CN113810126A - A Dynamic Security Encryption Method for Diffraction-Free Vortex Electromagnetic Wave Channel Characteristics - Google Patents

Abstract

The invention provides a dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics, and relates to the field of wireless communication. By acquiring the information to be transmitted at the transmitting end; establishing a non-diffraction vortex electromagnetic wave channel according to the non-diffraction vortex beam sent by the transmitting end and the legitimate receiving end; The phase and the modulated symbol vector superposition between the diffractive vortex electromagnetic wave mode wireless channels realize encryption, so that the expected user and the eavesdropper receive different key packets in the key negotiation stage, so that the eavesdropper cannot obtain the normal communication between users. The key between the two is to ensure the safe transmission of data; the non-diffraction vortex electromagnetic wave can be reconstructed after passing through obstacles, and has a certain tolerance for the channel phase error, which can solve the complexity, difficulty and leakage risk of wireless device communication encryption. It can effectively improve the security of communication node communication.

Description

A Dynamic Security Encryption Method for Diffraction-Free Vortex Electromagnetic Wave Channel Characteristics

technical field

The invention relates to the field of wireless communication, in particular to a dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics.

Background technique

In recent years, with the continuous improvement of the data transmission rate supported by the wireless communication system and the continuous expansion of the scale of wireless users, the security of wireless communication has become more and more important. The security of communication has always been an important measure to measure the quality of communication, and wireless network communication puts forward higher requirements for security. In addition, in view of the continuous growth of wireless communication capacity, the mechanism of modulation, multiplexing and demultiplexing of radio frequency vortex beams in the new physical parameter dimension of the diffraction-free vortex electromagnetic wave (Vortex Beam) is studied. It is of great significance for civil or military communication systems to seek new technologies that can be fully utilized to improve the spectral efficiency and capacity of wireless communication systems.

There is an existing Chinese patent, the bulletin number is CN104821875B, which discloses a high-capacity quantum secret sharing method based on photon orbital angular momentum coding, constructs two unitary operators, and gives two complete sets of intrinsic orbital angular momentum , using single-photon orbital angular momentum encoding to improve the communication capacity and spectral efficiency of quantum secret sharing schemes without the need for multi-component entangled photon states. In addition, there is a Chinese patent with the publication number of CN106899970A, which discloses a wireless communication encryption method based on angular momentum. According to the polarization state of the wireless antenna and the channel parameter characteristics of the angular momentum, the antenna polarizations of different polarizations or polarization states are used. The difference caused by the randomness and independence of the state, the non-diffraction vortex electromagnetic wave pattern of different characteristic quantum numbers, the signal strength indication and the bit error rate, realize the cross-layer key negotiation, so that the expected user and the eavesdropper can perform the key negotiation. Different key packages are received at the stage, so that the eavesdropper cannot obtain the key between normal communication users, so as to achieve the purpose of ensuring the safe transmission of data. The disadvantage of the above prior art is that orbital angular momentum is easily annihilated during transmission, and it is difficult for quantum states to be transmitted with fidelity over long distances.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics, to improve the problems in the prior art that orbital angular momentum is easily annihilated during transmission, and quantum states are difficult to transmit with fidelity over long distances.

In a first aspect, an embodiment of the present application provides a dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics, which includes the following steps.

Obtain the information to be transmitted from the sender;

Establish a non-diffraction vortex electromagnetic wave channel according to the non-diffraction vortex beam sent by the sender and the legitimate receiver;

The information to be transmitted is encrypted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel to generate encrypted information.

In the above implementation process, the information to be transmitted at the transmitting end is obtained; then the non-diffraction vortex electromagnetic wave channel is established according to the non-diffraction vortex beam sent by the transmitting end and the legitimate receiving end; finally, the transmission is to be transmitted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel. The information is encrypted to generate encrypted information. By establishing a diffraction-free vortex electromagnetic wave channel, the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used to generate the key technology at the same time, and the physical information such as the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used as The key seed generates a key, generates a corresponding symbol during the modulation process, and uses the key containing the above information to encrypt the transmitted service data, and uses the phase and the modulated symbol vector between the wireless channels of different non-diffraction vortex electromagnetic wave modes. The superposition realizes encryption, improves the security of data transmission on the communication node, and enables the expected user and the eavesdropper to receive different key packages during the key negotiation stage, so that the eavesdropper cannot obtain the key between normal communication users. To ensure the safe transmission of data, the non-diffraction vortex electromagnetic wave can self-recover after passing through obstacles, and the vortex mode and quantum state can be maintained during long-distance transmission. Therefore, in the wireless communication system, the channel physical characteristics of the non-diffraction vortex electromagnetic wave mode are also It determines the randomness and independence of the vortex beam mode characteristic space, so that the two different wireless channels have packet loss differences. And the system has a certain tolerance to the channel phase error. Compared with the currently commonly used physical layer encryption technology, the method of generating the key is simple and the complexity is low, and at the same time, its randomness ensures the security of encryption.

Based on the first aspect, in some embodiments of the present invention, the above-mentioned encrypting the information to be transmitted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel, the step of generating the encrypted information includes the following steps:

Obtain the channel state information in the diffraction-free vortex electromagnetic wave channel;

generating encrypted channel coefficients according to the channel state information;

The encrypted channel coefficient is used as a key symbol to perform vector multiplication and vector superposition with each data symbol point in the information to be transmitted to generate an encrypted transmission symbol;

A check code is added to the encrypted transmission symbol to generate encrypted information.

Based on the first aspect, in some embodiments of the present invention, the above-mentioned data symbol points include modulated symbol points that the transmitting end maps the bit data to on the constellation diagram through modulation.

Based on the first aspect, in some embodiments of the present invention, the above step of acquiring channel state information in a diffraction-free vortex electromagnetic wave channel includes the following steps:

In the same time slot or within the coherence time, the legal receiver and the transmitter send pilots at the same time and respectively to perform channel detection of the uplink and downlink channels. The transmitter obtains the uplink channel coefficients, and the legal receiver obtains the downlink channel coefficients to obtain the channel state. information.

Based on the first aspect, in some embodiments of the present invention, the above-mentioned step of generating an encrypted channel coefficient according to the channel state information includes the following steps;

The uplink transmit channel coefficients and the uplink receive channel coefficients in the uplink channel coefficients of the transmitting end are formed into a first six-dimensional vortex pattern, that is, the encrypted channel coefficients

The downlink transmit channel coefficients and the downlink receive channel coefficients in the downlink channel coefficients of the legal receiving end are formed into a second six-dimensional vortex pattern, that is, the encrypted channel coefficients

Based on the first aspect, in some embodiments of the present invention, the following steps are further included:

The sender sends the encrypted information to the legitimate receiver;

The legitimate receiver uses the key to perform bitwise modulo two encryption and decryption on the encrypted information to generate plaintext information.

Based on the first aspect, in some embodiments of the present invention, the following steps are further included:

The sender and the legitimate receiver send key packets alternately according to time slots.

Based on the first aspect, in some embodiments of the present invention, the above key package includes a key package sent by the sender to a legitimate receiver and a key package sent by the legitimate receiver to the sender.

Based on the first aspect, in some embodiments of the present invention, a channel measurement module, a vortex beam quantization module, a key agreement module, an encryption module, and a data processing module are installed on both the transmitting end and the legitimate receiving end.

In a second aspect, embodiments of the present application provide an electronic device, which includes a memory for storing one or more programs; and a processor. When the above-mentioned one or more programs are executed by the above-mentioned processor, the above-mentioned method according to any one of the above-mentioned first aspects is implemented.

The embodiments of the present invention have at least the following advantages or beneficial effects:

The embodiment of the present invention provides a dynamic security encryption method for the characteristics of a diffraction-free vortex electromagnetic wave channel, by acquiring the information to be transmitted at the sending end; Finally, according to the channel characteristics of the non-diffraction vortex electromagnetic wave channel, the information to be transmitted is encrypted to generate encrypted information. By establishing a diffraction-free vortex electromagnetic wave channel, the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used to generate the key technology at the same time, and the physical information such as the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used as The key seed generates a key, generates a corresponding symbol during the modulation process, and uses the key containing the above information to encrypt the transmitted service data, and uses the phase and the modulated symbol vector between the wireless channels of different non-diffraction vortex electromagnetic wave modes. The superposition realizes encryption, improves the security of data transmission on the communication node, and enables the expected user and the eavesdropper to receive different key packages during the key negotiation stage, so that the eavesdropper cannot obtain the key between normal communication users. To ensure the safe transmission of data, the non-diffraction vortex electromagnetic wave can self-recover after passing through obstacles, and the vortex mode and quantum state can be maintained during long-distance transmission. Therefore, in the wireless communication system, the channel physical characteristics of the non-diffraction vortex electromagnetic wave mode are also It determines the randomness and independence of the vortex beam mode characteristic space, so that the two different wireless channels have packet loss differences. And the system has a certain tolerance to the channel phase error. Compared with the currently commonly used physical layer encryption technology, the method of generating the key is simple and the complexity is low, and at the same time, its randomness ensures the security of encryption.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a flowchart of a dynamic security encryption method for a diffraction-free vortex electromagnetic wave channel feature provided by an embodiment of the present invention;

Fig. 2 is the dynamic security encryption architecture diagram of the channel characteristic of the diffraction-free vortex electromagnetic wave provided by the embodiment of the present invention;

3 is a schematic diagram of a key negotiation process of a dynamic secure encryption method without diffraction vortex electromagnetic wave channel characteristics provided by an embodiment of the present invention;

4 is a schematic structural diagram of the key packet sent by the transmitting end Alice to the legal receiving end Bob in the dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics provided by an embodiment of the present invention;

5 is a schematic structural diagram of a transmitting end Alice and a legitimate receiving end Bob provided by an embodiment of the present invention;

6 is a flowchart of encrypting information to be transmitted according to channel characteristics in a diffraction-free vortex electromagnetic wave channel provided by an embodiment of the present invention;

FIG. 7 is a structural block diagram of an electronic device according to an embodiment of the present invention.

Icons: 1-first channel measurement module; 2-first vortex beam quantization module; 3-first key agreement module; 4-first encryption module; 5-first data processing module; 6-second channel measurement module; 7-second vortex beam quantization module; 8-second key agreement module; 9-second encryption module; 10-second data processing module; 101-memory; 102-processor; 103-communication interface.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Example

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The various embodiments described below and various features of the embodiments may be combined with each other without conflict.

Please refer to FIG. 1 . FIG. 1 is a flowchart of a dynamic security encryption method for a diffraction-free vortex electromagnetic wave channel feature provided by an embodiment of the present invention. A dynamic security encryption architecture without diffraction vortex electromagnetic wave channel characteristics can be constructed, which consists of the sender Alice and the legitimate receiver Bob. The application model of this method is a three-node eavesdropping model, including a sender (Alice), a legitimate receiver (Bob) and an eavesdropper (Eve). As we all know, the sender and the receiver can be either terminal nodes or similar network devices such as gateways. Referring to FIG. 2 , FIG. 2 is a diagram of a dynamic security encryption architecture diagram of a channel characteristic of a diffraction-free vortex electromagnetic wave provided by an embodiment of the present invention. Assume that the normal communication parties are Alice and Bob, and the illegal third party, the eavesdropper, is Eve. The dynamic security encryption method for the channel characteristics of the diffraction-free vortex electromagnetic wave includes the following steps:

Step S110: Acquire the information to be transmitted by the sender; the above information to be transmitted refers to the information to be sent by the sender. The above-mentioned information to be transmitted may be text information, image information, and the like. The above-mentioned sender may be the sender Alice or the legitimate receiver Bob.

Step S120: Establish a non-diffraction vortex electromagnetic wave channel according to the non-diffraction vortex beam sent by the transmitting end and the legitimate receiving end; the above-mentioned transmitting end sends the non-diffraction vortex beam and receives the non-diffraction vortex beam sent by the legal receiving end, and the legal receiving end sends the non-diffractive vortex beam. The non-diffraction vortex beam is sent and the non-diffraction vortex beam sent by the sending end is received, so as to establish a connection through the non-diffraction vortex beam, and form a non-diffraction vortex electromagnetic wave channel. Both the sending end and the legitimate receiving end are provided with a vortex beam quantization module for generating a diffraction-free vortex beam.

Step S130: Encrypt the information to be transmitted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel to generate encrypted information. The above encryption is implemented by using the phase and modulated symbol vector superposition between wireless channels of different non-diffraction vortex electromagnetic wave modes. Referring to FIG. 3 , FIG. 3 is a schematic diagram of a key negotiation process of a dynamic secure encryption method for a diffraction-free vortex electromagnetic wave channel feature provided by an embodiment of the present invention. The communication process between Alice and Bob is divided into four steps: channel estimation process, key negotiation process, key encryption process and data transmission process. Please refer to FIG. 6. FIG. 6 is a flow chart of encrypting information to be transmitted according to channel characteristics in a diffraction-free vortex electromagnetic wave channel provided by an embodiment of the present invention. The above-mentioned encryption process includes the following steps:

First, the channel state information in the non-diffraction vortex electromagnetic wave channel is obtained; the channel estimation is prepared at the beginning of each transmission, and the channel estimation is to obtain the CSI (channel state information) between the transmitting end Alice and the legitimate receiving end Bob. The channel estimation process may be that the transmitting end Alice and the legitimate receiving end Bob send the vortex pattern and receive the other party's vortex pattern in a time slot as close as possible. The above-mentioned acquisition of the channel state information may be in the same time slot or within the coherence time, the legitimate receiver and the transmitter send pilots at the same time and respectively to perform channel detection of the uplink and downlink channels, the transmitter obtains the uplink channel coefficient, and the legitimate receiver obtains the channel state information. Downlink channel coefficients to obtain channel state information. We adopt a channel sounding strategy of sending pilots. Specifically, channel estimation is prepared at the beginning of each transmission. The channel estimation is to obtain the CSI (channel state information) between the sender and the legitimate receiver. The same time slot Within the internal or coherent time, the legitimate receiver Bob and the transmitter Alice simultaneously and respectively send pilot frequencies to perform channel detection of the uplink and downlink channels. The transmitting end Alice obtains the first channel intensity S _A , the first antenna polarization state {|H _A >, |V _A >} and the phase of the first non-diffraction vortex electromagnetic wave mode {-|l _A >, |l _A > } The upstream channel coefficient h _A ; the legal receiver Bob obtains the second channel strength S _B , the second antenna polarization state {|H _B >, | V _B >} and the second diffraction-free vortex electromagnetic wave mode phase {- |l _B >, |l _B >} downlink channel coefficient h _B . Since the channel is changing, the channel estimation is performed again every time slot. It is considered that the channel is relatively stable and the CSI (channel state information) remains unchanged between the two estimations. Only the sender Alice and the legitimate receiver know the estimated instantaneous value. Channel information, the eavesdropping end Eve will not be able to obtain correct CSI (channel state information).

六个涡旋模式生成密钥种子，发送端Alice使用某个涡旋模式密钥种子生成密钥，进行发送数据的加密调制。具体包括以下步骤：Then, the encrypted channel coefficient is generated according to the channel state information; it is assumed that there is no delay when the sender Alice and the legitimate receiver Bob perform uplink and downlink channel detection, and the channel reciprocity criterion is satisfied, so as to generate the next vortex mode combined key generation seed . From the perspective of the sender, the main channel coefficients h _A and h` <sub>B</sub> estimated by the sender and the legitimate receiver are consistent (h represents the sending state, and h` represents the receiving state), and the same is true for the receiving end; assuming that the sending end Alice With S _A =23dB, pilots are sent for different modes (| _HA >=1, |VA >=1, -|l _A >=-3, |l _A > ₌ 3), and the legitimate receiver Bob receives the Channel estimation is performed in the pilot information, and the received vortex pattern is obtained as (|H` <sub>A</sub> >=1, |V` _A >=1, -|l` <sub>A</sub> >=-3, |`l _A >=3), And vice versa, so the channel estimates of both parties can be used as the seed for the next step of vortex mode combination key generation. The legitimate receiver can avoid key sharing through this scheme and realize the exchange of key information with the sender. The above-mentioned generation of encrypted channel coefficients refers to the formation of a six-dimensional vortex pattern from the estimated values of the respective transmit channels and receive channels.

The six vortex modes generate key seeds, and the sender Alice uses a certain vortex mode key seed to generate a key to encrypt and modulate the transmitted data. Specifically include the following steps:

比如发送端Alice的第一六维涡旋模式可以是{S_A，S`<sub>B</sub>}{|H<sub>A</sub>>，|V<sub>A</sub>>，-|l<sub>A</sub>>，|l<sub>A</sub>>，|H`_B>，|V`<sub>B</sub>>，-|l`_B>，|l`_B>}。在一个相干时间内，发送端Alice发送N个数据符号给合法接收端Bob，发送端Alice进行信道估计得到的加密信道系数为

The first step is to form a first six-dimensional vortex pattern from the uplink transmit channel coefficients and the uplink receive channel coefficients in the uplink channel coefficients of the sender, that is, the encrypted channel coefficients.

For example, the first six-dimensional vortex pattern of Alice at the sending end can be {S _A , S` <sub>B</sub> }{|H <sub>A</sub> >, |V <sub>A</sub> >, -|l <sub>A</sub> >, |l <sub>A</sub> >, |H` _B >, | _{V`B</sub> >, -| <sub>l`B} >, | _l`B >}. Within a coherence time, the sender Alice sends N data symbols to the legitimate receiver Bob, and the encrypted channel coefficient obtained by the sender Alice through channel estimation is

In the second step, the downlink transmit channel coefficients and the downlink receive channel coefficients in the downlink channel coefficients of the legal receiving end are formed into a second six-dimensional vortex pattern, that is, the encrypted channel coefficients

在此相干时间内，发送端Alice、合法接收端Bob进行信道估计得到对应的信道系数为

将

作为密钥符号与数据点进行矢量相乘实现加密，并对每个已调符号点进行矢量叠加的加密操作，得到加密后的发送符号。Then, the encrypted channel coefficient is used as the key symbol to perform vector multiplication and vector superposition with each data symbol point in the information to be transmitted to generate an encrypted transmission symbol; the above-mentioned data symbol points include that the transmitting end maps the bit data into a constellation through modulation Adjusted symbol points on the graph. Alice at the sender can use some modulation method to map the bit data to a modulated symbol point on the constellation

During this coherence time, the transmitting end Alice and the legitimate receiving end Bob perform channel estimation to obtain the corresponding channel coefficients as

Will

As the key symbol and the data point, the vector multiplication is performed to realize encryption, and the encryption operation of vector superposition is performed on each adjusted symbol point to obtain the encrypted transmission symbol.

上述得到加密信息的公式为：，

其中，

为已调符号点，

为加密信息，

为密钥，CRC为校验码。Finally, a check code is added to the encrypted transmission symbol to generate encrypted information. The above-mentioned adding check code may be adding a CRC check, so as to obtain the encrypted information encrypted by Alice at the sending end

The above formula for obtaining encrypted information is:

in,

is the adjusted symbol point,

To encrypt information,

is the key, and CRC is the check code.

In the above implementation process, the information to be transmitted at the transmitting end is obtained; then the non-diffraction vortex electromagnetic wave channel is established according to the non-diffraction vortex beam sent by the transmitting end and the legitimate receiving end; finally, the transmission is to be transmitted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel. The information is encrypted to generate encrypted information. By establishing a diffraction-free vortex electromagnetic wave channel, the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used to generate the key technology at the same time, and the physical information such as the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used as The key seed generates a key, generates a corresponding symbol during the modulation process, and uses the key containing the above information to encrypt the transmitted service data, and uses the phase and the modulated symbol vector between the wireless channels of different non-diffraction vortex electromagnetic wave modes. The superposition realizes encryption, improves the security of data transmission on the communication node, and enables the expected user and the eavesdropper to receive different key packages during the key negotiation stage, so that the eavesdropper cannot obtain the key between normal communication users. To ensure the safe transmission of data, the non-diffraction vortex electromagnetic wave can self-recover after passing through obstacles, and the vortex mode and quantum state can be maintained during long-distance transmission. Therefore, in the wireless communication system, the channel physical characteristics of the non-diffraction vortex electromagnetic wave mode are also It determines the randomness and independence of the vortex beam mode characteristic space, so that the two different wireless channels have packet loss differences. And the system has a certain tolerance to the channel phase error. Compared with the currently commonly used physical layer encryption technology, the method of generating the key is simple and the complexity is low, and at the same time, its randomness ensures the security of encryption.

Wherein, the decryption by the legitimate receiver specifically includes the following steps:

First, the sender sends the encrypted information to the legitimate receiver; after the encryption is completed, the sender Alice correctly transmits the ciphertext information to the legitimate receiver Bob through the channel.

对密文进行按位模二加解密，即可获得明文信息，上述采用模二加运算属于现有技术，相加后达到2就进位，但只保留一位，在此就不再赘述。合法接收端通过解密就可以得到明文，就可以知道传输端传输的信息，从而保证了信息的准确传输。Then, the legitimate receiving end uses the key to perform bitwise modulo two encryption and decryption on the encrypted information to generate plaintext information. The legitimate receiver Bob uses the key

The plaintext information can be obtained by performing bitwise modulo-2 encryption and decryption on the ciphertext. The above-mentioned modulo-2 addition operation belongs to the prior art. After the addition reaches 2, it is carried over, but only one bit is reserved, which will not be repeated here. The legitimate receiving end can obtain the plaintext through decryption, and can know the information transmitted by the transmitting end, thus ensuring the accurate transmission of the information.

Among them, during the key negotiation process, the sender Alice and the legitimate receiver Bob alternately send key packets according to time slots, which specifically includes the following steps:

The sender and the legitimate receiver send key packets alternately according to time slots. Wherein, the above key package includes the key package sent by the sender to the legitimate receiver and the key package sent by the legitimate receiver to the sender. Referring to FIG. 4 , FIG. 4 is a schematic structural diagram of a key packet sent by the transmitting end Alice to the legitimate receiving end Bob in the dynamic security encryption method for diffraction-free vortex electromagnetic wave channel characteristics provided by an embodiment of the present invention. The content of the key package sent by the sender Alice to the legitimate receiver Bob includes: the first key package serial number, the first key content with a length of L bits generated by pseudo-random, the first check code and other necessary information for transmission; Bob sends The content of the key package to Alice includes: the second key package serial number, the pseudo-randomly generated second key content with a length of L bits, the second check code, whether the first key package sent by the other party is received and other transmissions necessary information.

Before each data transmission, Alice and Bob both parties perform a key negotiation process:

Assuming that the sender Alice knows that the main channel contains the channel state information (CSI) of the phase information of the non-diffraction vortex electromagnetic wave mode, which is marked as p _A in Figure 2, the illegal eavesdropper Eve is within the communication range and can receive the information sent by the sender Alice. message, the eavesdropping channel is denoted as q _A . Among them, the attack method of the eavesdropper is an intelligent attack type. The so-called intelligent attack type eavesdropper knows the encryption method but does not know the specific key information.

Wherein, the above-mentioned sending end and legal receiving end are all installed with a channel measurement module, a vortex beam quantization module, a key agreement module, an encryption module and a data processing module. Specifically, please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a transmitting end Alice and a legitimate receiving end Bob according to an embodiment of the present invention. The transmitting end Alice is installed with a first channel measurement module 1, a first vortex beam quantization module 2, a first key agreement module 3, a first encryption module 4 and a first data processing module 5. The above-mentioned first channel measurement module 1 Used for channel state measurement to obtain channel state information; the above-mentioned first vortex beam quantization module 2 is used to generate a diffraction-free vortex beam; the above-mentioned first key negotiation module 3 is used to generate a key according to the vortex beam feature negotiation ; The above-mentioned first encryption module 4 and first data processing module 5 respectively generate encryption keys according to the results of key negotiation. The legitimate receiving end Bob is installed with a second channel measurement module 6 , a second vortex beam quantization module 7 , a second key agreement module 8 , a second encryption module 9 and a second data processing module 10 . The above-mentioned second channel measurement module 6 is used to measure the channel characteristics of the legitimate receiver Bob to obtain channel state information; the above-mentioned second vortex beam quantization module 7 is used to generate a diffraction-free vortex wave; the above-mentioned second key agreement module 8 is used for the key negotiation of the legal receiver Bob; the above-mentioned second encryption module 9 and the second data processing module 10 are respectively used for the data encryption processing of the legal receiver Bob.

In the pilot time slot, the sender Alice sends a probe data packet to the second channel measurement module 6 of the legal receiver Bob, and receives a response packet from the second channel measurement module 6 of the legal receiver Bob; the sender Alice analyzes the response data by analyzing the response data. The packet obtains its channel parameter sequence, and sends the above-mentioned channel parameter sequence to the first vortex beam quantization module 2; the second channel measurement module 6 of the legal receiver Bob and the first channel measurement module 1 and the second vortex of the sender Alice The rotating beam quantization module 7 is connected. The second channel measurement module 6 of the legal receiver Bob receives the probe data packet from the first channel measurement module 1 of the sender Alice, and sends a response data packet to the first channel measurement module 1 of the sender Alice; the second channel measurement module 6 passes the The detection data packet is analyzed to obtain the channel parameter sequence of the legal receiver Bob, and the channel parameter sequence of the legal receiver Bob is sent to the second vortex beam quantization module 7 .

Please refer to FIG. 7 , which is a schematic structural block diagram of an electronic device provided by an embodiment of the present application. The electronic device includes a memory 101, a processor 102, and a communication interface 103. The memory 101, the processor 102, and the communication interface 103 are directly or indirectly electrically connected to each other to realize data transmission or interaction. For example, these elements may be electrically connected to each other through one or more communication buses or signal lines. The memory 101 can be used to store software programs and modules, such as program instructions/modules corresponding to a dynamic security encryption method without diffraction vortex electromagnetic wave channel characteristics provided in the embodiments of the present application, the processor 102 executes the program instructions/modules stored in the memory 101. Software programs and modules that perform various functional applications and data processing. The communication interface 103 can be used for signaling or data communication with other node devices.

The memory 101 may be, but not limited to, a random access memory (Random Access Memory, RAM), a read only memory (Read Only Memory, ROM), a programmable read only memory (Programmable Read-Only Memory, PROM), an erasable memory Read-only memory (Erasable Programmable Read-Only Memory, EPROM), Electric Erasable Programmable Read-Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.

The processor 102 may be an integrated circuit chip with signal processing capability. The processor 102 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; it may also be a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

It can be understood that the structure shown in FIG. 7 is only for illustration, and the electronic device may further include more or less components than those shown in FIG. 7 , or have different configurations from those shown in FIG. 7 . Each component shown in FIG. 7 may be implemented in hardware, software, or a combination thereof.

In the embodiments provided in this application, it should be understood that the disclosed method may also be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architectures, functions and possible implementations of apparatuses, methods and computer program products according to various embodiments of the present application. operate. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which contains one or more possible functions for implementing the specified logical function(s) Execute the instruction. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It is also noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in dedicated hardware-based systems that perform the specified functions or actions , or can be implemented in a combination of dedicated hardware and computer instructions.

In addition, each functional module in each embodiment of the present application may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

If the above functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the above-mentioned methods of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

To sum up, a dynamic security encryption method for the channel characteristics of a diffraction-free vortex electromagnetic wave provided by the embodiment of the present application obtains the information to be transmitted at the sending end; Vortex electromagnetic wave channel; finally, according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel, the information to be transmitted is encrypted to generate encrypted information. By establishing a diffraction-free vortex electromagnetic wave channel, the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used to generate the key technology at the same time, and the physical information such as the vortex mode estimation of the adjacent time slot physical channel and the transmission vortex mode are used as The key seed generates a key, generates a corresponding symbol during the modulation process, and uses the key containing the above information to encrypt the transmitted service data, and uses the phase and the modulated symbol vector between the wireless channels of different non-diffraction vortex electromagnetic wave modes. The superposition realizes encryption, improves the security of data transmission on the communication node, and enables the expected user and the eavesdropper to receive different key packages during the key negotiation stage, so that the eavesdropper cannot obtain the key between normal communication users. To ensure the safe transmission of data, the non-diffraction vortex electromagnetic wave can self-recover after passing through obstacles, and the vortex mode and quantum state can be maintained during long-distance transmission. Therefore, in the wireless communication system, the channel physical characteristics of the non-diffraction vortex electromagnetic wave mode are also It determines the randomness and independence of the vortex beam mode characteristic space, so that the two different wireless channels have packet loss differences. And the system has a certain tolerance to the channel phase error. Compared with the currently commonly used physical layer encryption technology, the method of generating the key is simple and the complexity is low, and at the same time, its randomness ensures the security of encryption.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

It will be apparent to those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Accordingly, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the application is to be defined by the appended claims rather than the foregoing description, which is therefore intended to fall within the scope of the claims. All changes that come within the meaning and scope of equivalents to are included in this application. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (10)

1. A dynamic security encryption method for diffraction-free vortex electromagnetic wave channel characteristics is characterized by comprising the following steps:

acquiring information to be transmitted of a transmitting end;

establishing a non-diffraction vortex electromagnetic wave channel according to non-diffraction vortex beams sent by a sending end and a legal receiving end;

and encrypting the information to be transmitted according to the channel characteristics in the diffraction-free vortex electromagnetic wave channel to generate encrypted information.

2. The dynamic security encryption method for the non-diffraction vortex electromagnetic wave channel characteristics according to claim 1, wherein the step of encrypting the information to be transmitted according to the channel characteristics in the non-diffraction vortex electromagnetic wave channel to generate the encrypted information comprises the following steps:

acquiring channel state information in a non-diffraction vortex electromagnetic wave channel;

generating an encrypted channel coefficient according to the channel state information;

taking the encrypted channel coefficient as a key symbol, and performing vector multiplication and vector superposition on each data symbol point in the information to be transmitted to generate an encrypted sending symbol;

and adding a check code to the encrypted transmission symbol to generate encrypted information.

3. The dynamic security encryption method for the non-diffractive vortex electromagnetic wave channel characteristic of claim 2, wherein the data symbol points comprise modulated symbol points on a constellation map mapped by the transmitting end through modulation.

4. The dynamic security encryption method for the non-diffraction vortex electromagnetic wave channel characteristics according to claim 2, wherein the step of obtaining the channel state information in the non-diffraction vortex electromagnetic wave channel comprises the steps of:

in the same time slot or coherence time, a legal receiving end and a sending end simultaneously and respectively send pilot frequency to perform channel detection of uplink and downlink channels, the sending end obtains an uplink channel coefficient, and the legal receiving end obtains a downlink channel coefficient to obtain channel state information.

5. The dynamic security encryption method for the channel characteristics of the non-diffractive vortex electromagnetic wave of claim 4, wherein the step of generating the encrypted channel coefficients according to the channel state information comprises the steps of;

forming a first six-dimensional vortex mode by an uplink transmitting channel coefficient and an uplink receiving channel coefficient in the uplink channel coefficient of a transmitting end, namely encrypting the channel coefficient

Forming a second six-dimensional vortex mode by using the downlink transmitting channel coefficient and the downlink receiving channel coefficient in the downlink channel coefficient of the legal receiving end, namely encrypting the channel coefficient

6. The dynamic security encryption method for the non-diffractive vortex electromagnetic wave channel characteristic of claim 1, further comprising the steps of:

the sending end sends the encrypted information to a legal receiving end;

and the legal receiving terminal performs bitwise modulo two encryption and decryption on the encrypted information by using the secret key to generate plaintext information.

7. The dynamic security encryption method for the non-diffractive vortex electromagnetic wave channel characteristic of claim 1, further comprising the steps of:

the sending end and the legal receiving end alternately send the key packages according to the time slot.

8. The dynamic security encryption method for the characteristics of the non-diffractive vortex electromagnetic wave channel according to claim 7, wherein the key packets include a key packet sent by a sending end to a legal receiving end and a key packet sent by a legal receiving end to a sending end.

9. The dynamic security encryption method for the channel characteristics of the non-diffraction vortex electromagnetic waves according to any one of claims 1 to 8, wherein a channel measurement module, a vortex beam quantization module, a key negotiation module, an encryption module and a data processing module are installed at both the sending end and the legal receiving end.

10. An electronic device, comprising:

a memory for storing one or more programs;

a processor;

the one or more programs, when executed by the processor, implement the method of any of claims 1-9.

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