A 24-bit binary counter is used. The 24-bit binary counter is counted by a predetermined clock signal irrespective of communication. When a response request signal from the key device 1 is received, Stop the bit binary counter,
By reading the numerical value, for example, a 24-bit random number signal is obtained.

The signal processing circuit 12 is composed of a microcomputer. When the signal processing circuit 12 receives a response request signal from the key device 1, the signal processing circuit 12 A signal is transmitted to the key device 1.

The signal processing circuit section 12 is provided in 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.

When the decoded identification signal matches the identification signal ID stored (registered) earlier as a result of the comparison, the signal processing circuit section 12 follows the door opening / closing command included in the response request signal. The unlocking or locking command signal is supplied to the drive unit 15 to open or close the door.

The infrared transmission / reception unit 11 of this embodiment has the same configuration as the infrared transmission / reception unit 4 described above, and is configured to perform communication using a 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.

Hereinafter, the operation of the keyless entry system for opening and closing the door of the above-described example will be described 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 unit 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 response request signal including a command signal for opening or closing the door is transmitted from the key device 1 as shown in FIG.
Is transmitted to the lock device 10 for 100 ms (step S2).

When the lock device 10 receives the response request signal (step S3, see FIG. 3D), the lock device 1
0 obtains, for example, a 24-bit random number signal X from the random number generator 14 (step S4), and transmits the random number signal X to the key device 1 for, for example, 30 ms as shown in FIG. 3C (step S5).

When the key device 1 receives the random number signal X (step S6, see FIG. 3B), the key device 1
Using this 24-bit random number signal X, a specific (own) identification signal ID registered in the memory unit 5 is encrypted into a 24-bit code by a predetermined function f (X, ID), and the encrypted signal f (X, ID) (step S
7), the encryption signal f (X, ID) is transmitted to the lock device 10 for, for example, 30 ms as shown in FIG. 3A (step S8).

The encryption signal f (X, ID) is transmitted to the lock device 10
Is received (step S9, see FIG. 3D), the lock device 10 uses the random number signal X previously transmitted from the received encrypted signal f (X, ID) to obtain a predetermined function f
^-1 {f (X, ID), X} (step S1
0), the decoded identification signal is compared with the specific (own) identification signal ID of the memory unit 13 previously registered (step S11), and as a result of this comparison, the decoded identification signal is registered first. When it matches the stored (identified) identification signal ID of the specific (self), the unlocking or locking command signal is supplied to the driving unit 15 in accordance with the door opening or closing command signal of the response request signal to unlock or lock. Then, the opening or closing of the door is controlled (step S12).

In this embodiment, the lock device 10 generates a random number signal X each time the door is opened and closed, and the key device 1 encrypts the identification signal ID using the random number signal X. Since (X, ID) is transmitted to the lock device 10, the two-way spatially communicated signals are always different signals.
For example, even if this communication signal is intercepted, there is no danger that the specific (own) identification signal ID is stolen.

In addition, according to this example, the probability of coincidence of the code signal does not change by chance no matter how many attempts are made. For example, in the case of a 24-bit code signal, it is always about 16.7 million, which is extremely high security. There are benefits that can easily be realized.

Further, according to this embodiment, since the encrypted identification signal is decrypted in the lock device 10, even if the key device 1 and the lock device 10 are manufactured and distributed separately, the lock device 10 When the lock device 10 is incorporated in a door or the like, the encryption device f (X, ID) transmitted from the key device 1 is decrypted by the lock device 10 to obtain a specific (own) identification signal ID. The identification signal obtained by the decoding is transmitted to the lock device 10.
In this case, the same identification signal ID can be registered in the key device 1 and the lock device 10.

Therefore, according to this embodiment, there is no need to manage the key device 1 and the lock device 10 in pairs, and there is an advantage that efficient management and physical distribution can be performed.

FIGS. 4 and 5 show another embodiment of the identification signal matching apparatus of the present invention. 4 and 5, another embodiment of the present invention will be described. In FIG. 4, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the example of FIG. 4, the key device 1 has a portable structure.
In the non-volatile memory section 5, a plurality of, for example, 16 identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ are stored. In the signal processing circuit unit 3 of the key device 1, when a 24-bit random number signal X is received from the lock device 10, for example, the lower 4-bit random number signals X ₁ , X ₂ ‥‥ X of the 24 bits ₁₆ determines, when the random number signal of 4 bits of the low order is, for example, X _1, the random number signal X ₁
Thus, one of the 16 identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ , for example, ID ₁ stored in the memory unit 5 is selected. In this example, as shown in Table 1, the lower 4 bits of the received random number signals X ₁ , X ₂
The ₁₆ identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ stored in the memory unit 5 correspond to ‥‥ X ₁₆ in a one-to-one correspondence.

[0037]

TABLE 1 lower 4 random identification signal bit encryption signal _{X 1 = 0000 ID 1 f (} X, ID 1) X 2 = 0001 ID 2 f (X, ID 2) X 3 = 0010 ID 3 f (X, ID ₃ ) :::::::: X ₁₆ = 1111 ID ₁₆ f (X, ID ₁₆ ) In this example as well, the 16 identification signals ID ₁ and ID ₂ ‥‥ ID ₁₆ stored in the memory unit are 24, for example. Bit.

In this embodiment, the signal processing circuit unit 3 converts the received random number signal X into
One of the identification signals ID ₁ , ID ₂ ‥‥ I selected as shown in Table 1 with the lower 4 bits of random number signals X ₁ , X ₂下 位 X ₁₆
D ₁₆ is encrypted, and an encrypted signal f (X, ID
₁ ), f (X, ID ₂ ) ‥‥ f (X, ID ₁₆ ), and the obtained encrypted signals f (X, ID ₁ ), f (X, I
D ₂ ) ‥‥ f (X, ID ₁₆ ) is transmitted to the lock device 10.

The memory unit 13 of the lock device 10 shown in FIG.
The same, for example, 16 stored in the memory unit 5 of the key device 1
The identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ are stored.

The signal processing circuit unit 1 of the lock device 10
2 stores, for example, a 24-bit random number signal X from the random number generator 14 transmitted in response to the response request signal from the key device 1, and stores the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥ X ₁₆ , for example, 16 identification signals ID ₁ , I stored in the memory unit 13 as in the key device 1.
D ₂ ‥‥ One of ID ₁₆ is selected.

In this case, the identification signal selected by the random number signal X ₁ , X ₂ ‥‥ X ₁₆ of the lower 4 bits of the random number signal X in the key device 1 and the lower 4 bits of the random number signal X
The identification signal selected by the bit random number signals X ₁ , X ₂ ‥‥ X ₁₆ is the same as the identification signal.

Further, the signal processing circuit section 12 is a key device 1
Signals f (X, ID ₁ ), f obtained by encrypting the selected identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ with a random number signal X
When (X, ID ₂ ) ‥‥ f (X, ID ₁₆ ) is received,
For example, the previously transmitted 24-bit random number signal X and the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥ X ₁₆
Identification signal ID which is selected in in the selected example a random number signal X _1
1 , a predetermined function f ^-1 ｛f (X, I
D ₁ ), X｝, the encrypted signal f (X, ID ₁ ) is decrypted, and the identification signal ID ₁ obtained by decrypting the encrypted signal f (X, ID ₁ ) and the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥ X
_The identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ selected at ₁₆ are compared with, for example, the identification signal ID ₁ .

The rest of the configuration is the same as in FIG.

The operation of the keyless entry system for opening and closing the door in the example of FIG. 4 will be described with reference to the flowchart of FIG. In this example, it is assumed that the same 16 identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ made up of, for example, 24-bit codes are registered (stored) in the memory units 5 and 13.

First, the switch unit 2 of the key device 1 is operated,
A command is issued to open or close the door (step S1). At this time, a response request signal including a command signal for opening or closing the door is transmitted from the key device 1 for 100 m as shown in FIG.
This is transmitted to the interlock device 10 (step S2).

When the lock device 10 receives this response request signal (step S3, see FIG. 3D), the lock device 1
0 obtains, for example, a 24-bit random number signal X from the random number generator 14 (step S4), and transmits the random number signal X to the key device 1 for, for example, 30 ms as shown in FIG. 3C (step S5).

When the key device 1 receives the random number signal X (step S6, see FIG. 3B), the key device 1 generates the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥
In X _16, selects one of the identification signal, for example the identification signal ID ₁ of the memory portion of 16 units registered in the 5 identification signal _{ID 1, ID 2 ‥‥ ID 16} ( step S7).

Next in the key device 1, the selected identification signals ID ₁ using the example of a 24-bit random number signal X, a predetermined function f (X, ID ₁₎ by the 24-bit code Encrypts the encrypted signal f (X, ID
₁ ) (step S8), and the encrypted signal f (X, ID)
₁ ), for example, for 30 ms, as shown in FIG. 3A.
0 (step S9).

The encryption signal f (X, ID ₁ ) is transmitted to the lock device 1
0 is received (step S10, see FIG. 3D), the lock device 10 receives the encrypted signal f (X, I
D ₁ ) is decoded by a predetermined function f {f (X, ID ₁ ), X} using the previously transmitted random number signal X (step S 11).

The 16 identification signals I 1 registered in the memory unit 13 selected by the decoded identification signal ID ₁ and the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥ X ₁₆ of the random number signal X
D ₁ , _one of ID ₂ 16ID ₁₆ , for example, the identification signal I
Collates the D ₁ (step S12), the result of this collation,
The decoded identification signal ID ₁ is the selected identification signal ID ₁
When it matches, the unlocking or locking command signal is supplied to the drive unit 15 in accordance with the door opening or closing command signal of the response request signal to unlock or lock, and the opening or closing of the door is controlled (step S13). ).

Since the example of FIG. 4 is configured as described above, it can be easily understood that the same operation and effect as those of the example of FIG. 1 can be obtained. Further, in the example of FIG.
Since the identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ are selected by the random number signals X ₁ , X ₂ ‥‥ X ₁₆ of the lower 4 bits of the random number signal X, there is an advantage that the security is further improved. .

FIGS. 6 and 7 show still another embodiment of the identification signal collating apparatus of the present invention. Referring to FIGS. 6 and 7, still another embodiment of the present invention will be described. In FIG. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the example of FIG. 6, the key device 1 has a portable structure.
In the non-volatile memory section 5, a specific (own) identification signal ID and a plurality of, for example, 16 functions f ₁ , f ₂ ‥‥ f
Make sure to remember ₁₆ .

In the signal processing circuit of the key device 1, when a 4-bit random number signal X is received from the lock device 10, for example, the lower 4-bit random number signals X ₁ and X _{2 of the} 24 bits are received. ‥‥ the X ₁₆ judges, of the lower 4
The random number signal X when the random number signal bit is, for example, X _{1
By 1} , _one of the 16 functions f ₁ , f ₂ ‥‥ f ₁₆ , for example, the function f ₁ stored in the memory unit 5 is selected.

In this example, as shown in Table 2,
Random number signals X ₁ , X ₂の of lower 4 bits of the 4 bits
The ₁₆ functions f ₁ , f ₂ ‥‥ f ₁₆ stored in the memory unit 5 correspond to ‥ X ₁₆ on a one-to-one basis.

[0056]

[Table 2] Lower 4 bits random number function Encryption signal X ₁ = 0000 f ₁ f ₁ (X, ID) X ₂ = 0001 f ₂ f ₂ (X, ID):::::: X ₁₆ = 1111 f ₁₆ f ₁₆ (X, ID) Also in this example, the identification signal ID stored in the memory unit 5 is, for example, 24 bits.

Further, in this example, the signal processing circuit unit 3 uses the received random number signal X and the random number signals X ₁ , X ₂ ‥‥ X ₁₆ of the lower 4 bits of the random number signal X as shown in Table 2. The identification signal ID is encrypted by one selected function f ₁ , f ₂ ‥‥ f _16, and the encrypted signal f _{1 as} shown in Table 2 is obtained.
(X, ID), f ₂ (X, ID) ‥‥ f ₁₆ (X, ID)
, And the obtained encrypted signal f ₁ (X, ID), f
₂ (X, ID) ‥‥ f ₁₆ (X, ID) is transmitted to the lock device 10.

The memory unit 13 of the lock device 10 shown in FIG.
The same identification signal I stored in the memory unit 5 of the key device 1
D and a plurality of, for example, 16 functions f ₁ , f ₂ ‥‥ f ₁₆ are stored.

The signal processing circuit 1 of the lock device 10
2 stores, for example, a 24-bit random number signal X from the random number generator 14 transmitted in response to the response request signal from the key device 1, and stores the lower 4 bits of the random number signal X ₁ , For example, 16 functions f ₁ , f ₂ } stored in the memory unit 13 in the same manner as the key device 1 with X ₂ ‥‥ X ₁₆
One of f ₁₆ is selected.

In this case, functions f ₁ , f ₂ ‥‥ f ₁₆ selected by the random number signals X ₁ , X ₂ ‥‥ X ₁₆ of the lower 4 bits of the random number signal X in the key device 1 and the lock device 10 The functions f ₁ , f ₂ ‥‥ f ₁₆ selected by the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥ X ₁₆ are the same.

The signal processing circuit section 12 is a key device 1
Function f ₁ , f ₂ ‥‥ f
₁₆ and an encrypted signal f ₁ (X, I
D), when f ₂ (X, ID) ‥‥ f ₁₆ (X, ID) is received, the previously transmitted, for example, 24-bit random number signal X
And random number signals X ₁ , X of lower 4 bits of the random number signal X
₂ function using the function f ₁ selected in the selected example a random number signal X ₁ in ^{_{‥‥ X 16 f 1 -1 {f}} 1 (X, ID), X} by, the encryption signal f ₁ (X, ID) The decryption is performed, and the identification signal ID obtained by the decryption is compared with the identification signal ID previously registered in the memory unit 13.

Otherwise, the configuration is the same as that of FIG.

The operation of the keyless entry system for opening and closing the door in the example of FIG. 6 will be described with reference to the flowchart of FIG. In this example, the same identification signal ID and 16 functions f ₁ , f ₂ ‥‥
It shall be registered (stored) to f _16.

First, the switch unit 2 of the key device 1 is operated,
A command is issued to open or close the door (step S1). At this time, a response request signal including a command signal for opening or closing the door is transmitted from the key device 1 for 100 m as shown in FIG.
This is transmitted to the interlock device 10 (step S2).

When the lock device 10 receives this response request signal (step S3, see FIG. 3D), the lock device 1
0 obtains, for example, a 24-bit random number signal X from the random number generator 14 (step S4), and transmits this random number signal X to the key device 1 for 30 ms, for example, as shown in FIG. 3C (step S5).

When the key device 1 receives the random number signal X (step S6, see FIG. 3B), the key device 1 generates the lower 4 bits of the random number signal X ₁ , X ₂ ‥‥
At X ₁₆ , one of the 16 functions f ₁ , f ₂ ‥‥ f ₁₆ registered in the memory unit 5, for example, the function f ₁
Is selected (step S7).

Next, in the key device 1, the identification signal ID is encrypted into a 24-bit code by using the selected function f ₁ and the 24-bit random number signal X, for example.
An encrypted signal f ₁ (X, ID) is obtained (step S8), and this encrypted signal f ₁ (X, ID) is, for example, 3 as shown in FIG.
The data is transmitted to the lock device 10 for 0 ms (step S9).

The encryption signal f ₁ (X, ID) is transmitted to the lock device 1
When 0 is received (step S10, see FIG. 3D), the lock device 10 transmits the received encrypted signal f ₁ (X, ID) to the previously transmitted random number signal X and the lower 4 bits of the random number signal X of the random number signal X. ₁ , the function f ₁ selected by X ₂ ‥‥ X ₁₆
And decryption by the function f ₁ ^-1 {f ₁ (X, ID), X} (step S11).

The decoded identification signal ID and the memory unit 1
3 (step S1).
2) As a result of this collation, when the decoded identification signal ID matches the identification signal ID registered in the memory unit 13, the drive unit 15 is unlocked or locked in accordance with the response opening / closing command signal of the response request signal. A command signal is supplied to perform unlocking or locking, and control the opening or closing of the door (step S13).

Since the example of FIG. 6 is configured as described above, it can be easily understood that the same operation and effect as those of the example of FIG. 1 can be obtained. In the example of FIG.
Since the functions f ₁ and f ₂ ‥‥ f ₁₆ to be encrypted are selected as random number signals X ₁ , X ₂ ‥‥ X ₁₆ of the lower 4 bits of the random number signal X, the advantage that the security is further improved There is.

In the above embodiment, the communication between the key device 1 and the lock device 10 is based on the baseband system using infrared rays. However, instead of this, the modulation system such as ASK or FSK may be used using infrared rays. Of course, radio waves or ultrasonic waves may be used instead of the infrared rays.

The random number signal, identification signal and encryption signal are 2
The number of bits does not need to be 4 bits, and the number of bits may be determined according to the required degree of security.

Further, in the above-described example, the locking or unlocking command signal is included in the response request signal. However, this locking or unlocking command signal may be added to the above-mentioned encryption signal. It may be transmitted alone.

In the above-described example, the information is stored.
Identification signal ID ₁ , ID ₂ ‥‥ ID ₁₆ or function f ₁ , f ₂
Although the number of ‥‥ f ₁₆ is set to 16, this number does not need to be 16 and may be any number depending on the required degree of security.

In the above embodiment, the random number signal X
The identification signals ID ₁ , ID ₂ ‥‥ ID ₁₆ or the function f ₁ , using the lower 4 bits of the random number signals X ₁ , X ₂ ‥‥ X ₁₆ of
Although f ₂ ‥‥ f ₁₆ is selected, it does not need to be the lower 4 bits of the random number signal X, and the identification signal ID ₁ , ID ₂ ‥‥ ID ₁₆
Alternatively, the functions f ₁ and f ₂ ‥‥ f ₁₆ may be selected.

The present invention is not limited to the above-described embodiment, but may, of course, adopt various other configurations without departing from the gist of the present invention.

[0077]

According to the present invention, a random number signal is transmitted from a detecting device (lock device), and the detected device (key device)
Since the identification signal is encrypted using this random number signal and transmitted to the detection device (lock device), the identification signal transmitted from the detected device (key device) to the detection device (lock device) is the random number. It is an encrypted signal that is encrypted by a signal, which is always a different signal, and has the advantage of enhancing security. Further, according to the present invention, since it is not necessary to manage the device to be detected (key device) and the detection device (lock device) in pairs, there is an advantage that efficient management and distribution can be performed.

[Brief description of the drawings]

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

FIG. 2 is a diagram for describing the present invention.

FIG. 3 is a diagram for explanation of the present invention.

FIG. 4 is a configuration diagram showing another embodiment of the identification signal matching device of the present invention.

FIG. 5 is a diagram for explaining FIG. 4;

FIG. 6 is a configuration diagram showing another embodiment of the identification signal matching device of the present invention.

FIG. 7 is a diagram for explaining FIG. 6;

[Explanation of symbols]

Reference Signs List 1 key device, 2 switch unit, 3,12 signal processing circuit unit, 4,11 infrared transmission / reception unit, 5,13 memory unit, 10 lock device, 14 random number generation unit, 15 drive unit

Claims (12)

[Claims] A detection target device having a first wireless transmission / reception unit, a first signal processing unit, and a first memory unit for storing an identification signal; a second wireless transmission / reception unit; a second signal processing unit; A detection device having a second memory unit for storing an identification signal and a random number generation unit, wherein when the detection device receives a response request signal from the device to be detected, Is transmitted, and when the detected device receives the random number signal, the first random number signal is used by using the random number signal.
Encrypting the identification signal stored in the memory unit of the device, transmitting the encrypted identification signal to the detection device, and decrypting the encrypted identification signal in the detection device; An identification signal matching device, wherein whether or not the identification signal matches the identification signal stored in the second memory unit is checked. 2. The identification signal matching device according to claim 1, wherein the encryption of the identification signal performed using the random number signal is performed by a predetermined function. . 3. The identification signal matching device according to claim 2, wherein a plurality of said identification signals are stored in said first memory unit and said second memory unit, respectively, corresponding to said random number signal, and said random number signal is stored in said first memory unit and said second memory unit. An identification signal collating device characterized in that an identification signal to be encrypted is made different according to the identification signal. 4. The identification signal matching device according to claim 2, wherein a plurality of said functions are provided corresponding to said random number signal, and a function used for encryption is different according to said random number signal. Identification signal collating device. 5. The identification signal matching device according to claim 1, wherein said first and second wireless transmission / reception units are each an infrared transmission / reception unit. 6. A device to be detected having a first wireless transmission / reception unit, a first signal processing unit, and a first memory unit for storing an identification signal, a second wireless transmission / reception unit, and a second signal processing unit A detection device having a second memory unit for storing an identification signal and a random number generation unit, wherein a response request signal is transmitted from the detected device, and then the response device receives the response request signal. Transmitting a random number signal from the random number generation unit from the detection device, and then when the device to be detected receives the random number signal, the random number signal is stored in the first memory unit using the random number signal. Encrypting the identification signal, and then transmitting the encrypted identification signal to the detection device, and then decrypting the encrypted identification signal at the detection device, wherein the decrypted identification signal is transmitted to the second device; The identification signal stored in the memory Identification signal checking method which is characterized in that so as to match if it matches the. 7. The identification signal matching method according to claim 6, wherein the encryption of the identification signal performed using the random number signal is performed by a predetermined function. . 8. The identification signal matching method according to claim 7, wherein a plurality of the identification signals are stored in the first memory unit and the second memory unit, respectively, in correspondence with the random number signal, and the random number signal is stored. An identification signal collating method characterized in that an identification signal to be encrypted is made different according to the identification signal. 9. The identification signal collating method according to claim 7, wherein a plurality of said functions are provided corresponding to said random number signal, and a function used for encryption differs according to said random number signal. Identification signal matching method. 10. The identification signal matching method according to claim 6, wherein said first and second wireless transmission / reception units are each an infrared transmission / reception unit. 11. The identification signal matching device according to claim 1, wherein the detected device is a key device, the detection device is a lock device, and the locking device is provided with a locking means and / or an unlocking means. Wherein the locking means and / or the unlocking means are controlled based on a collation output as to whether or not the identification signal decrypted in step (b) matches the identification signal stored in the second memory unit. Signal collation device. 12. The identification signal collating method according to claim 6, wherein the detected device is a key device, the detection device is a lock device, and the locking device is provided with locking means and / or unlocking means. Wherein the locking means and / or the unlocking means are controlled based on a collation output as to whether or not the identification signal decrypted in step (b) matches the identification signal stored in the second memory unit. Signal matching method.