JPH116337A - Light cipher type locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device which cannot be unlocked by unauthorized persons by-making the cipher code more complicated for prohibiting easy decoding and also by making it necessary to have a particular tool for unlocking. SOLUTION: A light radiator 1, light detector 2, memory section 3 and verifying device 4 are provided; a cipher code is prepared by electromagnetic wave adjusted by the wavelength and pulse pattern generated from the light radiator 1 and is made incident to the light detector 2, the wavelength and pulse pattern of the incident light detected by the light detector 2 are verified with the cipher code of the lock stored in the memory section 3, and an unlocking signal is generated when both of them have coincided. The pulse pattern may be determined from the width and interval of the light pulse or an element of light pulse intensity may be incorporated. Moreover, as a light radiator 1, a free electron laser generator may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for unlocking a device based on a complicated optical code using a special device, and more particularly to unlocking the device with a code based on three-dimensional information of the light output of a free electron laser. To a locking device.

[0002]

2. Description of the Related Art It is important that storage places such as safes and storages keep money, securities, jewelry and precious metals, etc. away from others, so that only authorized persons can touch them. As the value of stored articles increases, the locking device for the door becomes more problematic. In addition, it may be provided at the entrance of a room or a building as necessary to prevent outsiders from entering to maintain confidentiality. Lock locking methods have been advanced with the times, such as keys based on the shape of protrusions that have been used for a long time, dial-type and combinations of keys and dials, electronic locks using magnetic patterns, and electronic key devices using computers. It is becoming. An electronic key device using a computer uses an encryption code,
The door cannot be opened unless the code input from the keyboard, magnetic card, or the like matches the code specified in advance.

[0003] However, the conventional projection-shaped key, dial key, magnetic pattern key, and the like, as well known to a key person, a skilled person can create a matching key, a pin or a key. It can be unlocked by a trial and error method using a relatively simple tool such as a stethoscope. Further, even in the case of an electronic key device using a computer, a device in which an encryption code is composed of, for example, a combination of alphanumeric characters, etc., can sometimes be deciphered by a trial and error method using the capabilities of a recent computer. Further, a computer that performs lock management is accessed to search for encryption, or steal an encryption code. Thus, if the encryption is known by any method, there is a problem that anyone can operate the keyboard or the like to unlock the key.

[0004]

The problem to be solved by the present invention is to make the encryption code complicated so that it cannot be easily deciphered, so that anyone other than the authorized person cannot easily release the key. Another object of the present invention is to provide a locking device which requires a specific tool for unlocking, so that a person other than a permitted person cannot unlock the device without permission.

[0005]

In order to solve the above problems, an optical encryption type locking device according to the present invention comprises a light radiator, a photodetector, a storage unit and a collator, and the light radiator uses a wavelength and a pulse pattern. Generates a pulsed light that has been adjusted, makes it incident on the photodetector, detects the wavelength and pulse pattern of the incident light with the photodetector, and verifies it with the encryption code of the target lock stored in the storage unit by the collator Then, a signal for releasing the lock is generated when the two coincide with each other. In addition,
The pulse pattern may be determined based on the width and interval of the light pulse, or may include an element of the light pulse intensity. Further, an optical spectrometer or a monochromator can be used as the photodetector. Further, a free electron laser generator can be used as the light emitter. When a free electron laser is used, a fine hole for guiding the free electron laser can be provided at the detection end of the photodetector.

According to the optical encryption locking device of the present invention, the encryption code is formed by the light specified by the wavelength and the pulse pattern, and the encryption code information becomes one-dimensionally deeper by the wavelength change, so that the decryption becomes extremely difficult. It will be difficult. Further, since it is necessary to use a light radiator capable of designating a wavelength and a pulse pattern for unlocking, it is extremely difficult to open the lock using a readily available substitute. In the case where the pulse pattern is defined by the change in the direction of the time axis, the number of change patterns can be relatively easily increased, so that decoding by trial and error becomes even more difficult. Furthermore, adding light intensity to the pattern formation factor is the same as increasing the degree of freedom of encryption by one dimension, so that decryption becomes more difficult.

[0007] When a free electron laser generator is used as the light radiator of the optical encryption locking device of the present invention, compared with the case where a color filter, a light emitting diode, or another type of laser generator is used, the electromagnetic wave of the electromagnetic wave can be reduced. Since the wavelength can be freely selected, the encryption structure becomes complicated and decryption becomes difficult. Furthermore, since only the free electron laser device can perform such free wavelength selection, other substitutes are not useful for unlocking, and the free electron laser device must be prepared. It is extremely difficult to operate in a state that is not recognized by the user, and security and confidentiality can be easily maintained.

In the case where the light introducing hole reaching the detection end of the photodetector is formed to have a very small diameter, the light intensity of the encryption code is set to a predetermined value or more, and the light reaches the photodetector in an ordinary lighting device. Since the amount of light is insufficient, the locking device can be configured so as not to react unless the device is a free electron laser device. In addition, if you bend the light introduction hole to the hand of the key,
Even if environmental light having various wavelength components is incident, it is difficult to reach the detection end of the photodetector, and the photodetector is insensitive unless light is intentionally incident using a free electron laser device. be able to.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an optical encryption locking device according to the present invention.
FIG. 1 is a block diagram showing one embodiment of the optical encryption locking device of the present invention. The optical encryption locking device in the present embodiment is:
A light radiator 1 is provided as a key, and a lock side is provided with a light detector 2 and a logic circuit 3 having a storage device 4. A thin light guide 5 is provided at the input end of the photodetector 2. The light guide path is a fine hole opened perpendicularly to the wall. The light guide path is bent once in the middle in the middle, and a reflecting mirror 6 for guiding incident light along the hole is provided at this deflection position.

The light radiator 1 is a free electron laser device that emits an electromagnetic wave having a predetermined wavelength for a predetermined time length at a predetermined time timing. As a free electron laser device, a device using a linear accelerator or a device using a storage ring has been put to practical use. FIG. 2 is a configuration diagram showing a main part of a free electron laser device using a linear accelerator. As shown in FIG. 2, the free electron laser device guides an electron beam having a relativistic velocity periodically supplied from an electron accelerator 11 to an undulator 13 which deflects the orbit by a bending electromagnet 12 to generate an alternating magnetic field. Here, by meandering here, synchrotron radiation is generated, and this radiation is resonated between the total reflection mirror 14 and the output mirror 15 while interfering with the periodically supplied spherical electron beam. Generates laser light with strong monochromaticity. The electron beam after passing through the undulator 13 is deflected in its trajectory by the deflection electromagnet 16 and collides with the damper 17 to be extinguished. In the free electron laser device, the wavelength of the generated free electron laser light (FEL) can be freely selected from ultraviolet to far infrared within the constraints of the device by changing the energy of the electron beam or the magnetic field strength of the undulator. It is possible to generate light of different wavelengths by switching appropriately.

When the light radiator 1 is applied to the entrance of the light guide 5 and the light radiator 1 is operated, the thin free electron laser radiated from the light radiator 1 in accordance with the designated sequence enters the thin light guide 5 and is reflected by the reflecting mirror. The light is vertically reflected at 6 and reaches the detection end of the photodetector 2. Since the light beam is a laser beam, it does not spread while traveling along the long light guide path 5 and is measured by the photodetector 2 as sufficiently strong light. The photodetector 2 is an optical detector such as a monochromator or an optical spectrometer, and measures the wavelength and intensity of incident light or the presence or absence of incidence.

FIG. 3 is a graph showing an example of an optical encryption code used in the optical encryption locking device of the present embodiment. In the figure, the horizontal axis represents time in an arbitrary unit, and the vertical axis represents light intensity in an arbitrary unit, and represents a sequence of an optical encryption code. FIG. 3 shows an example in which light intensity and wavelength are used as encryption. The wavelength of the electromagnetic wave is changed in a predetermined order for each lock, and the intensity is set to a predetermined value for each electromagnetic wave wavelength. Although only one example is shown in FIG. 3, an infrared ray of 2.65 μm is first radiated at an intensity of 6 and then an infrared ray of 6.78 μm is radiated at an intensity of 4 and further 12.0 μm. It is cipherized to emit infrared rays at an intensity of 7, further emit 2.95 μm infrared rays at an intensity of 3, and finally emit 7.8 μm infrared rays at an intensity of 1 unit.

This pattern is stored in the storage device 4 as an encryption code corresponding to the target keyhole, and the logic circuit 3 receiving the number information of the target keyhole and the output of the photodetector 2 stores the pattern in the storage device 4. The encrypted code corresponding to the stored keyhole is read and collated. The logic circuit 3 is a device capable of performing a logical operation, such as a computer or a sequencer, and outputs a signal for instructing unlocking when it is determined that the two match as a result of the above-mentioned comparison. Although not shown, a lock mechanism such as a magnet type or a mechanical type that opens and closes and locks the door is provided on the lock side, and holds the closed door in a closed state. When the unlock signal is received, the door is unlocked for the first time.

If the number of attempts exceeds the set number of times that allows a malfunction when the collation results do not match, it is considered that an access other than the authorized person has been made, so that the lock of the lock is maintained and an alarm is issued. . In this embodiment, since the wavelength of the electromagnetic wave is used as a cryptographic element, a tool capable of generating light of a plurality of wavelengths described above is required to operate the locking device, and for this purpose, the free electron laser device must be operated. No. Therefore, it is very difficult for anyone other than the authorized person to open the lock.

FIG. 4 is a graph showing another example of the optical encryption code used in the present embodiment. In the example of the optical encryption code shown in FIG. 4, the encryption is performed by adding a combination of the incident time and the cutoff time of the light in addition to the intensity and the wavelength of the light. In the example shown in the figure, an electromagnetic wave having an intensity of 6.76 μm is radiated at an intensity of 6 for 1 unit time, and after a pause of 2 unit times, an electromagnetic wave having an intensity of 4.62 μm is obtained.
Is radiated for 1 unit time, and further suspended for 3 unit times, and then radiated 5.76 μm electromagnetic wave having an intensity of 6 for 2 unit times. In the optical encryption code of FIG.
Since the pulse width and pulse interval of the electromagnetic wave are added to form a cryptographic element, the dimension of the information structure constituting the cryptography is increased,
Analysis becomes difficult and safety is improved. Further, even if the room for selection of the wavelength of the electromagnetic wave is reduced, the degree of difficulty in decoding does not decrease. Therefore, even if the configuration of the light radiator 1 is simplified, the safety performance does not decrease.

In the above embodiment, it is possible to generate a wavelength that cannot be obtained with a conventional light source, to easily select the wavelength, and to use a narrow light guide path due to the fineness of the generated laser beam. A free electron laser device was used because it has features such as the ability to improve selectivity, and is extremely safe because it cannot be easily replaced with another device. However, even if another light source device is used, the advantage that the decryption of the code becomes difficult by using the wavelength of the electromagnetic wave as the encryption element in the present invention can be enjoyed. That is, light-emitting diodes of different colors may be used in combination to form an optical encryption code by these operation sequences, or a key may be formed by combining a dye laser or some lasers.

[0017]

As described above in detail, the optical encryption type locking device of the present invention makes the key an optical encryption type and incorporates the wavelength into the encryption element, thereby complicating the encryption code so that it cannot be easily decrypted. Thus, the safety of the locking device can be improved. Also, especially when the free electron laser device is used as a key, the locking device cannot be operated by using a substitute, so that the danger of unlocking by anyone other than the authorized person can be effectively avoided. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of an optical encryption locking device of the present invention.

FIG. 2 is a block diagram illustrating an example of a free electron laser device used in the present embodiment.

FIG. 3 is a graph showing an example of an optical encryption code used in the embodiment.

FIG. 4 is a graph showing another example of the optical encryption code used in the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitter 2 light detector 3 logic circuit 4 storage device 5 light guide 6 reflecting mirror 11 electron accelerator 12, 16 deflection electromagnet 13 undulator 14 total reflecting mirror 15 output mirror 17 damper

Claims (6)

[Claims] 1. A light radiator for generating an electromagnetic wave whose wavelength and pulse pattern are adjusted, a photodetector capable of distinguishing a wavelength of an electromagnetic wave incident from the light radiator, and a wavelength designated in advance for each lock as an encryption code. A storage unit storing a pulse pattern, and a signal for unlocking the target lock when the characteristic of the incident electromagnetic wave detected by the photodetector matches an encryption code corresponding to the target lock stored in the storage unit. An optical encryption-type locking device having a collator generated. 2. The optical encryption locking device according to claim 1, wherein the pulse pattern is determined by a pulse width and a pulse interval. 3. The optical encryption locking device according to claim 1, wherein the pulse pattern includes an element of the intensity of the electromagnetic wave. 4. The optical encryption locking device according to claim 1, wherein the photodetector is an optical spectrometer or a monochromator. 5. The optical encryption locking device according to claim 1, wherein the light emitter is a free electron laser generator. 6. The optical encryption-type locking device according to claim 5, further comprising a hole for guiding a free electron laser to a detection end of the photodetector.