CN110519291B - Data transmission authentication method and system based on edge calculation and channel correlation - Google Patents
Data transmission authentication method and system based on edge calculation and channel correlation Download PDFInfo
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- CN110519291B CN110519291B CN201910832490.4A CN201910832490A CN110519291B CN 110519291 B CN110519291 B CN 110519291B CN 201910832490 A CN201910832490 A CN 201910832490A CN 110519291 B CN110519291 B CN 110519291B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
Abstract
The invention discloses a data transmission authentication method and a data transmission authentication system based on edge calculation and channel correlation, wherein the method comprises the following steps: s1, initial authentication: when the terminal node and the edge calculation server carry out data transmission, the edge calculation server carries out upper layer authentication on an initial data packet, extracts corresponding channel information as reference channel information of the data packet authentication, and determines a correlation coefficient threshold value at the same time; s2, calculating the channel correlation of the channel information: when the edge computing server receives a new continuous data frame, extracting the channel information of the current data frame and computing the channel correlation coefficient of the channel information corresponding to the previous frame data packet; s3, judging the validity of the continuous data frames: the validity of successive data frames is checked by means of a binary hypothesis. The method carries out authentication and identification on the data frame based on the channel correlation, and has the advantages of low calculation complexity and high data authentication accuracy.
Description
Technical Field
The invention relates to security authentication protection of data transmission, in particular to a data transmission authentication method and system based on edge calculation and channel correlation.
Background
With the rapid development of the internet of things technology, various terminal devices widely applied will generate massive data. The traditional cloud computing system cannot meet practical requirements in the aspects of matching massive edge data, real-time control, network traffic load, cloud data privacy safety and the like, and a newly-emerging edge computing technology for executing computing on the edge side of a network just can provide edge intelligent services for Internet of things equipment. The edge computing server is close to the terminal node, and the access nodes are numerous and are easy to be attacked. The security and privacy protection of data transmission between the communication terminal node and the edge computing server are the key points of application, and if the security of the data cannot be guaranteed, the system has no practical significance, so that a data transmission security protection authentication scheme suitable for an edge computing scene is needed to be designed.
The high strength of the traditional data security and privacy protection based on cryptography faces large computational complexity, so that terminal nodes with limited energy and computing capacity are difficult to adopt, the computing resources and the like of the edge computing server are far inferior to those of a cloud computing system, and the traditional data security and privacy protection based on cryptography cannot meet practical requirements. The physical layer channel characteristic authentication is to utilize the space-time uniqueness of channel information, directly extract the channel characteristic information from a received data packet and realize the authentication by comparing the similarity of the channel characteristics; the method does not need complex upper layer encryption and decryption operation, has the advantages of high speed and high efficiency, and is very suitable for the legality authentication of the lightweight data packet under the edge computing system. Compared with a cloud computing system, the edge computing server is close to the terminal node, and the terminal node transmits the data packet to the edge computing server in a short distance, so that the distortion of the channel information carried by the data packet is small when the data packet reaches the edge server, and the extraction is easy. The channel information contains rich characteristics, and the channel characteristics carried by the data frame in the coherence time have high correlation, so the channel correlation of the channel information is a statistical index which can better reflect the change of the channel characteristics.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a data transmission authentication method and a data transmission authentication system based on edge calculation and channel correlation.
The purpose of the invention is realized by the following technical scheme: the data transmission authentication method based on the edge calculation and the channel correlation comprises the following steps:
s1, initial authentication: when the terminal node and the edge calculation server carry out data transmission, the edge calculation server carries out upper layer authentication on an initial data packet, extracts corresponding channel information as reference channel information of the data packet authentication, and determines a correlation coefficient threshold value at the same time;
s2, calculating the channel correlation of the channel information: when the edge computing server receives a new continuous data frame, extracting the channel information of the current data frame and computing the channel correlation coefficient of the channel information corresponding to the previous frame data packet;
s3, judging the validity of the continuous data frames: the validity of successive data frames is checked by means of a binary hypothesis:
if the channel correlation of the current data frame is greater than the correlation coefficient threshold value, the current data frame is legal, the edge calculation server receives the data frame, replaces old reference channel information with the channel information of the current data frame, and returns to the step S2 to perform channel correlation calculation on the next frame data packet;
if the channel correlation of the current data frame is smaller than the correlation coefficient threshold value and the current data frame is illegal, the edge calculation server discards the data frame and returns to the step S1 to perform the initial authentication again.
Wherein the step S1 includes the following substeps:
s101, when the terminal node transmits data with the edge computing server, the edge computing server performs upper layer authentication on the previous 2 frame data packets:
if the authentication fails, directly discarding the previous two frames of data packets, returning to the step S101, and taking the next frame of data packet as the 1 st frame of data packet (setting the index of the next frame of data packet to be 1) to continue the upper layer authentication;
if the continuous 2 frame data packets are successfully authenticated, the edge server receives the 2 frame data packets, and extracts the corresponding channel according to the received signal waveformInformation
Wherein the content of the first and second substances,
representing channel information from the terminal node to the edge calculation server extracted from the signal waveform of the 1 st frame data packet;
indicating channel information of the terminal node to the edge calculation server extracted from the signal waveform of the 2 nd frame data packet,
a plurality of matrixes which are m rows and 1 column;
s102, calculating an initial channel correlation coefficient rho:
wherein the content of the first and second substances,
is composed of
The covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
The correlation coefficient of (a), is a complex number,
presentation pair
Carrying out a mould taking operation;
s103, determining a threshold value of a correlation coefficient threshold, namely combining the rho with η0Making a comparison if p is less than η0Then η will be0Set as the threshold value of the authenticated correlation coefficient threshold, i.e. let η be η0If ρ is greater than η0Then ρ is set as the threshold value for determining correlation coefficient threshold for authentication, i.e. η is made equal to ρ, where η is the threshold value for determining correlation coefficient threshold for data frame authentication, η0And (4) setting a correlation coefficient threshold value for the system initially.
Preferably, the method adopted by the upper layer authentication includes, but is not limited to, a symmetric cryptographic algorithm and an asymmetric cryptographic algorithm, and the method adopted by the channel information extraction includes, but is not limited to, a least square channel estimation algorithm and a minimum mean square error channel estimation algorithm.
The step S2 includes the following sub-steps:
s201, when the edge computing server receives the data of the (k + 1) th frame, k is an integer not less than 2, and corresponding channel information is extracted
S202, calculating
Correlation of (2)
Wherein the content of the first and second substances,
for channel information
The covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
The correlation coefficient of (a), is a complex number,
presentation pair
And carrying out a modulus taking operation.
The step S3 includes the following sub-steps:
edge compute server passing binary assumptions
And checking the validity of the continuous data frames, wherein η represents a threshold decision threshold of a correlation coefficient of data frame authentication:
null hypothesis
When rhok< η, indicating channel information
Is less than the correlation coefficient gateLimiting the decision threshold value, wherein the (k + 1) th frame data packet is illegal, discarding the data frame by the edge computing server and returning to the step S1, taking the next frame data packet as the 1 st frame data packet (setting the index of the next frame data packet to be 1), and performing the initial authentication and the reference channel information extraction again;
alternative assumptions
When rhokWhen > η, the channel information is expressed
The correlation is greater than the threshold decision threshold of the correlation coefficient, i.e. the channel information
Highly correlated, k +1 th frame data is legally wrapped, and the edge calculation server receives the data frame and then uses the new channel information
Replacing old reference channel information
The process returns to step S2 to calculate the channel correlation coefficient of the next frame data packet.
The data transmission authentication system based on the edge calculation and the channel correlation comprises an edge calculation server and terminal equipment connected with the edge calculation server through a network;
the terminal equipment is used for interacting with the edge computing server to realize data transmission to the edge computing server;
and the edge calculation server is used for interacting with the terminal equipment, finishing initial data packet authentication with the terminal equipment based on upper layer authentication, determining a correlation coefficient threshold value, and verifying the validity of continuous data packets by realizing physical layer channel authentication based on channel correlation.
Wherein the edge computing server comprises:
the initial authentication establishing and authenticating module is used for performing upper-layer authentication on an initial data packet when receiving data from the terminal equipment, extracting corresponding channel information as a reference of the data packet authentication, and determining a correlation coefficient threshold value;
the channel correlation calculation module is used for extracting the channel information of the current data frame and calculating the channel correlation of the channel information corresponding to the legal data packet of the previous frame when receiving the new continuous data frame;
the data frame validity judging module is used for checking the validity of the continuous data frames through a binary hypothesis: judging whether the channel correlation of the current data frame is greater than a correlation coefficient threshold judgment threshold value, judging that the current data frame is legal, receiving the data frame, replacing old reference channel information with the channel information of the current data frame, and continuing to authenticate the next frame data; and judging that the current data frame is illegal when the channel correlation of the current data frame is smaller than the correlation coefficient threshold judgment threshold, discarding the data frame, and performing initial authentication again.
The invention has the beneficial effects that: the edge computing server extracts the channel information when receiving the signal, verifies the legality of the data frame based on the channel correlation of the channel information, has the advantages of low computing complexity and high data authentication accuracy, and improves the security of system authentication data; in the edge computing system with numerous access nodes and low computing resources, the data packet transmitted between the edge computing server and the terminal node is quickly and accurately authenticated, and the method is very suitable for real-time application of large-scale terminal mass data in an edge computing scene.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a diagram illustrating a success rate of data authentication based on channel correlation according to an embodiment;
fig. 3 is a schematic block diagram of the system of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, the data transmission authentication method based on edge calculation and channel correlation includes the following steps:
s1, initial authentication: when the terminal node and the edge calculation server carry out data transmission, the edge calculation server carries out upper layer authentication on an initial data packet, extracts corresponding channel information as reference channel information of the data packet authentication, and simultaneously determines a correlation coefficient threshold value:
wherein the step S1 includes the following substeps:
s101, when the terminal node transmits data with the edge computing server, the edge computing server performs upper layer authentication on the previous 2 frame data packets:
if the authentication fails, directly discarding the previous two frames of data packets, returning to the step S101, and taking the next frame of data packet as the 1 st frame of data packet (setting the index of the next frame of data packet to be 1) to continue the upper layer authentication;
if the continuous 2 frame data packets are successfully authenticated, the edge server receives the 2 frame data packets, and extracts corresponding channel information according to the received signal waveform
Wherein the content of the first and second substances,
representing channel information from the terminal node to the edge calculation server extracted from the signal waveform of the 1 st frame data packet;
indicating channel information of the terminal node to the edge calculation server extracted from the signal waveform of the 2 nd frame data packet,
a plurality of matrixes which are m rows and 1 column;
s102, calculating an initial channel correlation coefficient rho:
wherein the content of the first and second substances,
is composed of
The covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
The correlation coefficient of (a), is a complex number,
presentation pair
Carrying out a mould taking operation;
s103, determining a threshold value of a correlation coefficient threshold, namely combining the rho with η0Making a comparison if p is less than η0Then η will be0Set as the threshold value of the authenticated correlation coefficient threshold, i.e. let η be η0If ρ is greater than η0Then ρ is set as the threshold value for determining correlation coefficient threshold for authentication, i.e. η is made equal to ρ, where η is the threshold value for determining correlation coefficient threshold for data frame authentication, η0And (4) setting a correlation coefficient threshold value for the system initially.
In an embodiment of the present application, the upper layer authentication may be an authentication algorithm using a password, including but not limited to a symmetric cryptographic algorithm and an asymmetric cryptographic algorithm: RC4, AES, ECC, etc.; . The channel information extraction method includes, but is not limited to, a least square channel estimation algorithm, a minimum mean square error channel estimation algorithm, an algorithm for improving optimization thereof, and the like.
S2, calculating the channel correlation of the channel information: when the edge computing server receives a new continuous data frame, extracting the channel information of the current data frame and computing the channel correlation coefficient of the channel information corresponding to the previous frame data packet;
s3, judging the validity of the continuous data frames: the validity of successive data frames is checked by means of a binary hypothesis:
if the channel correlation of the current data frame is greater than the correlation coefficient threshold value, the current data frame is legal, the edge calculation server receives the data frame, replaces old reference channel information with the channel information of the current data frame, and returns to the step S2 to perform channel correlation calculation on the next frame data packet;
if the channel correlation of the current data frame is smaller than the correlation coefficient threshold value and the current data frame is illegal, the edge calculation server discards the data frame and returns to the step S1 to perform the initial authentication again.
For the 3 rd frame data, the steps S2 to S3 are performed as follows: when the edge computing server receives the data packet of the 3 rd frame, corresponding channel information is extracted
Then according to the channel information obtained in step S1
Calculating channel correlation coefficients
Wherein the content of the first and second substances,
for channel information
The covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
The correlation coefficient of (a), is a complex number,
presentation pair
Carrying out a mould taking operation; by binary assumptions
Verifying the validity of the continuous data frames, wherein η represents a threshold decision threshold of correlation coefficient for data frame authentication, and zero hypothesis
When rho2< η, indicating channel information
If the correlation is smaller than the threshold of the correlation coefficient threshold, the 3 rd frame data packet is illegal, the edge calculation server discards the data frame (sets the index of the next frame data packet to 1) and returns to step S1; alternative assumptions
When rho2When > η, the channel information is expressed
The correlation is greater than the threshold decision threshold of the correlation coefficient, i.e. the channel information
Highly correlated, frame 3 data is encapsulated, the edge calculation server receives the data frame and uses the new channel information
Replacing old reference channel information
Returning to step S2 to calculate the channel correlation coefficient of the next frame data packet;
similarly, for the k +1 th frame data, the steps S2 to S3 are performed as follows: when the edge calculation server receives the data of the (k + 1) th frame, k is an integer not less than 2, and corresponding channel information is extracted
Computing
Correlation of (2)
Wherein the content of the first and second substances,
for channel information
The covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
The correlation coefficient of (a), is a complex number,
presentation pair
Carrying out a mould taking operation;
by binary assumptions
Verifying the validity of the continuous data frames, wherein η represents a threshold decision threshold of correlation coefficient for data frame authentication, and zero hypothesis
When rhok< η, indicating channel information
If the correlation is smaller than the threshold value of the correlation coefficient threshold, the (k + 1) th frame data packet is illegal, the edge calculation server discards the data frame (sets the index of the next frame data packet to be 1), and performs the initial authentication and the reference channel information extraction again. In fact, when k is 2, it is the processing mode of the 3 rd frame data;
alternative assumptions
When rhokWhen > η, the channel information is expressed
The correlation is greater than the threshold decision threshold of the correlation coefficient, i.e. the channel information
Highly correlated, k +1 th frame data is legally wrapped, and the edge calculation server receives the data frame and then uses the new channel information
Replacing old reference channel information
The process returns to step S2 to calculate the channel correlation coefficient of the next frame data packet.
As shown in fig. 2, which is a schematic diagram of a success rate of data authentication based on channel correlation in the embodiment, it can be seen that, in different industrial scenarios, the data transmission security authentication method based on channel correlation of the present invention has a higher success rate of data authentication of physical layer channel. The terminal equipment has the characteristics of intermittence, continuity in short time and the like when sending data; in the coherent time, the channel information carried by the data frame is approximately the same; when the terminal equipment moves to the replacement position, the channel information also changes; the channel information is different even if different devices are in the same location. The validity of the data frame is verified based on the channel correlation of the channel information, the method has the advantages of low calculation complexity and high data authentication accuracy, is suitable for a real-time edge calculation application scene of massive data of a large-scale terminal, can quickly verify the validity of a data packet, and can improve the safety of system authentication data.
As shown in fig. 3, the data transmission authentication system based on edge calculation and channel correlation includes an edge calculation server and a terminal device connected to the edge calculation server through a network;
the terminal equipment is used for interacting with the edge computing server to realize data transmission to the edge computing server;
and the edge calculation server is used for interacting with the terminal equipment, finishing initial data packet authentication with the terminal equipment based on upper layer authentication, determining a correlation coefficient threshold value, and verifying the validity of continuous data packets by realizing physical layer channel authentication based on channel correlation.
Wherein the edge computing server comprises:
the initial authentication establishing and authenticating module is used for performing upper-layer authentication on an initial data packet when receiving data from the terminal equipment, extracting corresponding channel information as a reference of the data packet authentication, and determining a correlation coefficient threshold value;
the channel correlation calculation module is used for extracting the channel information of the current data frame and calculating the channel correlation of the channel information corresponding to the legal data packet of the previous frame when receiving the new continuous data frame;
the data frame validity judging module is used for checking the validity of the continuous data frames through a binary hypothesis: judging whether the channel correlation of the current data frame is greater than a correlation coefficient threshold judgment threshold value, judging that the current data frame is legal, receiving the data frame, replacing old reference channel information with the channel information of the current data frame, and continuing to authenticate the next frame data; and judging that the current data frame is illegal when the channel correlation of the current data frame is smaller than the correlation coefficient threshold judgment threshold, discarding the data frame, and performing initial authentication again.
In conclusion, the method is simple and flexible, does not depend on a third-party authentication mechanism, solves the problem of initially setting the judgment threshold value, and can resist common attacks such as replay, impersonation, eavesdropping, tampering and the like; the edge computing server extracts the channel information when receiving the signals, verifies the legality of the data frame based on the relevance of the channel information, solves the real-time application problem in the edge computing scene of massive data of a large-scale terminal, has the advantages of low computing complexity and high data authentication accuracy, and improves the security of system authentication data.
Finally, it is to be understood that the foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limited to the forms disclosed herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein and other features and advantages disclosed herein as well as those skilled in the relevant art and equivalents thereof. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The data transmission authentication method based on edge calculation and channel correlation is characterized in that: the method comprises the following steps:
s1, initial authentication: when the terminal node and the edge calculation server carry out data transmission, the edge calculation server carries out upper layer authentication on an initial data packet, extracts corresponding channel information as reference channel information of the data packet authentication, and determines a correlation coefficient threshold value at the same time;
s2, calculating the channel correlation of the channel information: when the edge computing server receives a new continuous data frame, extracting the channel information of the current data frame and computing the channel correlation coefficient of the channel information corresponding to the previous frame data packet;
s3, judging the validity of the continuous data frames: the validity of successive data frames is checked by means of a binary hypothesis:
if the channel correlation of the current data frame is greater than the correlation coefficient threshold value, the current data frame is legal, the edge calculation server receives the data frame, replaces old reference channel information with the channel information of the current data frame, and returns to the step S2 to perform channel correlation calculation on the next frame data packet;
if the channel correlation of the current data frame is smaller than the correlation coefficient threshold value and the current data frame is illegal, the edge calculation server discards the data frame and returns to the step S1 to perform the initial authentication again.
2. The data transmission authentication method based on edge calculation and channel correlation according to claim 1, wherein: the step S1 includes the following sub-steps:
s101, when the terminal node transmits data with the edge computing server, the edge computing server performs upper layer authentication on the previous 2 frame data packets:
if the authentication fails, directly discarding the previous two frames of data packets, returning to the step S101, and taking the next frame of data packet as the 1 st frame of data packet to continue the upper layer authentication;
if the continuous 2 frame data packets are successfully authenticated, the edge server receives the 2 frame data packets, and extracts corresponding channel information according to the received signal waveform
And
wherein the content of the first and second substances,
representing channel information from the terminal node to the edge calculation server extracted from the signal waveform of the 1 st frame data packet;
indicating channel information of the terminal node to the edge calculation server extracted from the signal waveform of the 2 nd frame data packet,
and
a plurality of matrixes which are m rows and 1 column;
s102, calculating an initial channel correlation coefficient rho:
wherein the content of the first and second substances,
is composed of
And
the covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
And
the correlation coefficient of (a), is a complex number,
presentation pair
Carrying out a mould taking operation;
s103, determining a threshold value of a correlation coefficient threshold, namely combining the rho with η0Making a comparison if p is less than η0Then η will be0Set as the threshold value of the authenticated correlation coefficient threshold, i.e. let η be η0If ρ is greater than η0Set ρ to be the correlation of authenticationCoefficient threshold decision threshold, i.e. let η be ρ, where η is correlation coefficient threshold decision threshold for data frame authentication, η0And (4) setting a correlation coefficient threshold value for the system initially.
3. The data transmission authentication method based on edge calculation and channel correlation according to claim 1, wherein: the method adopted by the upper layer authentication includes but is not limited to a symmetric cryptographic algorithm and an asymmetric cryptographic algorithm, and the method adopted by the channel information extraction includes but is not limited to a least square channel estimation algorithm and a minimum mean square error channel estimation algorithm.
4. The data transmission authentication method based on edge calculation and channel correlation according to claim 1, wherein: the step S2 includes the following sub-steps:
s201, when the edge computing server receives the data of the (k + 1) th frame, k is an integer not less than 2, and corresponding channel information is extracted
S202, calculating
And
correlation of (2)
Wherein the content of the first and second substances,
for channel information
And
the covariance of (a) of (b),
is composed of
The variance of (a) is determined,
is composed of
The variance of (a) is determined,
is composed of
And
the correlation coefficient of (a), is a complex number,
presentation pair
And carrying out a modulus taking operation.
5. The data transmission authentication method based on edge calculation and channel correlation as claimed in claim 4, wherein: the step S3 includes the following sub-steps:
edge compute server passing binary assumptions
And checking the validity of the continuous data frames, wherein η represents a threshold decision threshold of a correlation coefficient of data frame authentication:
null hypothesis
When rhok< η, indicating channel information
And
if the correlation is smaller than the threshold value of the correlation coefficient threshold, the (k + 1) th frame data packet is illegal, the edge calculation server discards the data frame and returns to the step S1, and the next frame data packet is used as the 1 st frame data packet to perform the initial authentication and the reference channel information extraction again;
alternative assumptions
When rhokWhen > η, the channel information is expressed
And
the correlation is greater than the threshold decision threshold of the correlation coefficient, i.e. the channel information
And
highly correlated, k +1 th frame data is legally wrapped, and the edge calculation server receives the data frame and then uses the new channel information
Replacing old reference channel information
The process returns to step S2 to proceed to the next stepAnd calculating the channel correlation coefficient of the frame data packet.
6. Data transmission authentication system based on edge calculation and channel correlation, characterized by: the system comprises an edge computing server and terminal equipment connected with the edge computing server through a network;
the terminal equipment is used for interacting with the edge computing server to realize data transmission to the edge computing server;
the edge computing server is used for interacting with the terminal equipment, finishing initial data packet authentication with the terminal equipment based on upper layer authentication, determining a correlation coefficient threshold value, and realizing physical layer channel authentication based on channel correlation to verify the validity of continuous data packets;
the edge computing server includes:
the initial authentication establishing and authenticating module is used for performing upper-layer authentication on an initial data packet when receiving data from the terminal equipment, extracting corresponding channel information as a reference of the data packet authentication, and determining a correlation coefficient threshold value;
the channel correlation calculation module is used for extracting the channel information of the current data frame and calculating the channel correlation of the channel information corresponding to the legal data packet of the previous frame when receiving the new continuous data frame;
the data frame validity judging module is used for checking the validity of the continuous data frames through a binary hypothesis: judging whether the channel correlation of the current data frame is greater than a correlation coefficient threshold judgment threshold value, judging that the current data frame is legal, receiving the data frame, replacing old reference channel information with the channel information of the current data frame, and continuing to authenticate the next frame data; and judging that the current data frame is illegal when the channel correlation of the current data frame is smaller than the correlation coefficient threshold judgment threshold, discarding the data frame, and performing initial authentication again.
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