A Secure Device Management Scheme with Audio-Based Location Distinction in IoT

1  Introduction

With the rapid development of emerging technologies (e.g., 5G Communications and beyond [1–3], Artificial Intelligence [4–6], and Information Security [7–9]), the Internet of Things (IoT) have become an important part of people’s life and work which provide people with intelligent, secure and privacy-protected services, such as smart medical care [10,11], smart city [12], and intelligent manufacturing [13,14]. As we all know, massive smart devices are extremely important in the IoT, as they undertake a variety of high-precision and difficult tasks [15–17]. It is noted that a lot of smart devices in IoT are extremely expensive. To reduce the acquisition cost of smart devices and improve their utilization of them, a large number of smart devices have been realized as mobile and portable [18–21]. It is necessary to manage smart devices, such that they can be accurately located when we need them [22–24]. Moreover, as the number of IoT nodes continue to increase, the risks associated with malicious attacks on the IoT also continue to rise [25,26]. When an IoT device is compromised, it is critical to locate the device among the vast number of IoT devices. However, the mobility and portability of devices have brought great challenges to secure device management [27–29]. In the midst of existing challenges, identifying an IoT device and detecting a change in its position are critical challenges in many IoT applications (e.g., intelligent logistics, intelligent transportation, and intelligent manufacturing [30,31]).

There are several existing methods to realize the identification and movement detection of devices. In [32], the radio frequency identification devices (RFID) based device tracking method was proposed, in which, RFID tags can be used to identify and track devices. In this method, the devices are attached with an RFID tag, which can be identified by an RFID reader. However, using the RFID-based method requires a large number of readers. This will come at a high cost, as the RFID reader is expensive. In [33], an IoT device management system was designed by using cloud computing to realize the dynamic task scheduling of devices. In [34], a single pixel tracking system is proposed for the microfluidic device monitoring without image processing. Other related works also include [35–37], which considers the secure management of smart devices. However, both of them focus on the security in smart device management and lack device tracking.

In this paper, a device management scheme is proposed, which includes device identification and movement detection by using audio-based location distinction techniques. In our system, a set of devices 𝒟={Dev1,Dev2,…,Devs} and a set of Access Points (APs) 𝒜={AP1,AP2,…,APt} are distributed in different rooms. A sever is included in our system to manage all the devices, such as, recoding the trajectory and current position of each device, and assisting in mutual authentication between device and AP. The APs are responsible for detecting the movement of a device in their rooms, and report it to the sever for tracking devices. Both of the devices and APs are equipped with communication module based on microphone and loudspeaker. It is worth noting that these modules are extremely inexpensive [38].

The proposed scheme includes three main stages: Device Registration, Position Report, and Location Distinction. We utilize traditional cryptographic techniques to realize the integrity, authentication, and non-repudiation of information transmitted between devices, APs, and Severs. Moreover, the audio-based location distinction method is designed to identify the devices and detect the position change of them. The audio frequency response (AFR) at several frequency points are utilized as the signature of a device [39,40] to identify the devices and detect the movements because of the following features. (1) Hardware Signature: the obtained signatures of different loudspeaker and microphone pairs are difference [41]; and (2) Location Signature: the obtained signatures are completely different for different distances in the same direction and the obtained signatures are different for different directions in the same distances. To evaluate the performance of the proposed scheme, extensive experiments are conducted. In our experiments, several mobile phones (i.e., HUAWEI Mate 40, HUAWEI nova 9pro, and HUAWEI nova 9SE) are used as devices and APs. We selected 31 frequency points ranging from 10 to 16 KHz with steps length of 0.2 KHz in our experiments. Extensive experiments show that the audio-based location distinction method has a good performance in security, accuracy and energy consumption.

The main contributions of this paper are shown as follows:

•   We propose a secure IoT device management scheme with audio-based location distinction and traditional cryptographic techniques.

•   We design an audio-based location distinction method to identify the IoT devices and detect the position change of them.

•   We conduct extensive experiments to evaluate the performance of the proposed scheme. The results show that our scheme has a good performance in security, accuracy and energy consumption.

The structure of the paper is as follows. The system model is introduced in Section 2. Section 3 describes the proposed the details of IoT device management scheme. Audio-based location distinction method is discussed in Section 4. The experimental results are pretended in Section 5. Finally, Section 6 concludes this paper.

2  System Model

There are three entities involved in our system, as shown in Fig. 1, e.g., IoT device, Access Point, and Sever. Specifically, in the proposed system, there is a set of devices 𝒟={Dev1,Dev2,…,Devs}, which are distributed in different rooms. There is also a set of Access Points (APs) 𝒜={AP1,AP2,…,APt}, where each room is equipped with an AP for identifying and monitoring devices. Moreover, a sever is included in our system to manage all the devices, e.g., recoding the trajectory and current position of each device, assisting in mutual authentication between device and AP, etc. The main objective of this paper is that, the APs are responsible for detecting the movement of a device in their rooms, and report it to sever for tracking.

Figure 1: The system model

The audio frequency response (AFR) at several frequency points is used as the location signature of a device for movement detection. It is necessary to introduce the acoustic propagation model. As sound wave is a kind of energy, its energy will gradually decline with the increase of the transmission distance owing to the diffusion, absorption and scattering, when it propagates in certain medium. Actually, the received energy is related to the propagation distance, the gain of the built-in loudspeaker at sender and the built-in microphone at receiver, and the frequency of the sound wave. The acoustic attenuation model is shown as follows:

Pr(d,f)=Pt(f)Lr(f)Lt(f)e−a0d(2πf)nf(1)

where d is the distance from the sound source, f is the acoustic frequency, Pt(f) is the audio transmission power, Pr(d,f) is the audio frequency receiving power, Lr(f) is the loss of the microphone, Lt(f) is the loss of loudspeaker, nf is the attenuation factor independent of distance and related to frequency, exp is the exponential function.

The audio frequency response (AFR) at frequency point f can be defined as:

AFR(f)=20log⁡(Pr(d,f)Pt)=20log⁡[Lr(f)Lt(f)]−a0dlog⁡(e)(2πf)nf(2)

It is clear that the frequency response at f is a function of the distance between the sender and receiver, and loss at the microphone and loudspeaker. Accordingly, the set of frequency response {AFR(f1),…,AFR(fn)} at different frequency points f1, f2, … , and fn can be regarded as the hybrid signature of location and audio-hardware fingerprints. However, it is difficult for a receiver to obtain the audio transmission power Pt(fi). To solve the problem, the audio signal AudSig transmitted by sender for hybrid signature extraction can be fixed during the location distinction phase. In this case, the vector

Φ=<20log⁡Pr(d,f1),…,20log⁡Pr(d,fn)>(3)

can be used as the hybrid signature.

In our system, it is assumed that there is an adversary who is equipped with loudspeaker and microphone. The adversary can obtain all the parameters of the proposed system, know the position of a target IoT device, and access to such devices. The adversary can record the sound of the target IoT device with its loudspeaker, and launch replay attacks with its microphone through adaptive selection of the appropriate positions to trick the AP into recognizing it as the target IoT device.

3  The Proposed Scheme

3.1 Device Registration

Assumed that there is a device manager who has a handhold smart terminal device (e.g., a mobile phone) and is in charge of assisting device registration during the registration phase and inputting basic information of the devices into the server database. The manager and server have a pair of public/private key (PKM,SKM) and (PKS,SKS), respectively.

In order to register a new device Devnew with ID IDDev in the system, the manager and the sever perform the following steps:

Step 1. The manager first transmits the identification number IDM (resp. IDDev) of the manager (resp. the device), time stamp T0, and basic information of device BasicInf (e.g., model, function, price, manufacturer, etc.) to the sever with the handhold smart terminal device by using symmetric encryption algorithm AES [42] and RSA-based signcryption scheme RSA-TBOS [43] as follows:

•   Defining M=<IDM‖IDDev‖T0‖BasicInf>, the manager sends encrypted registration information

Reg=EncKsec(M)‖SignCry(Ksec‖hash(M))(4)

to the sever, where EncKsec is the encoding algorithm of AES with secret key Ksec, hash(⋅) is a hash function, and SignCry is the signcryption algorithm of RSA-TBOS.

Step 2. After receiving registration information Reg, the Sever performs the following steps to complete registration:

•   The sever checks the validity of SignCry(Ksec‖hash(M)).

•   If so, the sever can obtain the key Ksec and the hah values hash(M); if not, the registration is failed.

•   Then, the sever decrypts M from EncKsec(M), computes hash(M), and checks if the two hash values are equal.

•   If so, the sever chooses an initial section key K0 and transmits EncKsec(IDDev‖K0) to the manager, and puts M and K0 in its database; if not, the registration is failed.

Step 3. The device manager decrypts IDDev‖K0 from EncKsec(IDDev‖K0), and then transmits IDDev‖K0 to Devnew with an audio-based secure D2D communication [44,45]. The device Devnew stores the section key K0.

3.2 Position Report

If a device Devi is moved from one room (room j1) to another room (room j2), it is required to report it's position to the Sever through the APj2 in the current room as follows:

Step 1. Devi first generates a randomness R0 and transmits the encrypted report information Rep to APj:

Rep=IDDeci‖R0‖EncK0(MRep‖hash(MRep))(5)

where MRep=R0‖IDDeci‖IDAPj1‖Time, IDAPj1 is the ID of the AP in the last room, and Time is the time stamp. If Devi is in use for the first time, set IDAPj1 to null.

Step 2. After obtaining Rep from Devi, APj2 sends

RepSign=IDAPj2‖Rep‖SignAPj2(hash(IDAPj2‖Rep))(6)

where IDAPj2 is the ID of the AP in the current room, and SignAPj2(⋅) is the signature algorithm [46] with it is private key.

Step 3. When the sever received RepSign from APj2, it performs the following step to complete the location report.

•   First of all, it verifies the validity of the signature SignAPj2(hash(IDAPj2‖Rep)) with APj2’s public key.

•   Then, it obtains MRep and hash(MRep) with current session key K0 of Devi and checks the consistency between them (if not, returning Failure to Devi through APj2).

•   Finally, it verifies the consistency between IDDeci‖R0 and MRep. If so, it sends a feedback EncSK (which includes a new session key K1 for Devi) to Devi through APj2 (if not, it returns Failure to Devi through APj2), where

EncSK=EncK0(IDDevi‖IDAPj2‖K1‖hash(IDAPj2‖K1))(7)

Step 4. After receiving EncSK, Devi decrypts IDAPj2‖K1 and hash(IDAPj2‖K1) with session key K0, and checks the consistency between them. If so, Devi stores IDAPj2 and K1 (as the new session key), and sends response

EncK1(R1‖IDAPj2‖hash(R1‖IDAPj2))(8)

to sever through APj2, in which, R1 is a random number; if not, it returns Failure to sever through APj2.

Step 5. The sever decrypts R1‖IDAPj2 and hash(R1‖IDAPj2) from Devi’s response, and verifies the consistency between them. If so, the sever stores IDAPj2 as Devi’s new position, K1 as the new session key, and Time as the time stamp; if not, it reports Failure to Devi through APj2.

3.3 Location Distinction

If the device Devi has been moved in room j and finished the position report, APj needs to monitor if Devi has changed its position and report to the sever if a position change of Devi occurs. In our system, an audio-based location distinction method is proposed, and the framework of the proposed method is shown as follows:

•   Audio Signal Generation. After finishing the position report, Devi generates an audio signal AudSig and transmits it with it is loudspeaker to APj.

•   Hybrid Signature Extraction. When APj received the audio signal with it’s microphone, it extracts the fingerprints of location and hardware from the received audio signal as a hybrid signature.

•   Movement Detection. Devi intermittently sends the same audio signal AudSig to APj for signature extraction, and APj compares current signature with the previous signatures to determine whether APj has been moved.

For the details of the audio-based location distinction method, please refer to the next section.

4  Audio-Based Location Distinction Method

4.1 Location and Audio-Hardware Fingerprints

From the discussion above, the vector Φ generated from the received signal is strong correlated with audio-hardware and location. To verify the theoretic result in a real scenario, three experiments are conducted, in which the selected frequencies are from 10 to 16 KHz with the step length 0.2 KHz, and the transmitted audio signal AudSig is the sum of the sine wave at the selected frequencies (i.e., 10, 10.2, … , 16 KHz).

Hardware Signature. In the first experiment, three different smart phones are used to investigate the hardware differences, in which the phone i equipped with Loudspeakeri and Microphonei (i=1,2,3). Fig. 2 plots the vectors Φ(L1,M2), Φ(L2,M3) and Φ(L3,M3), where Φ(Li,Mj) is used to denote the obtained value of Φ with Loudspeakeri and Microphonej. As shown in Fig. 2, the hardware signatures of different loudspeaker and microphone pairs are very clear difference.

Figure 2: Hardware signature

Location Signature. In the second experiment, two smart phones (i.e., Phone 1 and Phone 2) are used to study the location differences. Fig. 3 plots the vectors Φ(L1,M2) under four different distances between sender to receiver in the same direction, in which the distances are set to 20, 40, 60, and 80 cm. From Fig. 3, the obtained vectors are completely different in different distances at the same direction. Fig. 4 shows the vectors Φ(L1,M2) in three different directions from receiver in the same distance. It can be seen that the obtained vectors are also different for different directions in the same distances. In summary, location signature of different locations for the same loudspeaker and microphone pair are completely difference.

Figure 3: Distance signature

Figure 4: Direction signature

4.2 Audio-Based Location Distinction Scheme

Based on the discussion above, a novel location distinction scheme are proposed by using the AFR. Besides being able to determine whether a node is moving with location signature, the proposed scheme can also resist node impersonation attacks with the audio hardware signature. The details of the proposed scheme is shown as follows:

Audio Signal Generation. When Devi is moved from roomi to roomj, Devi selects a sequence (α1,α2,…,αN) from [0,1] uniformly at random. And then, Devi generates an audio signal

AudSig=∑n=0Nαn∑s=0Nαssin⁡(2π(φ0+nfΔ)t)(9)

for t∈(0,T], where φ0 is the initial frequency, and f△ is the length of step. Here {f0,f1,…,fN} is the set of selected frequencies, in which fn=φ0+nfΔ for n=0,1,…,N.

Hybrid Signature Extraction. After completing the location report phase, Devi transmits audio signals

AudSig‖Chirp‖AudSig‖Chirp‖AudSig

with its loudspeaker to APj, where Chirp is a chirp signal. Note that, a chirp is a signal in which the frequency increases (called up-chirp) or decreases (called down-chirp) with time. When receiving the audio signals

AudSig^0‖Chirp^0‖AudSig^1‖Chirp^1‖AudSig^2

with the microphone, APj first extract AudSig^0, AudSig^1, and AudSig^2. Then, APj computes

Φi=20log⁡(FFT(AudSig^i))=<20log⁡Pr(d,f1i),…,20log⁡Pr(d,fni)>(10)

for i=0,1,2, where FFT(⋅) is fast discrete Fourier transform algorithm, which transforms the signals from time-domain to frequency domain. Finally, APj obtains the hybrid signature as follows:

Φ=13∑iΦi=<ϕ1,…,ϕn>

Movement Detection. When Devi sends the same audio signal AudSig‖Chirp‖AudSig‖Chirp‖AudSig to APj, APj first extracts the corresponding hybrid signature

Φ′=13∑iΦi′=<ϕ1′,…,ϕn′>

where Φi′ is the FFT result from AudSig^i (i=0,1,2). Then APj compares the current signature Φ′ with the previous signatures Φ′ with Euclidean distance:

d(Φ,Φ′)=∑i=1n(ϕi−ϕi′)2(11)

If d(Φ,Φ′) is less than a threshold Δ, then Devi is considered to be static; otherwise, Devi is considered to be moved.

4.3 Evaluation Methodology

Hypothesis testing is used to decide two hypotheses H0 or H1 is true when the outcome of the measurements is given [47]. Here, a kind of evaluation methodology based on hypothesis testing is discussed to analyse the accuracy of the proposed algorithm. We conduct an experiment to show the distribution of statistics of the Euclidean distance between signature Φ0 of Devi at time slot t0 and Φν at time slot tν in the same location, where ν=1,…,300, and the distance between Devi and APj is 60 cm. From Fig. 5, we can see that the result of this frequency statistic is approximately conforming to Gaussian distribution.

Figure 5: The distribution of statistics of the Euclidean distance between two signatures at the same position

Supposed that G(μ1,δ02) is the distribution of probability of the distance d(Φloc0(0),Φloc0(ν)) between the signature at time slot t0 in location loc0 and the signature at other time slot tν in location loc0, and G(μ1,δ12) is the distribution of probability of the distance d(Φloc0(0),Φloc1(ν)) between the signature at time slot t0 in location loc0 and the signature at other time slot tν in location loc1. Note that, the signature of Devi at location loc0 is different from the signature of Devi at location loc0 and location loc1, where loc0≠loc1. Accordingly, we have μ1>μ0. The location change detection test can be viewed then as a choice between two events H0 and H1.

H0:d(Φloc0(0),Φloc0(ν))≥ΔH1:d(Φloc0(0),Φloc1(ν))<Δ(12)

Then, the false negative probability PFN and false positive probability PFP can be expressed as

PFN=∫−∞x=Δ12πe−(x−μ1)2/2σ12dxPFP=∫x=Δ+∞12πe−(x−μ0)2/2σ02dx(13)

In order to evaluate the performance of the proposed scheme, we design an evaluation methodology as follows:

F1=2/(1/Recall+1/Precision)(14)

where Precision=TP/(TP+FP), Recall=TP/(TP+FN), TP means the number of accurate detection with no movement, and FP and FN are the number of false positive error and false negative error, respectively. Specifically, when F1 is calculated to be 1, it means there is no false negative alarm.

5  Experimental Verification

In this section, extensive experiments are conducted to verify the performance of the proposed scheme.

5.1 Experimental Environment

In our experiments, several mobile phones (i.e., HUAWEI Mate 40, HUAWEI nova 9pro, and HUAWEI nova 9SE) are used as devices and APs. Note that, due to the limitation of hardware, the maximum frequency of sound produced by a mobile phone is about 16 KHz. Therefore, it selected 31 frequency points ranging from 10 to 16 KHz with steps length of 0.2 KHz in our experiments.

The position change diagram of the device in the experiments is shown in the Fig. 6. We consider the changing of starting position of the device from the 20 to 100 cm with step-length 20 cm in four different directions, where the AP is on the central position. In other words, there are five points for each direction, and each point is 20, 40, 60, 80, and 100 cm away from the central position. The AP records the sound signal from the device to get the 31 results after FFT transformation for each period of time, and then, calculates the Euclidean distance of link signature according to the obtained value. Moreover, we found that the fading of high frequency band is too fast. In order to average the granularity of each frequency, we refer to the experimental test and influence factors of acoustic attenuation model, and change the frequency weight to exponential growth from low frequency to high frequency.

Figure 6: The position change diagram of the device in the experiments

5.2 Threshold Selection

First of all, we discuss how to determine the threshold of the proposed location distinction method. From Figs. 2–4, we have the conclusion that the location signatures have two properties: the aggregation with time difference and the separation with space difference. The conclusion shows that finding a threshold of movement detection is possible.

An experiment is conducted to obtain the Euclidean distance of two signatures under different distance change between device and AP with 20 cm as the step length in each direction. As shown in Fig. 7, the solid black dot means the Euclidean distance of two signatures of the starting position; the red square means the Euclidean distance of two signatures in the starting position and the position at 20 cm, respectively; the red star means the Euclidean distance of two signatures in the starting position and the position at 40 cm, respectively; the blue triangle means the Euclidean distance of two signatures in the starting position and the position at 60 cm, respectively; the green diamond means the Euclidean distance of two signatures in the starting position and the position at 80 cm, respectively; the black circle means the Euclidean distance of two signatures in the starting position and the position at 100 cm, respectively. From this figure, we can find that the Euclidean distance of two signatures increases as the distance between measured positions increases.

Figure 7: Threshold discussion

In order to obtain a fixed threshold suitable for all distances, the F1 score is studied over a varying threshold under different starting positions. As shown in Fig. 8, we plot the effect of different threshold increments on F1 score under different starting positions. From this figure, it can be seen that, when Δ=15, F1 scores are 1 for different starting positions. It should be noted that, when Δ=15, the false positive alarm is likely to happen. If Δ is set to be 30, there is only one false positive alarm in all the tests. However, the proposed scheme will be less sensitive to movement perception. For instance, in case that the starting position is 40 cm in direction 1, the proposed scheme can detect a movement when the movement distance is up to 40 cm.

Figure 8: The impact of the value of the threshold on the detection performance

5.3 Replay Attack Analysis

Now we discuss the adversary’s replay attacks with an experiment. Assumed that a legitimate device is located 20, 40, and 60 cm in direction 1, and an adversary is located at 5 cm before and after these three points. In this experiment, the adversary records and replays the sound of the legitimate device. The experimental result is shown in Fig. 9, in which the threshold is set to 15. The blue line combination is the sum of the signature of the legitimate device. We can see in the figure that its separation from the purple and black lines from the recording playback of the adversary. By comparing the threshold with the Euclidean distance between signatures from the legitimate device and adversary, it is found that the attack inefficiency is 100%. This test verifies the proposed scheme can against recording replay attacks.

Figure 9: Adversary’s replay attacks

Assumed that the adversary can obtain the original position and the original audio from the legitimate device, an experiment is conduct as follows. A mobile phone is used as the legitimate device at the position 20 cm in direction 1, and another mobile phone is used as the adversary at the position 20 and 2 cm before and after, and 2 cm around. Fig. 10 plots the Euclidean distance of the signature of legitimate device and the signature of adversary at different positions in different time slots. In this figure, the middle red line is the threshold. The experimental results show that all attacks failed, although the Euclidean distance between the signature of legitimate device and the signature of adversary at the original position is the closest one to the threshold.

Figure 10: Attacks analysis when the adversary can obtain the original position and the original audio from the legitimate device

5.4 Performance

In order to study the performance of the proposed scheme, an experiment is conducted, in which, the distance between the device and the AP is ±20, ±40 and ±60 cm, the movement distance is 5, 10 and 20 cm, and the threshold is set to 25, where −20, −40 and −60 cm means the opposite direction of distance 20, 40 and 60 cm between the device and the AP, respectively. The experimental results are shown in Fig. 11. It can be seen that, the difference of signatures at the same position over different time slots can be confirmed with 100% accuracy. It can also be seen that the accuracy gradually increases with the increasing movement distance, i.e., a larger movement distance means a more accuracy movement detection. Specifically, it is found that when the movement distance is up to 60 cm, all the device movement can be accurately detected.

Figure 11: The performance of the proposed scheme

To further discuss the performance, we test the proposed scheme by selecting three places that are very common in daily life, and the noise level ranged from high to low: restaurants, supermarkets and classrooms. In this experiment, the AP is 100 cm away from the device in the direction 1, and 1000 groups of tests are performed for each place, in which the first 500 groups of talking phones do not move and the last 500 groups of talking phones move 30 cm away. The test results are shown in the Fig. 12. It can be seen that, whether in a noisy restaurant or a quiet classroom, the proposed scheme can identify whether a device to move with a 100% probability, which is perfectly in line with the expectation.

Figure 12: The test of the proposed scheme over restaurants, supermarkets and classrooms

Finally, we conduct an experiment to evaluate the energy consumption compared with several common APPs on mobile phones in the Fig. 13. In this experiment, all applications are turned off except the test software. We measure the power consumption of the proposed scheme and other applications (i.e., NetEases could music, QQ music, QQ, and Microblog) within one hour to verify the efficiency of the software. We can see that the power consumption of the proposed scheme is more than 30 times lower than that of similar music playing software, 18 times lower than that of chat tool software, and 40 times lower than that of video and picture browsing software.

Figure 13: The energy consumption of the proposed scheme compared with several common APPs

Discussion. The disadvantage of the proposed scheme is that the transmission of high-frequency sound waves may disturb nearby people. Possible solutions include replacing mixed sine-wave signals with melodious mid-to-high frequency music or using ultrasonic frequencies to send and receive acoustic signals.

6  Conclusion

In this paper, a secure device management scheme with audio-based location distinction in IoT has been proposed by utilizing traditional cryptographic techniques. In our scheme, the traditional cryptographic techniques are utilized to realize the integrity, authentication, and non-repudiation of information transmitted between devices, APs, and Severs; and the audio-based location distinction method is designed for identifying the devices, as well as detecting the position change of them. The audio frequency response (AFR) at several frequency points is utilized as the signature of a device to identify the devices and detect the movements. To evaluate the performance of the proposed scheme, extensive experiments are conducted. The experimental results show that the proposed scheme has a good performance in security, accuracy and energy consumption. Future research directions include implementing the designed method using ultrasound and verifying the validity of the method in a real IoT scenario, such as the Internet of Medicine (IoM).

Acknowledgement: Authors thank editors and reviewers for helping the enrichment of this article.

Funding Statement: This work is supported by Demonstration of Scientific and Technology Achievements Transform in Sichuan Province under Grant 2022ZHCG0036, National Natural Science Foundation of China (62002047).

Author Contributions: Study conception and design: Haifeng Lin, Mingsheng Cao; data collection: Xiangfeng Liu, Chen Chen; analysis and interpretation of results: Zhibo Liu, Dexin Zhao; draft manuscript preparation: Yiwen Zhang, Weizhuang Li. All authors reviewed the results and approved the final version of the manuscript.

Availability of Data and Materials: Not available.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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