CN117278108B - Data transmission method and device - Google Patents
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Abstract
The disclosure provides a data transmission method and device, wherein the method comprises the following steps: acquiring target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period before the first period; the target vector is used for indicating the polarization state of the star light in the previous period; generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; encoding the target data to obtain encoded data, and encrypting the encoded data by adopting a random number sequence to obtain encrypted data; the encrypted data is sent to the laser receiving terminal, so that the encrypted data is encrypted by adopting a true random number in a random number sequence generated by a target vector for indicating the polarization state of a target star, the true random number has unpredictability and unrepeatability and is difficult to crack, and the safety of communication data transmission is improved.
Description
Technical Field
The disclosure relates to the technical field of satellite communication, and in particular relates to a data transmission method and device.
Background
With the continuous development of information technology and network technology, the data exchange and information transmission amount of various information systems are continuously increased, and it is becoming increasingly important to ensure the security of information transmission. In this case, a laser secret communication technology has been developed, wherein the laser secret communication can be applied to many fields, such as aerospace, finance, and the like.
In the related art, the encryption key is generated by adopting the pseudo-random number in the laser secret communication, and the communication data is encrypted by adopting the encryption key, however, with the continuous increase of the computing capacity, the key generated by adopting the pseudo-random number is easy to be intercepted and cracked, so that the communication data has potential safety hazard.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present disclosure is to provide a data transmission method, which generates a random number sequence corresponding to a first period according to a target vector for indicating a polarization state of a star body in a previous period, and encrypts encoded data corresponding to target data to be transmitted currently according to the random number sequence, so as to encrypt the encoded data by using a true random number in the random number sequence generated by the target vector for indicating the polarization state of the target star body, wherein the true random number has unpredictability and unrepeatability, is difficult to crack, and improves the security of communication data transmission.
A second object of the present disclosure is to propose a data transmission method.
A third object of the present disclosure is to propose a data transmission device.
A fourth object of the present disclosure is to propose another data transmission device.
A fifth object of the present disclosure is to propose an electronic device.
A sixth object of the present disclosure is to propose a computer readable storage medium.
A seventh object of the present disclosure is to propose a computer programme product.
To achieve the above object, an embodiment of a first aspect of the present disclosure provides a data transmission method, which is applied to a laser emission terminal, including: acquiring target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period; wherein the target vector is used for indicating the polarization state of the star light in the previous period; generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence to obtain encrypted data; and sending the encrypted data to a laser receiving terminal.
The data transmission method of the embodiment of the disclosure is applied to a laser transmitting terminal, and a star light target vector obtained by detecting star light emitted by a target star in a first period is obtained by acquiring target data to be transmitted in the first period and a star light before the first period; the target vector is used for indicating the polarization state of the star light in the previous period; generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; encoding the target data to obtain encoded data, and encrypting the encoded data by adopting a random number sequence to obtain encrypted data; the encrypted data is sent to the laser receiving terminal, so that a random number sequence corresponding to the first time period is generated according to a target vector for indicating the polarization state of the star body in the previous time period, the coded data corresponding to the target data to be sent currently is encrypted according to the random number sequence, the coded data can be encrypted by adopting a true random number in the random number sequence generated by the target vector for indicating the polarization state of the star body, the true random number has unpredictability and unrepeatability, is difficult to crack, and the safety of communication data transmission is improved.
To achieve the above object, an embodiment of a second aspect of the present disclosure provides another data transmission method, which is applied to a laser receiving terminal, including: receiving encrypted data of a first period sent by a laser emission terminal, wherein the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period before the first period; the target vector is used for indicating the polarization state of the star light in the previous period, generating a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period, encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
To achieve the above object, an embodiment of a third aspect of the present disclosure provides a data transmission device, which is applied to a laser emission terminal, including: the acquisition module is used for acquiring target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period; wherein the target vector is used for indicating the polarization state of the star light in the previous period; the generation module is used for generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; the processing module is used for encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence to obtain encrypted data; and the sending module is used for sending the encrypted data to the laser receiving terminal.
To achieve the above object, a fourth aspect of the present disclosure provides another data transmission device applied to a laser receiving terminal, including: the receiving module is used for receiving encrypted data of a first period sent by the laser transmitting terminal, wherein the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period before the first period; the target vector is used for indicating the polarization state of the star light in the previous period, generating a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period, encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
To achieve the above object, an embodiment of a fifth aspect of the present disclosure proposes an electronic device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor executes the computer program to implement a data transmission method according to an embodiment of the first aspect of the present disclosure, or implement a data transmission method according to an embodiment of the second aspect of the present disclosure.
In order to achieve the above object, an embodiment of a sixth aspect of the present disclosure proposes a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements a data transmission method according to an embodiment of the first aspect of the present disclosure, or implements a data transmission method according to an embodiment of the second aspect of the present disclosure.
To achieve the above object, an embodiment of a seventh aspect of the present disclosure proposes a computer program product, which when executed by an instruction processor in the computer program product, implements a data transmission method as described in an embodiment of the first aspect of the present disclosure, or implements a data transmission method as described in an embodiment of the second aspect of the present disclosure.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flow chart of a data transmission method according to an embodiment of the disclosure;
fig. 2 is a flowchart of another data transmission method according to an embodiment of the disclosure;
Fig. 3 is a flowchart of another data transmission method according to an embodiment of the disclosure;
fig. 4 is a schematic implementation diagram of a data transmission method according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of the generation principle of random numbers based on star polarization characteristics according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a structure of a random number generating device based on star polarization characteristics according to an embodiment of the present disclosure;
fig. 7 is a flowchart of another data transmission method according to an embodiment of the disclosure;
fig. 8 is a schematic structural diagram of a data transmission device according to an embodiment of the disclosure;
fig. 9 is a schematic structural diagram of another data transmission device according to an embodiment of the disclosure;
fig. 10 is a block diagram of an electronic device for data transmission, according to an example embodiment.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.
Random numbers have wide application in the fields of computational simulation, cryptography, and statistical sampling. For example, random numbers are used in the field of information security to ensure confidentiality, authenticity, and integrity of information. Random numbers are critical to the encryption protocol, which is necessary to ensure the security, privacy, and integrity of information.
Random numbers fall into two categories: pseudo-random numbers and true random numbers. The pseudo-random number is generated from random seeds by using a deterministic algorithm, and the pseudo-random number is used by modern digital electronic information systems, but with the continuous increase of computing power, the security of the pseudo-random number cannot be guaranteed, and the pseudo-random number sequences generated by the same seed in a deterministic manner are identical, which can cause serious problems for the application of the information security system. Whereas true random numbers come from unpredictable physical systems, known as sources of physical entropy. The randomness in the physical entropy source is extracted to generate random numbers, so that the random numbers can be guaranteed to have real unpredictability. For example, laser phase noise, vacuum fluctuation noise, chaotic light source, amplified spontaneous emission noise and the like can be used as physical entropy sources to generate true random numbers, which are difficult to predict and have good randomness.
The key to true random numbers is to select the appropriate physical entropy source. Currently, related researches and technical solutions mainly use various special light sources, such as erbium-doped fiber amplifiers without input light, distributed feedback lasers operating near a threshold, random lasers based on fiber backscattering, and the like. The above scheme is characterized by complex device and poor stability of the light source. Therefore, a need exists for a light source that has good randomness and is simple and readily available.
The star luminescence in the universe implies the polarization properties of the star. The sun is one of the most recently acquired light sources, and the change of the sunlight is related to the change of the sun itself, which has rich random characteristics, so that the current research on generating random numbers based on stars is mainly focused on generating random numbers based on the sun, such as a random number generation method based on solar light source irrelevant quantum random number generation protocol and solar spectrum information, a random number generation method for directly detecting the light intensity of the sunlight by using a camera, and the like.
However, the above-described star-based random number generation method uses only information on the intensity, frequency, and the like of the star light emission, and does not use the polarization characteristics of the star light emission. Furthermore, the post-processing of these methods is relatively complex, has questionable randomness, and has a low rate of generation.
Therefore, in view of the above problems, the present disclosure proposes a data transmission method and apparatus.
It should be noted that, the application scenario of the embodiment of the present disclosure may be laser secret communication, for example, may be applied to a scenario of secret communication between satellites, secret communication between satellites and ground stations, secret communication between ground stations, or the like, and the propagation channel is a free space channel or a fiber channel, etc., and the data transmission method of the embodiment of the present disclosure may be applied to a laser transmitting terminal, where the laser transmitting terminal may be located on any satellite in secret communication between satellites, on a satellite or ground station in secret communication between satellites and ground stations, or on any ground station in secret communication between ground stations.
The following describes a data transmission method and apparatus according to an embodiment of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a flowchart of a data transmission method according to an embodiment of the disclosure.
As shown in fig. 1, the data transmission method may include the steps of:
step 101, obtaining target data to be sent in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period before the first period.
Wherein the target vector is used to indicate the polarization state of the star light in the previous period.
When the laser transmitting terminal transmits data of a first period, the data to be transmitted of the first period can be obtained, and a target vector of star light obtained by detecting star light emitted by a target star in a period before the first period is obtained, wherein the first period can be a current period for example.
As an example, the target star is the sun, and each period may include multiple detection periods, and in each detection period, a polarization detector (e.g., a polarization camera) is used to sample the star light of the target star at a high speed, so as to obtain a target vector of the star light in each detection period, where the target vector in each detection period may be used to indicate a polarization state of the star light in a corresponding period, for example, the target vector may be a stokes vector.
Step 102, generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period.
As an example, according to the target vector of the star light detected in the previous period, the value of each element of the target column (e.g., the first column) in the polarization matrix corresponding to the target vector in the previous period is determined, and according to the value of each element of the target column in the polarization matrix corresponding to the target vector in the previous period, the random number sequence corresponding to the first period is generated. It should be noted that, the polarization states of the star light in the corresponding period have randomness, so that the random number sequence corresponding to the first period is generated according to the target vector of the star light detected in the previous period, and the random number sequence has real randomness, unpredictability and unrepeatability.
Step 103, encoding the target data to obtain encoded data, and encrypting the encoded data by using a random number sequence to obtain encrypted data.
In order to improve the security of communication data, as an example, target data is encoded to obtain encoded data, and a key is generated from a random data sequence, and the encoded data is encrypted with the key to obtain encrypted data.
And 104, transmitting the encrypted data to a laser receiving terminal.
Further, the encrypted data is transmitted to the laser receiving terminal by using the laser transmitting terminal.
It should be noted that, when the key is used to encrypt the encoded data, the key may be sent to the receiving party, and in response to the receiving party receiving the encrypted data in the first period, the key may be used to decrypt the encrypted data in the first period to obtain decrypted data, and decode the decrypted data to obtain the target data.
In summary, the target data to be sent in the first period and the target vector of the star light obtained by detecting the star light emitted by the target star in the period before the first period are obtained; the target vector is used for indicating the polarization state of the star light in the previous period; generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; encoding the target data to obtain encoded data, and encrypting the encoded data by adopting a random number sequence to obtain encrypted data; and sending the encrypted data to a laser receiving terminal. Therefore, according to the target vector for indicating the polarization state of the star body in the previous period, the random number sequence corresponding to the first period is generated, and the coded data corresponding to the target data to be transmitted currently is encrypted according to the random number sequence, so that the coded data can be encrypted by adopting the true random number in the random number sequence generated by the target vector for indicating the polarization state of the star body, and the true random number has unpredictability and unrepeatability, is difficult to crack, and improves the safety of communication data transmission.
In order to clearly illustrate how to generate a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period in the embodiment, another data transmission method is proposed in the disclosure.
Fig. 2 is a flowchart of another data transmission method according to an embodiment of the disclosure.
As shown in fig. 2, the data transmission method may include the steps of:
in step 201, target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period are obtained.
Wherein the target vector is used to indicate the polarization state of the star light in the previous period.
Step 202, determining the value of each element of the target column in the polarized matrix of the star light of at least one first detection period according to the target vector of the star light detected by at least one first detection period in the plurality of first detection periods in the previous period.
As a possible implementation manner, the previous period includes a plurality of first detection periods, each first detection period detects to obtain a target vector of the star light, and for any first detection period in the previous period, an initial vector of the star light in any first detection period is obtained; wherein the initial vector is used to indicate the unpolarized state of the star light; and determining the value of each element of the target column in the polarization matrix of the star light of any first detection period according to the target vector and the initial vector of the star light detected in any first detection period.
For example, taking the target vector as the Stokes vector, ifAn initial Stokes vector (initial vector) representing the star light,/and a method for generating the same>Representing the stokes vector (target vector) measured by the polarization camera. The change of the polarization state of the star light emitted from the interior of the star to the detected star light in the whole process canExpressed by a 4X 4 Mueller matrix (polarization matrix), denoted as M, & lt/EN & gt>、/>M satisfies the following conditions: />；
Wherein, the luminous characteristic of the target star meets the Planck blackbody radiation law, and the star light emitted by the target star is unpolarized lightCan be expressed as: />；
；
The Stokes vector detected by the polarization detector isAccording to->And the expression of M, yields:
；
from the above, stokes vectors obtained by polarization detectorsEqual to the first column (target column) of matrix M.
Step 203, generating a random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of at least one first detection period.
In an embodiment of the present disclosure, the random number sequence may include a plurality of true random numbers, where the plurality of true random numbers may be generated according to values of elements of a target column in the polarization matrix corresponding to at least one first detection period.
As a possible implementation manner, a target vector obtained by detecting star light emitted by a target star in at least one second detection period in a first period may be obtained, and values of elements of a target column in a polarization matrix of the at least one second detection period are determined according to the target vector detected in the at least one second detection period; and generating a random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of at least one second detection period and the values of the elements of the target column in the polarization matrix of at least one first detection period.
For example, according to the values of the elements of the target column in the polarization matrix corresponding to each second detection period and the values of the elements of the target column in the polarization matrix corresponding to each first detection period, a random number corresponding to the elements of each position of the target column in the polarization matrix corresponding to each second detection period can be generated, and further, according to the random numbers corresponding to the elements of each position of the target column in the polarization matrix in at least one second detection period, a random number sequence is generated.
Step 204, encoding the target data to obtain encoded data, and encrypting the encoded data with a random number sequence to obtain encrypted data.
Step 205, the encrypted data is sent to the laser receiving terminal.
It should be noted that, the execution process of steps 201 and 204 to 205 may be implemented in any manner in each embodiment of the disclosure, which is not limited to this embodiment, and is not repeated.
In summary, determining the value of each element of the target column in the polarized matrix of the star light of at least one first detection period according to the target vector of the star light detected by at least one first detection period in the plurality of first detection periods in the previous period; according to the value of each element of the target column in the polarization matrix of at least one first detection period, a random number sequence corresponding to the first period is generated, and a random number sequence corresponding to the first period is generated, so that a random number sequence with true random numbers can be effectively generated according to the target vector of star light detected in the previous period.
In order to clearly illustrate how to generate a random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of at least one first detection period in the above embodiment, another data transmission method is proposed in the present disclosure.
Fig. 3 is a flowchart of another data transmission method according to an embodiment of the disclosure.
As shown in fig. 3, the data transmission method may include the steps of:
step 301, obtaining target data to be sent in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period.
Wherein the target vector is used to indicate the polarization state of the star light in the previous period.
Step 302, determining the value of each element of the target column in the polarized matrix of the star light of at least one first detection period according to the target vector of the star light detected by at least one first detection period in the plurality of first detection periods in the previous period.
Step 303, obtaining a target vector obtained by detecting star light emitted by a target star in at least one second detection period in the first period.
Step 304, determining the value of each element of the target column in the polarization matrix of at least one second detection period according to the target vector detected by at least one second detection period.
In the embodiment of the present disclosure, the values of the elements of the target column in the polarization matrix corresponding to each second detection period are determined according to the target vector detected in each second detection period, which may be referred to step 202 in the above embodiment, and will not be described in detail.
Step 305, for any second detection period in at least one second detection period, generating a random number according to a difference between a value of an element at any position of a target column in the polarization matrix corresponding to any second detection period and a mean value of an element at any position of the target column in the polarization matrix corresponding to at least one first detection period.
As a first possible implementation manner, the average value of the element at any position of the target column in the polarization matrix corresponding to each first detection period in the previous period may be obtained, and the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period in the first period and the average value of the element at any position of the target column in the polarization matrix corresponding to each first detection period may be obtained, so as to obtain the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period and the average value of the element at any position of the target column in the polarization matrix corresponding to each first detection period, and further, the random number may be generated according to the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period and the average value of the element at any position of the target column in the polarization matrix corresponding to each first detection period.
As a second possible implementation manner, the average value of the element at any position of the target column in the polarization matrix corresponding to the partial first detection period in the previous period may be obtained, and the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period in the partial second detection period in the first period may be different from the average value of the element at any position of the target column in the polarization matrix corresponding to the partial first detection period, so as to obtain the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period in the partial second detection period and the average value of the element at any position of the target column in the polarization matrix corresponding to the partial first detection period, and further, the random number is generated according to the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period in the partial second detection period and the average value of the element at any position of the target column in the polarization matrix corresponding to the partial first detection period.
To facilitate the generation of random numbers, the difference may be amplified, for example, the square, the third power, the fourth power, or the like of the difference may be taken as the corresponding random number.
Step 306, generating a random number sequence according to the random numbers corresponding to the elements at each position of the target column in the polarization matrix of at least one second detection period.
As one possible implementation manner, in the case of determining in step 305 by using the first possible implementation manner, the random numbers corresponding to the elements at each position of the target column in the polarization matrix corresponding to each second detection period in the first period are sorted according to the detection time of the corresponding second detection period and the position of the target column in the corresponding polarization matrix, so as to obtain a random number sequence.
As another possible implementation manner, in the case of determining in step 305 by using the second possible implementation manner, the random numbers corresponding to the elements at each position of the target column in the polarization matrix in each second detection period in the part of the second detection periods are sorted according to the detection time of the corresponding second detection period and the position of the target column in the corresponding polarization matrix, so as to obtain a random number sequence.
Step 307, encoding the target data to obtain encoded data, and encrypting the encoded data with a random number sequence to obtain encrypted data.
And step 308, transmitting the encrypted data to the laser receiving terminal.
It should be noted that the execution processes of steps 301 to 303 and steps 307 to 308 may be implemented in any manner in each embodiment of the disclosure, which is not limited to this embodiment, and is not repeated herein.
In summary, determining the value of each element of the target column in the polarization matrix of at least one second detection period according to the target vector detected by at least one second detection period; generating random numbers according to the difference between the value of the element at any position of the target column in the polarization matrix corresponding to any second detection period and the average value of the element at any position of the target column in the polarization matrix corresponding to at least one first detection period for any second detection period in at least one second detection period; according to the random numbers corresponding to the elements of the target columns in the polarization matrix of at least one second detection period, a random number sequence is generated, and therefore, according to the values of the elements of the target columns in the polarization matrix of at least one first detection period and the values of the elements of the target columns in the polarization matrix of at least one second detection period, true random numbers can be effectively generated, and therefore, the coded data are encrypted by the aid of the true random numbers, the true random numbers have unpredictability and unrepeatability and are difficult to crack, and safety of communication data transmission is improved.
The implementation principle of the data transmission method according to the embodiment of the present disclosure may be as shown in fig. 4, where a random number generator device is installed at the sender, on the basis of any embodiment of the present disclosure. As shown in fig. 5, the device receives star light, and random number generation based on star polarization characteristics includes a polarization detector and a data processing section. The polarization camera is used for sampling the star light at a high speed to obtain a Stokes vector of the star light. The data processing part processes the data acquired by the polarization measuring instrument to obtain a random number.
In the embodiment of the present disclosure, the data transmission method mainly includes the following steps:
step 1: collecting star light, and detecting the star light at high speed by using a polarization measuring instrument to obtain a Stokes vector of the star light;
if it isAn initial stokes vector representing the luminescence of the star, and (2)>Representing the stokes vector measured by the polarization camera. The change of the polarization state of the star light emitted from the interior of the star to the detected whole process can be represented by a 4 x 4 Mueller matrix (polarization matrix), denoted as M, then>、/>M satisfies the following conditions: />；
The luminous characteristics of the star meet the Planck blackbody radiation law, and the star light is unpolarized light The expression is:；
；
the Stokes vector detected by the polarization detector is recorded asAccording to->And the expression of M, yields:
；
from the above, stokes vectors obtained by polarization detectorsEqual to the first column (target column) of matrix M. />The change of the polarization state of the star light caused by the external environment in the whole process of transmitting and propagating from the interior of the star to the polarization detector is directly reflected. Furthermore, the stars continuously undergo intense nuclear fusion reaction, and the activities of the stars in the atmosphere randomly fluctuate. Influence of random variations of the stars themselves on the polarization state of the stars lightThe whole matrix is on the M matrix, namely, each element in the M matrix can randomly change. The variation is derived from the random activity of the star, a truly random physical process that can be used to generate truly random numbers.
Step 2: the polarization detector sends the measured star light polarization data into the data processing part, and the data processing part calculates the second-order fluctuation of the M matrix element in real time to obtain the true random number. The function of calculating the second-order fluctuation is to amplify the change of M matrix elements, so that the change is more obvious and is beneficial to the generation of random numbers.
In the specific embodiment, as shown in fig. 6, taking the sun as a target star as an example, the generation of random numbers based on the polarization characteristics of the star is divided into two modules:
The module 1 is a polarization measuring instrument and may be constituted by a polarization camera. The construction of the polarization camera includes a rotatable polarizer and a wave plate, which are charge coupled device (charge coupled device, CCD) cameras. The basic principle is that the light intensity of the incident light is sampled by the rapid rotation of a polaroid or a wave plate, and the Stokes vector of the incident light can be solved according to the light intensity data detected by the CCD. The stokes vector of the sunlight is obtained through a polarization camera and corresponds to the first column element of the Mueller matrix. The polarization camera transmits stokes vector data to the data processing section.
The module 2 is a data processing part. The data processing part may be a personal computer, which receives the data of the polarization camera in real time, and calculates the second order fluctuation of the first column element of the Mueller matrix according to the steps of:
sampling of solar stokes vectors into time segments, e.g、/>、…、/>…, note->The first 4 elements of the M matrix detected in the time period are +.>、/>、/>、/>. These 4 elements are +.>A slight change in the time period takes place continuously, and +.>Mean value of 4 elements of the first column of the M matrix in the time period +.>、/>、、/>. Then, for->The M matrix elements detected in the time period are calculated according to the following formula:
；
；
；
；
Wherein,、/>、/>、/>namely +.>Second order fluctuation of the first column element of Mueller matrix in time period, will +.>、/>、/>、/>The sequences are combined in sequence, so that a true random sequence can be obtained, random number generation by utilizing the polarization characteristics of the solar star is completed, the true random sequence is used as a key source and is sent to a receiving party through a key distribution channel, and the two parties are ensured to receive the same key.
Step 3: the communication data is changed into encrypted data after optical encoding and optical encryption. The laser communication terminal of the sender sends the encrypted data to the laser communication terminal of the receiver through a free space channel or a fiber channel, the receiver decrypts the data by using the same secret key as the sender, and then the data is optically decoded to obtain communication data, so that laser secret communication is realized.
In order to implement the above embodiments, another data transmission method is proposed in the embodiments of the present disclosure. It should be noted that the data transmission method of the embodiment of the present disclosure may be applied to a laser receiving terminal.
Fig. 7 is a flowchart of another data transmission method according to an embodiment of the disclosure.
As shown in fig. 7, the data transmission method may include the steps of:
step 701, receiving encrypted data of a first period sent by a laser emission terminal.
The encrypted data is a target vector of star light obtained by acquiring target data to be transmitted in a first period and detecting star light emitted by a target star in a period previous to the first period; the method comprises the steps of generating a random number sequence corresponding to a first period according to a star light target vector detected in a previous period, encoding target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
As a possible implementation manner of the embodiment of the present disclosure, after receiving the encrypted data of the first period sent by the laser transmitting terminal, the method further includes: decrypting the encrypted data in the first period by adopting the secret key to obtain decrypted data; the key is that the laser transmitting terminal splices all random numbers in the random number sequence and sends the spliced random numbers to the laser receiving terminal; decoding the decrypted data to obtain the target data.
It should be noted that, the explanation of the data transmission method executed by the laser transmitting terminal in any of the embodiments of fig. 1 to 6 is also applicable to the data transmission method executed by the laser receiving terminal in the embodiment of fig. 7, and the implementation principle is similar, and will not be repeated here.
The data transmission method is applied to a laser receiving terminal, and encrypted data of a first period sent by a laser transmitting terminal are received, wherein the encrypted data are target data to be sent in the first period and target vectors of star lights obtained by detecting star lights emitted by a target star in a period before the first period; the method comprises the steps of generating a random number sequence corresponding to a first time period according to a target vector of star light detected in the previous time period, encoding target data to obtain encoded data, and encrypting the encoded data by using the random number sequence, so that the random number sequence corresponding to the first time period is generated according to the target vector for indicating the polarization state of the star light in the previous time period, and encrypting the encoded data corresponding to the target data to be transmitted currently according to the random number sequence, and the encoding data can be encrypted by using a true random number in the random number sequence generated by the target vector for indicating the polarization state of the target star, wherein the true random number has unpredictability and unrepeatability and is difficult to crack, and the safety of communication data transmission is improved.
In order to implement the embodiments of fig. 1 to 6, the embodiments of the present disclosure propose a data transmission device. It should be noted that the data transmission device of the embodiment of the present disclosure may be applied to a laser emitting terminal.
Fig. 8 is a schematic structural diagram of a data transmission device according to an embodiment of the disclosure.
As shown in fig. 8, the data transmission apparatus 800 includes: the system comprises an acquisition module 810, a generation module 820, a processing module 830 and a sending module 840.
The acquiring module 810 is configured to acquire target data to be sent in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period; the target vector is used for indicating the polarization state of the star light in the previous period; the generating module 820 is configured to generate a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period; the processing module 830 is configured to encode the target data to obtain encoded data, and encrypt the encoded data with the random number sequence to obtain encrypted data; and a transmitting module 840 for transmitting the encrypted data to the laser receiving terminal.
As a possible implementation manner of the embodiment of the present disclosure, the previous period includes a plurality of first detection periods, each first detection period detects to obtain a target vector of the star light, and the generating module 820 is configured to determine, according to the target vector of the star light detected by at least one first detection period of the plurality of first detection periods in the previous period, values of elements of a target column in a polarization matrix of the star light of the at least one first detection period; and generating a random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of at least one first detection period.
As a possible implementation manner of the embodiment of the present disclosure, the generating module 820 is configured to obtain a target vector obtained by detecting star light emitted by a target star in at least one second detection period in a first period; determining the value of each element of a target column in the polarization matrix of at least one second detection period according to the target vector detected by the at least one second detection period; and generating a random number sequence corresponding to the first time period according to the values of the elements of the target column in the polarization matrix of at least one second detection period and the values of the elements of the target column in the polarization matrix of at least one first detection period.
As a possible implementation manner of the embodiments of the present disclosure, the generating module 820 is configured to generate, for any second detection period in at least one second detection period, a random number according to a difference between a value of an element at any position of a target column in a polarization matrix corresponding to the any second detection period and a mean value of an element at any position of a target column in the polarization matrix corresponding to the at least one first detection period; and generating a random number sequence according to the random numbers corresponding to the elements of each position of the target column in the polarization matrix of at least one second detection period.
As one possible implementation of an embodiment of the present disclosure, a generating module 820 is configured to obtain an initial vector of star light of at least one first detection period; wherein the initial vector is used to indicate the unpolarized state of the star light; and determining the value of each element of the target column in the polarized matrix of the star light of at least one first detection period according to the target vector and the initial vector of the star light detected by at least one first detection period.
As a possible implementation manner of the embodiment of the present disclosure, the processing module 830 is configured to splice random numbers in the random number sequence to obtain a key; and encrypting the coded data by adopting the key to obtain encrypted data of a first period.
As one possible implementation manner of the embodiment of the present disclosure, the sending module 840 is further configured to send the key to the laser receiving terminal; the key is used for the laser receiving terminal to execute the following operations: in response to receiving the encrypted data of the first period, decrypting the encrypted data of the first period with the key to obtain decrypted data; decoding the decrypted data to obtain the target data.
According to the data transmission device, target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period before the first period are obtained; the target vector is used for indicating the polarization state of the star light in the previous period; generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period; encoding the target data to obtain encoded data, and encrypting the encoded data by adopting a random number sequence to obtain encrypted data; and sending the encrypted data to a laser receiving terminal. Therefore, according to the target vector for indicating the polarization state of the star body in the previous period, the random number sequence corresponding to the first period is generated, and the coded data corresponding to the target data to be transmitted currently is encrypted according to the random number sequence, so that the coded data can be encrypted by adopting the true random number in the random number sequence generated by the target vector for indicating the polarization state of the star body, and the true random number has unpredictability and unrepeatability, is difficult to crack, and improves the safety of communication data transmission.
It should be noted that the explanation of the embodiments of the data transmission method in the foregoing embodiments of fig. 1 to 6 is also applicable to the data transmission device in this embodiment, and will not be repeated here.
In order to implement the embodiment of fig. 7, an embodiment of the present disclosure proposes a data transmission device. It should be noted that the data transmission device of the embodiment of the present disclosure may be applied to a laser receiving terminal.
Fig. 9 is a schematic structural diagram of another data transmission device according to an embodiment of the disclosure.
As shown in fig. 9, the data transmission apparatus 900 includes: a receiving module 910.
The receiving module 910 is configured to receive encrypted data of a first period sent by the laser transmitting terminal, where the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period previous to the first period; the method comprises the steps of generating a random number sequence corresponding to a first period according to a star light target vector detected in a previous period, encoding target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
As one possible implementation of the embodiment of the present disclosure, the data transmission apparatus 900 further includes: a decryption module and a decoding module.
The decryption module is used for decrypting the encrypted data in the first period by adopting the secret key so as to obtain decrypted data; the key is that the laser transmitting terminal splices all random numbers in the random number sequence and sends the spliced random numbers to the laser receiving terminal; and the decoding module is used for decoding the decrypted data to obtain the target data.
The data transmission device is applied to a laser receiving terminal, and is used for receiving encrypted data of a first period sent by a laser transmitting terminal, wherein the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period before the first period; the method comprises the steps of generating a random number sequence corresponding to a first time period according to a target vector of star light detected in the previous time period, encoding target data to obtain encoded data, and encrypting the encoded data by using the random number sequence, so that the random number sequence corresponding to the first time period is generated according to the target vector for indicating the polarization state of the star light in the previous time period, and encrypting the encoded data corresponding to the target data to be transmitted currently according to the random number sequence, and the encoding data can be encrypted by using a true random number in the random number sequence generated by the target vector for indicating the polarization state of the target star, wherein the true random number has unpredictability and unrepeatability and is difficult to crack, and the safety of communication data transmission is improved.
In order to implement the above embodiment, the present application further proposes an electronic device, as shown in fig. 10, and fig. 10 is a block diagram of an electronic device for data transmission according to an exemplary embodiment.
As shown in fig. 10, the electronic device 1000 includes:
the memory 1010 and the processor 1020, the bus 1030 connecting the different components (including the memory 1010 and the processor 1020), the memory 1010 storing a computer program that when executed by the processor 1020 implements the data transmission method according to the embodiments of the present disclosure.
Bus 1030 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Electronic device 1000 typically includes many types of electronic device readable media. Such media can be any available media that is accessible by the electronic device 1000 and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 1010 may also include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 1040 and/or cache memory 1050. Electronic device 1000 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 1060 may be used to read from or write to a non-removable, non-volatile magnetic media (not shown in FIG. 10, commonly referred to as a "hard disk drive"). Although not shown in fig. 10, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 1030 through one or more data medium interfaces. Memory 1010 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the various embodiments of the disclosure.
A program/utility 1080 having a set (at least one) of program modules 1070 may be stored, for example, in memory 1010, such program modules 1070 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 1070 typically perform the functions and/or methods in the embodiments described in this disclosure.
The electronic device 1000 may also be in communication with one or more external devices 1090 (e.g., keyboard, pointing device, display, etc.), one or more devices that enable a user to interact with the electronic device 1000, and/or any device (e.g., network card, modem, etc.) that enables the electronic device 1000 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 1092. Also, the electronic device 1000 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through a network adapter 1093. As shown in fig. 10, the network adapter 1093 communicates with other modules of the electronic device 1000 via the bus 1030. It should be appreciated that although not shown in fig. 10, other hardware and/or software modules may be used in connection with electronic device 1000, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processor 1020 executes various functional applications and data processing by running programs stored in the memory 1010.
It should be noted that, the implementation process and the technical principle of the electronic device in this embodiment refer to the foregoing explanation of the data transmission method in the embodiment of the disclosure, and are not repeated herein.
In order to implement the above embodiment, the present application also proposes a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the data transmission method described in the above embodiment.
In order to implement the above embodiments, the present disclosure also provides a computer program product which, when executed by an instruction processor in the computer program product, performs the data transmission method described in the above embodiments.
In the description of this specification, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (13)
1. A data transmission method, applied to a laser emitting terminal, comprising:
acquiring target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period; wherein the target vector is used for indicating the polarization state of the star light in the previous period;
generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period;
encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence to obtain encrypted data;
and sending the encrypted data to a laser receiving terminal.
2. The method of claim 1, wherein said previous period of time comprises a plurality of first detection periods, each of said first detection periods detecting a target vector of said star light,
The generating a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period includes:
determining the value of each element of a target column in a polarized matrix of the star light of at least one first detection period according to the target vector of the star light detected by at least one first detection period in the previous period;
and generating a random number sequence corresponding to the first time period according to the values of all elements of the target column in the polarization matrix of the at least one first detection period.
3. The method according to claim 2, wherein the generating the random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of the at least one first detection period includes:
acquiring a target vector obtained by detecting star light emitted by the target star in at least one second detection period in the first period;
determining the value of each element of a target column in the polarization matrix of at least one second detection period according to the target vector detected by the at least one second detection period;
And generating a random number sequence corresponding to the first time period according to the values of the elements of the target column in the polarization matrix of the at least one second detection period and the values of the elements of the target column in the polarization matrix of the at least one first detection period.
4. The method according to claim 3, wherein the generating the random number sequence corresponding to the first period according to the values of the elements of the target column in the polarization matrix of the at least one second detection period and the values of the elements of the target column in the polarization matrix of the at least one first detection period includes:
generating random numbers according to the difference between the value of an element at any position of a target column in a polarization matrix corresponding to any second detection period and the average value of an element at any position of the target column in the polarization matrix corresponding to at least one first detection period for any second detection period in the at least one second detection period;
and generating the random number sequence according to the random numbers corresponding to the elements of each position of the target column in the polarization matrix of the at least one second detection period.
5. The method according to claim 2, wherein determining the value of each element of the target column in the polarization matrix of the star light in the at least one first detection period according to the target vector of the star light detected in the at least one first detection period in the plurality of first detection periods in the previous period includes:
Acquiring an initial vector of the star light of the at least one first detection period; wherein the initial vector is used to indicate the unpolarized state of the star light;
and determining the value of each element of a target column in the polarized matrix of the star light of the at least one first detection period according to the target vector of the star light detected by the at least one first detection period and the initial vector.
6. The method of claim 1, wherein encrypting the encoded data using the sequence of random numbers to obtain encrypted data comprises:
splicing all random numbers in the random number sequence to obtain a secret key;
and encrypting the coded data by adopting the key to obtain the encrypted data of the first period.
7. The method of claim 6, wherein the method further comprises:
transmitting the key to the laser receiving terminal;
wherein the key is used for the laser receiving terminal to execute the following operations:
decrypting the encrypted data of the first period with the key in response to receiving the encrypted data of the first period to obtain decrypted data;
And decoding the decrypted data to obtain the target data.
8. A data transmission method, applied to a laser receiving terminal, comprising:
receiving encrypted data of a first period sent by a laser emission terminal, wherein the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period before the first period; the target vector is used for indicating the polarization state of the star light in the previous period, generating a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period, encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
9. The method of claim 8, wherein after receiving the encrypted data for the first period of time transmitted by the laser transmitter terminal, the method further comprises:
decrypting the encrypted data in the first period by adopting a secret key to obtain decrypted data; the key is obtained by splicing all random numbers in the random number sequence by the laser transmitting terminal and sending the spliced random numbers to the laser receiving terminal;
And decoding the decrypted data to obtain the target data.
10. A data transmission device, characterized by being applied to a laser emission terminal, comprising:
the acquisition module is used for acquiring target data to be transmitted in a first period and a target vector of star light obtained by detecting star light emitted by a target star in a period previous to the first period; wherein the target vector is used for indicating the polarization state of the star light in the previous period;
the generation module is used for generating a random number sequence corresponding to the first time period according to the target vector of the star light detected in the previous time period;
the processing module is used for encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence to obtain encrypted data;
and the sending module is used for sending the encrypted data to the laser receiving terminal.
11. A data transmission apparatus, characterized by being applied to a laser receiving terminal, comprising:
the receiving module is used for receiving encrypted data of a first period sent by the laser transmitting terminal, wherein the encrypted data is a target vector of star light obtained by acquiring target data to be sent in the first period and detecting star light emitted by a target star in a period before the first period; the target vector is used for indicating the polarization state of the star light in the previous period, generating a random number sequence corresponding to the first period according to the target vector of the star light detected in the previous period, encoding the target data to obtain encoded data, and encrypting the encoded data by adopting the random number sequence.
12. An electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, the processor implementing the data transmission method according to any one of claims 1-7 or the data transmission method according to any one of claims 8-9 when executing the computer program.
13. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the data transmission method according to any one of claims 1-7 or the data transmission method according to any one of claims 8-9.
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