KR20170045095A - Method and apparatus for encrypted communication using scatterer - Google Patents

Abstract

The present invention relates to an encrypted communication apparatus using a scatterer and a method thereof, and more particularly, to an encrypted communication apparatus using a scatterer, using a feature of a wave scattered by the scatterer as an encryption key between a transmitting apparatus and a receiving apparatus, and a method thereof. Accordingly, the present invention relates to the encrypted communication apparatus which includes a source unit which generates the wave and transmits the wave to the outside, a modulation unit which modulates a temporal and spatial phase of the wave, and a scattering unit which is composed of at least one scatterer which scatters the wave modulated by the modulation unit according to a scattering pattern and transmits the scattered wave to the receiving apparatus, wherein the scattering pattern is previously shared with the receiving apparatus, and the method thereof. Therefore, the present invention easily can perform an encryption operation with complexity of a high level by using the scatterer with low costs.

Description

[0001] The present invention relates to an encryption communication apparatus using a scatterer,

More particularly, the present invention relates to a cryptographic communication apparatus and a cryptographic communication apparatus using a scatterer that uses the characteristics of waves scattered by a scatterer as a cryptographic key between a transmitting apparatus and a receiving apparatus, It is about the method.

The wavefront control technology started from adaptive optics applied to compensate for the atmospheric distortion of the entire signal in a radio telescope for astronomical observations. The wavefront control technique is also related to a sound field control technique for shaping the sound field distribution of a sound wave.

However, the conventional wavefront control technology has only studied the scattering medium (sound field control) to treat the scattering property of the scattering medium (scattering body, scattering medium) as an object to overcome (adaptive optics) We did not use the scattering medium as the main mediator.

The technology which actively uses the scatterer as a key mediator of technology development has developed into a turning point of scatterer optics that emerged since 2007. In the scattering body optics, when the wave is scattered intricately in the scattering body, but the absorption loss due to the substance other than the scattering body is small, the desired wavefront distribution is obtained on the emitting face by properly adjusting the phase distribution of the incident wave to the scattering body It is a technology that takes advantage of the fact that it can be.

One example where scattering body optics is applied is that the human body acts as a scattering body. Although the human body over-scatters visible light, the loss of visible light in the human body is insignificant, and if the phase distribution of the incident wave to the human body is adjusted, visible light can be collected at one point in the human body.

However, there is still a lack of research on techniques that efficiently utilize scatterer characteristics in various fields.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a scattering device in which a predetermined scattering body is disposed between a transmitting apparatus and a receiving apparatus, and a scattering state in which a wavefront distribution state of an emitting wave scattered by a scattering body is used as a cryptographic key And a method thereof.

According to another aspect of the present invention, there is provided an encryption communication apparatus including a source unit for generating a wave and transmitting the wave to the outside, a modulator for modifying a temporal and spatial phase of the wave, And a scattering unit configured to transmit the scattered wave to a receiving apparatus, wherein the scattering pattern is shared in advance with the receiving apparatus.

Wherein the at least one scatterer comprises any material that modifies at least one of the spatial, temporal, and amplitude of the modulated wave in accordance with the scatter pattern and has a low absorption rate of the modulated wave, And increasing the complexity of the modulated wave passing through the sieve, thereby encrypting the modulated wave.

And the modulator modulates the wave in response to arbitrary transmission / reception data.

The arbitrary transmission / reception data is authentication information that is pre-shared with the receiving apparatus.

In this case, the scattering pattern is shared in advance in order to verify whether the scattered wave corresponds to the authentication information.

The modulator may include a plurality of phase modulators, and the scatterer may include a scatterer having the same or a smaller number of scattering patterns than the number of the phase modulators.

According to another aspect of the present invention, there is provided an encryption communication apparatus including a scattering unit for scattering waves received from outside, and a receiver for processing waves received from the transmitter through the scattering unit, , The scattering pattern of the scattering unit of the transmitting apparatus is shared in advance with the transmitting apparatus, and the received wave is processed in accordance with the scattering pattern.

And the received wave is a wave scattered according to the scattering pattern by at least one scatterer constituting a scatterer of the transmitting apparatus.

And the received wave is a scattered wave corresponding to arbitrary transmission / reception data.

And the arbitrary transmission / reception data is authentication information that is pre-shared with the transmission apparatus.

In this case, the receiving unit verifies whether the received wave corresponds to the authentication information using the scattering pattern.

In this case, the receiving unit determines that authentication of the transmitting apparatus is successful if the wave scattered by using the scattering pattern and the received wave correspond to the authentication information.

In this case, the receiving unit determines that authentication of the transmitting apparatus is successful if the wave scattered by using the scattering pattern and the received wave correspond to the authentication information.

The scattering portion is characterized in that it includes a plurality of scattering bodies having different scattering patterns.

According to another aspect of the present invention, there is provided an encryption communication method for an encrypted communication device including at least one scatterer, the method comprising: sharing a scattering pattern for the at least one scatterer with another device; Modulating the generated wave in accordance with the arbitrary data when the data is transmitted, and transmitting the modulated wave by scattering the modulated wave according to the scattering pattern.

When receiving the data, processing the received wave according to the scattering pattern.

And the data is authentication information that is pre-shared with the other device.

Wherein the step of processing the received waves comprises the steps of acquiring the waves in which the authentication information is scattered according to the scattering pattern, determining whether the obtained waves correspond to the received waves, And judging that the authentication of the other device is successful if the received wave corresponds to the received wave.

The processing of the received waves may further include scattering the received waves according to an arbitrary scattering pattern.

The cryptographic communication apparatus and method using the scatterer according to the present invention can easily perform encryption with a high level of complexity using a low-cost scattering body.

In addition, the encryption communication apparatus and method using the scatterer according to the present invention can be applied together with a conventional encryption communication method implemented in hardware or software, thereby providing stability in addition to stability of the existing encryption communication method .

1 to 4 are diagrams illustrating a system in which an encryption communication device according to the present invention operates.
5 is a flowchart illustrating an encryption communication method according to the present invention.

In the description of the embodiments of the present invention, if it is determined that a detailed description of known configurations or functions related to the present invention can not be applied to the present invention, detailed description thereof may be omitted.

Quot ;, " include, "" include," as used herein. And the like are intended to indicate the presence of disclosed features, operations, components, etc., and are not intended to limit the invention in any way. Also, in this specification, "include." Or "have." , Etc. are intended to designate the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, may be combined with one or more other features, steps, operations, components, It should be understood that they do not preclude the presence or addition of combinations thereof.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

The present invention utilizes the fact that a scattering pattern of a wave passing through a scattering body forms a random distribution temporally and spatially. By using a scattering pattern, it is possible to obtain a relatively simple To an apparatus and a method for generating various cipher codes ranging from a cipher code to a very complex cipher code and performing encryption communication using the cipher court.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 to 4 are diagrams illustrating a system in which an encryption communication device according to the present invention operates.

Referring to FIG. 1, an encrypted communication device according to the present invention may operate as a transmitting device 10 or a receiving device 20 in a system. However, the transmitting apparatus 10 and the receiving apparatus 20 of FIG. 1 are classified to facilitate the description of the encryption communication method according to the present invention, and the encryption apparatus according to the present invention does not operate as any one apparatus , And may act as a transceiver for performing the cryptographic communication method according to the present invention.

A transmitting apparatus (10) according to the present invention includes an encrypting communication apparatus (11), a modulating unit (12), and a scattering unit (13).

The source portion 11 generates a wave and transmits it to the outside. The source unit 11 generates electromagnetic waves or sound waves of various wavelengths and transmits them to the modulator 12. In various embodiments of the present invention, the waves may be generated by a radio frequency (RF), a millimeter wave (MMW), a terahertz wave (T-ray), an infrared ray (IR) and includes various physical waves such as electromagnetic waves, sound waves, and ultrasonic waves in all bands including visible light, ultraviolet ray (UV), and X-ray.

The modulating unit 12 modifies the temporal and spatial phases of the wave incident from the source unit 11 and transmits the modulated wave to the scattering unit 13.

In one embodiment, the modulator 12 can modify the phase of the wave by passing or reflecting the incident wave to a phase modulator. In another embodiment, when the wave travels the waveguide, the modulator 12 can change the phase of the wave without direct contact between the wave and the phase modulator by changing the physical properties around the waveguide.

The wave modulated by the modulation section 12 may include arbitrary transmission / reception information (data). In one embodiment, the modulated wave may be pre-shared authentication information that is mutually verifiable between the transmitting device 10 and the receiving device 20. Alternatively, in one embodiment, the modulated wave may be image information that the transmitting device 10 intends to transmit to the receiving device 20. [

The scattering unit 13 may include at least one scattering medium (scattering medium) for scattering the incident wave modulated by the modulating unit 12. [ The scattering body constituting the scattering unit 13 can be configured to change at least one of the phase and the amplitude of the wave to change the at least one of the phase and amplitude of the wave so that any complexity ≪ / RTI > That is, the scatterer may play a role of modulating waves by modifying at least one of spatial, temporal phase, frequency, and amplitude of the waves.

To this end, the scatterer is a physical medium that imparts complexity by scattering the modulated waves, and may be formed of a material capable of modifying at least one of the phase and the amplitude of the waves. That is, the scattering body can be composed of any material capable of providing sufficient complexity to the wave due to high scattering degree to the wave, and minimizing energy loss due to low wave absorption rate. Scatterers include any material that scatters waves in the form of transmission, reflection, diffusion, or concentration, or scatters waves by electrical, magnetic, mechanical, or chemical stimuli. In various embodiments of the present invention, the scatterer may consist of a single type of material, or may be composed of a mixture of two or more different materials.

The waves incident on the scattering portion 13 pass through the scattering body or are reflected from the scattering body, and their characteristics are changed by directly interacting with the scattering body. Alternatively, the wave incident on the scattering section 13 may directly change its characteristics indirectly by the physical environment around the path, instead of directly interacting with the scattering body.

In various embodiments of the present invention, the scattering unit 13 may include scatterers that generate scattering due to inter-mode interference in a waveguide in which multiple modes may exist, scattering due to local feedback, and the like.

The change in the characteristic of the wave caused by the passage of the scattering portion 13 is determined by the characteristics of the scattering body, specifically, the scattering pattern of the scattering body. Therefore, when the transmitting apparatus 10 and the receiving apparatus 20 share the scattering pattern of the scatterer in advance, the receiving apparatus 20 can receive the signal transmitted through the scattering section 13 as a scattering pattern that has been previously shared By demodulating, the original modulated wave can be obtained, and the transmission / reception information included in the modulated wave can be confirmed.

As described above, since the scattering pattern of the scatterer constituting the scatterer 13 has a very high complexity, the third person, who does not know the scattering pattern of the scatterer, The original information can not be derived. Even if the third person who does not know the scattering pattern modifies the characteristics of the wave, the transmitting apparatus 10 and the receiving apparatus 20 can easily recognize this. As a result, the scattering body of the present invention is used as a cryptographic key between the transmitting apparatus 10 and the receiving apparatus 20, and the communication method using the scattering body can perform encrypted communication between the transmitting apparatus 10 and the receiving apparatus 20 .

In the various embodiments of the present invention, when the transmitting apparatus 10 and the receiving apparatus 20 share the authentication information in advance, the communication method using the scattering body is a method in which the transmitting apparatus 10 and the receiving apparatus 20 communicate with each other And can be used for verification. Specifically, the receiving apparatus 20 obtains the encrypted authentication information by applying the scattering pattern of the scatterer to the modulated wave including the authentication information previously shared with the transmitting apparatus 10. If the characteristic of the wave of the encrypted authentication information corresponds to the characteristic of the wave received from the transmitting apparatus 10, the receiving apparatus 20 can determine that communication with the verifying transmitting apparatus 10 is being performed.

If a phase modulator with 100 × 100 cells can modulate the phase per cell by 10 steps, the phase combination of the waves modulated by this phase modulator is 10 ^ 10000. Therefore, the transmitting apparatus 10 and the receiving apparatus 20 performing encryption communication according to the present invention using previously shared information can be assured of high security.

The waves scattered through the scattering portion 13 travel through the waveguide, the medium, the free space, and are received by the reception device 20.

The cryptographic communication apparatus as the receiving apparatus 20 according to the present invention comprises a scattering unit 21 and a receiving unit (detecting unit)

The scattering section 21 may include at least one scattering body (scattering medium) for scattering the waves received from the transmitting apparatus 10. [ The scatterer constituting the scattering section 21 can be made of any material capable of imparting a high degree of complexity to the wave by modifying at least one of the characteristics of the phase and the amplitude of the received wave.

The scattering body of the scattering unit 21 provided in the receiving apparatus 20 is the same as that of the scattering unit 13 of the transmitting apparatus 10, and a detailed description thereof will be omitted.

1, the receiving apparatus 20 includes the scattering unit 21, which is only one embodiment. In the receiver 20, the scattering unit 21 may not be provided. have. Or, in one embodiment, the scattering section 13 of the transmission apparatus 10 and the scattering section 21 of the reception apparatus 20 may be integrally provided.

The receiving unit 22 processes the received wave using a scattering pattern previously shared with the transmitting apparatus 10. [ For example, the receiving unit 22 extracts the characteristics of the received waves and extracts the transmission / reception information included in the waves by using the scattering pattern of the shared scatterer or by verifying the transmitting apparatus 10, Operation can be performed.

In one embodiment, the receiving unit 22 can acquire the modulated wave by the original transmitting apparatus 10 by demodulating the received wave with a previously shared scattering pattern, and transmit and receive the transmitting / receiving information included in the modulated wave Can be confirmed.

Further, in one embodiment, the receiving unit 22 applies the scattering pattern of the scatterer to the modulated wave including the authentication information previously shared with the transmitting apparatus 10 to obtain the encrypted authentication information. When the characteristic of the wave of the encrypted authentication information corresponds to the characteristic of the received wave, the receiving unit 22 can determine that communication with the verified transmitting apparatus 10 is being performed.

On the other hand, in various embodiments of the present invention, when the cryptographic communication device operates as both the transmitting device 10 and the receiving device 20, that is, when the cryptographic communication device is implemented as a transceiver, (11) and a receiver (22).

The encryption communication method according to the present invention can be applied not only to point-to-point communication as shown in FIG. 1 but also to point-to-point (one-to-many), multi-point (multi-point 1) and multi-point communication. Figures 2-4 illustrate this extended embodiment of the present invention.

2, the receiving apparatus 201 includes a plurality of receiving units 221-1 to 221-3 for point-to-multipoint communication.

2, the receiving apparatus 201 may include a plurality of scattering units 211-1 to 211-3 corresponding to the receiving units 221-1 to 221-3, respectively.

Alternatively, in another embodiment, the receiving apparatus 201 may be configured with a smaller number of scattering sections than the plurality of receiving sections 221-1 to 221-3. In this case, the scattering characteristics Time, and frequency differently to at least a part of the plurality of receiving units 221-1 to 221-3 so that the plurality of receiving units 221-1 to 221-3 have different scattering characteristics, that is, The encryption key can be used.

3, the transmitting apparatus 102 includes a plurality of modulators 122-1 to 122-3 for multi-point communication.

In the embodiment of FIG. 3, the transmitting apparatus 102 may be configured to include a plurality of scattering sections 132-1 through 132-3 corresponding to the respective modulation sections 122-1 through 122-3.

Alternatively, in another embodiment, the transmitting apparatus 102 may be configured with a smaller number of scattering sections than the plurality of modulation sections 122-1 to 122-3, in which case scattering of the scattering body for any scattering section The characteristic is assigned to at least a part of the plurality of modulation sections 122-1 to 122-3 differently in terms of space, time, and frequency, so that the plurality of modulation sections 122-1 to 122-3 have different scattering characteristics, That is, different encryption keys can be used.

4, the transmitting apparatus 103 and the receiving apparatus 203 include a plurality of modulating units 123-1 to 123-3 and a plurality of receiving units 223-1 to 223-3, respectively, for multi- .

In the embodiment of FIG. 4, the transmitting apparatus 103 may be configured to include a plurality of scattering sections 133-1 to 133-3 corresponding to the respective modulation sections 123-1 to 123-3. 4, the receiving apparatus 203 may be configured to include a plurality of scattering sections 213-1 to 213-3 corresponding to the respective receiving sections 223-1 to 223-3 .

Alternatively, in another embodiment, the transmitting apparatus 103 and the receiving apparatus 203 may have a plurality of modulating units 123-1 to 123-3 and a plurality of receiving units 223-1 to 223-3, respectively, In this case, the scattering characteristics of the scattering body with respect to any scattering unit may be composed of a plurality of modulating units 123-1 to 123-3 and at least one of the plurality of receiving units 223-1 to 223-3 And can be allocated to some parts differently in terms of space, time, and frequency.

As described above, in the present invention, at least one scatterer is disposed on the path from the transmitter 10 to the receiver 20, so that the waves generated by the transmitter 10 are scattered by the scatterer, To be transmitted to the receiving apparatus 20 in a state in which the receiving apparatus 20 has been given. The present invention makes it possible to perform encrypted communication between the transmitting apparatus 10 and the receiving apparatus 20 by using the scattering characteristic of the scattering body as a cryptographic key shared in advance between the transmitting apparatus 10 and the receiving apparatus 20. [

The encryption communication method according to the present invention can be used not only as a backbone network but also as a means for physically securing a secure connection under the IoT environment.

5 is a flowchart illustrating an encryption communication method according to the present invention.

Referring to FIG. 5, the cryptographic communication apparatus according to the present invention first shares information about scattering patterns of at least one other cryptographic communication apparatus with scatterers (501). Wherein the at least one other encrypted communication device may be another transmitting device, a receiving device, or a transceiver device.

The information about the scattering pattern of the scatterer includes information about a scattering pattern for at least one scatterer existing on the path between the encrypted communication device and the other encrypted communication device. The information on the scattering pattern may include information about a change in characteristics of the waves as they pass through the scattering body, for example, at least one of the phase and the amplitude of the waves.

In various embodiments of the present invention, the cryptographic communication device may share authentication information for verifying with the at least one other cryptographic communication device.

Next, the encrypted communication device determines whether to transmit the information (502).

When the cryptographic communication device is operating as a transmitting device, the cryptographic communication device modulates the wave generated in the source part after determining to transmit the information (503). The encryption communication apparatus can modulate the phase of the wave generated at the source unit to correspond to the information to be transmitted.

In one embodiment of the present invention, the cryptographic communication device may modulate the phase of the wave in response to authentication information previously shared with another cryptographic communication device.

Next, the cryptographic communication device transmits the modulated wave to the scatterer to scatter the wave (504). The waves scattered by the scattering body are deformed in accordance with the scattering pattern of the scattering body. In other words, the wave scattered by the scatterer is encrypted by the scattering pattern of the scatterer, that is, the encryption key according to the present invention. The encrypted wave may be transmitted to the at least one encrypted communication device through the free space.

When the cryptographic communication device is operating as a receiving device, the cryptographic communication device decides not to transmit the information, and then receives any waves (505). In one embodiment of the present invention, the received wave is a wave that has passed through a scattering body constituting at least one of a transmitting apparatus and a receiving apparatus.

If an arbitrary wave is received, the cryptographic communication device processes the received wave using information about a previously shared scatter pattern (506). For example, the cryptographic communication device extracts characteristics of a received wave to verify another cryptographic communication device, or extracts transmission / reception information included in a wave using a scattering pattern of a shared scatterer to perform an operation required for encryption communication Can be performed.

In one embodiment, the cryptographic communication device can obtain the original modulated wave by demodulating the received wave with a previously shared scattering pattern, and can identify the transmission / reception information included in the modulated wave.

In addition, in one embodiment, the cryptographic communication device applies the scattering pattern of the scatterer to the modulated wave including the previously shared authentication information to obtain the encrypted authentication information. When the characteristic of the wave of the encrypted authentication information corresponds to the characteristic of the received wave, the encrypted communication device determines that the verification of the other encrypted communication device is successful, and can continue the encrypted communication with the encrypted communication device.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

10: Transmitter
11: source part
12: Modulation section
13: spawning part
20: Receiver
21: spawning part
22: Receiver

Claims (20)

A source part for generating a wave and delivering it to the outside;
A modulator for modifying the temporal and spatial phases of the waves; And
And a scattering unit configured of at least one scattering body for scattering the modulated wave according to a scattering pattern, the scattering unit transmitting the scattered wave to a receiver,
The scattering pattern,
And is shared in advance with the receiving apparatus. The method of claim 1, wherein the at least one scatterer comprises:
Modulating at least one of the spatial, temporal, and amplitude of the modulated wave in accordance with the scattering pattern, the modulated wave being of any material having a low absorption rate of the modulated wave, To thereby increase the complexity of the modulated wave, thereby encrypting the modulated wave. The apparatus as claimed in claim 1,
And modulates the wave in response to arbitrary transmission / reception data. 4. The apparatus according to claim 3, wherein the arbitrary transmission /
And the authentication information is pre-shared with the receiving device. 5. The method of claim 4,
Wherein the receiving device is shared in advance to verify whether the scattered wave corresponds to the authentication information. The apparatus as claimed in claim 1,
And a plurality of phase modulators,
The scattering portion
And a scattering body having a different scattering pattern, the number of which is equal to or smaller than the number of the phase modulators. A scattering unit for scattering waves received from the outside; And
And a receiving unit for processing waves received from the transmitting apparatus through the scattering unit,
The receiver may further comprise:
Wherein the scattering pattern of the scattering unit of the transmitting apparatus is shared in advance with the transmitting apparatus, and the received wave is processed in accordance with the scattering pattern. 8. The method of claim 7,
Wherein the scattered wave is a wave scattered according to the scattering pattern by at least one scattering body constituting a scattering unit of the transmission apparatus. 9. The apparatus of claim 8, wherein the at least one scatterer comprises:
Wherein at least one of the spatial and temporal phases and amplitudes of the modulated wave in the transmitting device is deformed according to the scattering pattern and the absorption rate of the modulated wave is low, And encrypting the modulated wave by increasing the complexity of the modulated wave. 8. The method of claim 7,
And the scattered wave corresponding to arbitrary transmission / reception data. 11. The method according to claim 10, wherein the arbitrary transmission /
The authentication information being pre-shared with the transmitting apparatus. 12. The apparatus of claim 11,
And verifies whether or not the received wave corresponds to the authentication information by using the scattering pattern. 13. The apparatus of claim 12,
And determines that authentication of the transmitting apparatus is successful when the wave scattered by using the scattering pattern and the received wave correspond to the authentication information. 8. The apparatus according to claim 7,
And a plurality of scatterers having different scattering patterns. CLAIMS 1. An encryption communication method for an encryption communication device including at least one scatterer,
Sharing a scattering pattern for the at least one scatterer with another device;
Modulating the generated waves corresponding to the data when transmitting the data; And
And scattering the modulated wave according to the scattering pattern and transmitting the scattered wave. 16. The apparatus of claim 15, wherein the at least one scatterer comprises:
Modulating at least one of the spatial, temporal, and amplitude of the modulated wave in accordance with the scattering pattern, the modulated wave being of any material having a low absorption rate of the modulated wave, Wherein the modulated wave is encrypted by increasing the complexity of the modulated wave. 16. The method of claim 15,
Further comprising processing the received wave in accordance with the scattering pattern when receiving the data. 18. The method of claim 17,
And the authentication information is pre-shared with the other device. 19. The method of claim 18, wherein processing the received wave comprises:
Acquiring a wave generated by scattering the authentication information according to the scattering pattern;
Determining whether the obtained wave corresponds to the received wave; And
And determining that the authentication of the other device is successful if the obtained wave corresponds to the received wave. 18. The method of claim 17, wherein processing the received waves comprises:
And scattering the received waves according to an arbitrary scattering pattern.

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