A Novel Hybrid Deep Learning Framework for Intrusion Detection Systems in WSN-IoT Networks

M. Maheswari; R. Karthika

doi:10.32604/iasc.2022.022259

1Vels Institute of Science, Technology and Advanced Studies, Chennai, 600117, India
2SRM Institute of Science and Technology, Chennai, 603203, India
*Corresponding Author: M. Maheswari. Email: maheswam@srmist.edu.in
Received: 02 August 2021; Accepted: 07 November 2021

Abstract: With the advent of wireless communication and digital technology, low power, Internet-enabled, and reconfigurable wireless devices have been developed, which revolutionized day-to-day human life and the economy across the globe. These devices are realized by leveraging the features of sensing, processing the data and nodes communications. The scale of Internet-enabled wireless devices has increased daily, and these devices are exposed to various cyber-attacks. Since the complexity and dynamics of the attacks on the devices are computationally high, intelligent, scalable and high-speed intrusion detection systems (IDS) are required. Moreover, the wireless devices are battery-driven; implementing them would consume more energy, weakening the accuracy of detecting the attacks. Hence the design of the IDS is required, which has to establish the good trade-offs between Energy and accuracy. This research includes the Multi-tiered Intrusion Detection (MDIT) with hybrid deep learning models for improved detection accuracy in wireless networks; spotted hyena optimization (SHO) and Long short-term memory (LSTM) have been studied to design IDS effectively. Extensive experimentation has been carried out in real-time scenarios using the Node MCU Embedded boards and standard benchmarks such as CIDDS-001, UNSWNB15 and KDD++ datasets compared with the other traditional and existing learning models. The average prediction accuracy of 99.89% for all datasets has been achieved. The results show that the proposed system guarantees a high detection accuracy and reduces the prediction time, making this system suitable for resource-constrained IP-enabled wireless devices.

Keywords: Internet-enabled; reconfigurable wireless devices; spotted hyena optimizer; long short term memory; node MCU; multi-tier architecture

Internet of Things (IoT) enabled Wireless Sensor Networks (WSN) are finding their various applications such as health care [1], consumer electronics [2] and even image transmission [3]. The increased connectivity between the networks, more extensive deployment of these devices, and the broadcasting nature of communication make the devices vulnerable to different attacks, resulting in casualties in the network [4].

Nowadays, these intrusion detection systems have changed their face of dimension with an application of artificial intelligence (AI), especially of machine learning (ML) and deep learning (DL) applied to both attack and defence measures in IP enabled wireless networks. These algorithms provide defence strategies and resistance against security threats to prevent and minimize the impacts or casualties adaptively. Many machine learning and deep learning models have applied intrusion detection [5–7], malware detection [8–11], cyber-physical attacks [12–14] and data privacy protection [14].

In machine learning models, neural networks offer many advantages such as self-learning, proper classification, scalability, which have prompted researchers to investigate the intrusion detection systems based on neural networks and have achieved more excellent detection performance. As of late, Extreme Learning Machines (ELM), considered single feedforward neural networks (SLFNN), have gained popularity in designing the IDS for efficient detection of various attacks in the wireless networks [15]. Also, Wenjie et al. [16] proposed the new Kernelized Extreme Learning Machine (KELM) methodology, which has overcome the drawbacks of traditional extreme learning machines and has shown more compelling results in time and accuracy. These algorithms fail to detect different categories of attacks in networks and have not been tested in real-time. The handling of more attacks leads to complex data formation, which leads to the misclassification of attacks. Many deep learning models such as Convolutional Neural Networks (CNN) and Recurrent Neural Networks (RNN) have been proposed to detect intrusion systems, giving better accuracy in detection and reducing false alarm rates to overcome this problem [17–22]. Researchers have suggested and tested high performance deep learning algorithms such as Channel Boosted Residual Convolutional Neural networks (CBR-CNN) [23], Improved Genetic algorithm optimized Deep learning models [24], and ensemble deep learning models [25,26]. Some are CICIS2017, UNSW NB15, NSL-KDD++ datasets found suitable for accurate detection of attacks.

The deep learning methods were applied in the Internet of Things to identify the malicious nodes. The deep learning model was applied to improve the efficiency of the detection. However, the most existing deep learning-based IDS have difficulty in applying intrusion detection for real-world environments. The implementation in the real world scenario has resulted in a higher miscalculation rate. Hence the intelligent system is required for solving the real-world attacks in the WSN-IoT environment. This research article proposes the novel SHOLEN-IDS (Spotted Hyena Optimized Long Efficient Networks), multi-tier architecture.

Christopher et al. developed two intelligent investigation techniques for WSN intrusion detection. The model was developed based on the backpropagation of the Support Vector Machine (SVM) supervised classifier module. The method is deployed in the investigation of six types of cyber threats. The dataset used is NSL-KDD data. The advantage of the model is that it holds good for low sample sizes and provides highly accurate favourable detection rates. The drawback is that it suits less sample size linked with the FPR rate of less than 1% [27].

Almomani et al. proposed and formulated a benchmark dataset for detecting four significant cyber-attacks. The attacks include Blackhole, Grayhole, Flooding and Scheduling attacks. The LEACH protocol is employed as a routing protocol in the WSN network. The dataset developed when analyzed by the NS-2 simulator illustrates about 23 features. The dataset is named WSN-DS. The Artificial Neural Network (ANN) model helps in the detection and classification of attacks. WEKA toolbox helps in the validation of the dataset. It excludes the wormhole or Sybil attacks [28].

Anthi et al. introduced a threefold intrusion detection model. The module aids in the supervised detection of weak links in IoT networks. Initially, the type and the behaviour of devices connected to the IoT link of interest were classified. Malicious packs are identified, which can cause attacks on the network in the second stage. In the third stage, the attacks were categorized. This scheme is deployed to identify 12 attacks in 4 IoT network links [29].

Chaabouni et al. performed a detailed survey classifying the IoT attacking threats and the challenges. The survey mainly attempted studying the machine learning approaches for tracking the attacks with their accuracy rates. The survey shows that drastic improvement is accomplished in tracking intrusion by machine learning than traditional techniques [30].

Yin et al. proposed a learning model for intrusion detection systems based on the Recurrent Neural Network (RNN) model. The model tracks the attack based on binary classification and multilevel classification. The accuracy is higher than most machine learning algorithms such as ANN, Random Forest Model, and SVM [31].

Fig. 1 shows an overview of the proposed multi-tier SHOLEN IDS (Spotted Hyena Optimized Long Efficient Networks-speed intrusion detection systems) system suitable for the real-time environment. The first tier of the proposed framework consists of real-time data collection and is classified into two phases. In the first phase, real-time implementation of the wireless nodes for data gathering in an energy-saving hierarchal clustering environment. In the second phase, injections of the different attacks in the network were carried out. At the second tier, different characteristics were retrieved from the pre-processed data utilized to train the suggested model. SHOLE-networks were built at the third tier to anticipate various types of assaults. The present research sets forth the suggested methodology for predicting the malicious node and attack type.

Typical wireless sensor-IoT assisted model consists of sensor nodes, cluster heads, a base station (BS) and aggregation nodes [32]. For the stable operation of the network, the WSN-IoT devices are clustered and cluster heads transmit the collected information to the base station (BS) that reaches the central monitoring station (CMS) through the Internet. The user can remotely monitor the nodes’ activities and control the nodes by issuing different tasks.

In this research, intelligent health care data monitoring and collection system have been considered. Fig. 2 shows the wireless model used in the research.

The proposed IP-enabled wireless sensor nodes are deployed as clusters, cluster heads in the real-time environment, base station, and monitoring systems. The MICOTT (Node MCU and MCP3008) interfaced with four health care sensors used to design the sensor nodes; gateways are used as the base stations, and cloud (firebase) is used as the monitoring station. The complete specification of the real-time setup is shown in Tab. 1.

The above specifications are used to incorporate real-time wireless testbeds and are primarily used for data collection under different scenarios such as normal conditions and attack conditions.

The assumptions of the IP enabled wireless sensor environment are quad folded and are given as follows

• This research uses clustered networks for data transmission, and nodes can communicate directly to the cluster heads. The cluster nodes can transmit the data to the monitoring station through internet services.

• Each Node is static and has a unique IP address, and belongs to one cluster. Each cluster is identified by another unique ID which consists of an IP address

• This research uses the hybrid data transmission model, including the event-based transmission and sustainability models.

This experimental setup is now used for the dataset collection unit. Nearly 15 nodes are used for experimentation in which the five nodes are randomly chosen for inducing the various attacks in the networks. The various types of attack models which are used for emulating the networks are listed in Tab. 2.

Feature extraction plays an important role to differentiate the normal nodes and attack nodes. These features are calculated using real-time testbeds by using various mathematical expressions listed in Tab. 3.

The above features are stored separately in CSV file formats and pre-processed for further prediction/detection of the attacks.

In this section, the new hybrid integration of Spotted Hyena Optimizer (SHO) [37] and LSTM networks [38] has been discussed. Even though LSTM is considered more advantageous than the existing RNN, it suffers from overfitting problems when large datasets also lead to computational complexity [38]. It leads to the LSTM failure in achieving the higher accuracy detection. The paper proposes the computationally efficient hybrid modelling of LSTM with Spotted Hyena Optimizers, which can overcome the problem mentioned above and accurately predict the different categories of attacks in WSN-IoT networks to overcome this drawback.

In the proposed model, training LSTM cells can find the best weights and bias values. Two steps should be carried out to formulate the problem of training the LSTM cells using Spotted Hyena Optimizers (SHO).

where wn are the weights of each LSTM cell and θn is the desired threshold values for obtaining the best threshold weights. The fixing of the objective function is the essential mechanism. The primary objective of training the feedforward deep learning models is to reach the highest classification in terms of prediction/detection accuracy for both training and testing samples. In this proposed model, the fitness function for training the LSTM cells is given by

Oit is the threshold outputs, Eit is the obtained outputs from each LSTM cell, and N is the number of training samples. Usually, the performance of the learning models is measured by Mean Square Error, whose outputs are calculated by the mathematical expression (6). The fitness function is fixed to the lowest MSE so that the highest accuracy of prediction can be obtained for scalable real-time datasets. The new SHOLEN model, which has been formulated, are given as follows:

The complete working of the proposed deep learning model has been presented in the pseudo-code, as shown in Fig. 3.

The real-time experimentations are carried out as discussed in Section. Nearly two months of different traces of data were accumulated and used for further analysis. The details of the data traces which are collected during the experimentation are given in Tab. 4.

32,273 records of data were collected for 2 months, and it has been used to train and test the proposed model. The analysis was developed using Python-Tensorflow 1.3. The version runs on an i7 CPU, 2.4 GHz, 2TB HDD, 16GB RAM, and 2GB NVIDIA Geoforce.

The other universal benchmarks such as CIDDS-001 [35], UNSW-NB15 [32] and NSLKDD [33] are used to evaluate the model under the various scenario to validate the performance of the proposed model. These data sets contain live traffic with different attacks: 80,000 on average and 20,000 DoS records in a total area are covered by the CIDDS-001 features. UNSW-NB15 benchmarks have 49 characteristics with one class label and roughly 1,75,000 cases, comprising standard and attack data. For NSL-KDD, each instance of regular traffic has 37,000 label attributes, while each instance of malicious traffic has 45,332.

Accuracy of prediction is used as the total number of correct decisions whether the incident of an attack happened to evaluate the performance of the proposed model. The metrics such as precision, recall, specificity and f-score were used for the analysis, representing the number of identified attacks in the networks, false identification of attacks by the model and the number of cases identified as usual, respectively.

TP are True positive values, TN-True Negative values, FP-False positive and FN-False-negative values.

This section highlights various performance analyses of the proposed deep learning models juxtaposed with the existing deep learning models specific to the real-time datasets and other benchmarks. In this validation, we have used the different ratios of data splitting that has been used for training and testing to prove the efficiency of the proposed deep learning model.

We have implemented SHOLE-spotted hyena optimized LSTM models for an optimal deep learning model selection and performed 10 iterations using the real-time datasets as shown below. The test datasets were set to a ratio of 80% training and 20% testing. Moreover, the SHO process tuned the model’s hyperparameters to obtain the best accuracy results. The epochs are optimized to 100 with an output batch size of 50 and a learning rate of 0.0001.

Figs. 4–9 shows the detection accuracy (%) for the proposed learning models using the real-time testbeds. In all the cases, the average detection accuracy is 99.89% for predicting the different categories of attacks in the network. Moreover, optimized 50 epochs demonstrated more accuracy, almost equal to 99.89%, with the stability of the learning network. Further, we have also calculated the other performance metrics, which are presented in Tab. 5 below:

Figure 4: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets at 50 epochs

Figure 5: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets in detecting the dos attacks at 50 epochs

Figure 6: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets in detecting the DDoS attacks at 50 epochs

Figure 7: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets in detecting the Sybil attacks at 50 epochs

Figure 8: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets in detecting the wormhole attacks at 50 epochs

Figure 9: Accuracy validation mechanism for the proposed SHOLEN models using the real-time datasets in detecting the RPL and URP attacks at 50 epochs

Tab. 5 depicts the performance of the proposed model in detecting the various attacks. The proposed model exhibits good precision, recall, sensitivity, and f-score to detect the attacks. The optimized learning model has proved its efficiency in detecting attacks using the real-time scenario. In the following scenario, we have trained the proposed model with different benchmarks as mentioned in Section 4.1 and calculated performance metrics under various scenarios.

The performance metrics of the proposed algorithm is calculated with the benchmark datasets and presented in Tabs. 6–8. Tab. 6 presents the performance metrics of the proposed algorithms using UNSW-NB15 Benchmarks; performance metrics such as accuracy, precision, recall, Sensitivity, and F-score has demonstrated a very stable performance, ranging from 99% to 100% in detecting the various categories of attacks. Similarly, Tab. 7 depicts the performance metrics of the proposed algorithm in detecting the attacks using NSL-KDD datasets 99 in which the accuracy ranges from 99.87% to 99.64%, 99.5% to 98.67% precision, 98.50% to 97.50% recall, 99% to 98.67% sensitivity and 98.23% to 97.02% F-score. Finally, Tab. 8 shows the performance of the proposed model using the CIDCC datasets 2017, exhibiting a very high performance in detecting the various attacks. The experimental result shows that the integration of the spotted Hyena optimizer in LSTM has exhibited a high performance in which it has reduced the high false alarm rates.

In this section, we have compared the existing deep learning algorithms such as RNN [31], ASCH-IDS [30], Improved GA based DNN [38] and DBN [22] algorithms for the detection of various attacks using the collection of the real-time dataset.

The performance metrics of different hybrid deep learning models have been compared for real-time datasets, as shown in Fig. 10. It is evident from Fig. 10 that the proposed algorithm has outperformed the other learning models with an accuracy of 99.89%. The AHCS-IDS has reasonable accuracy of 95%, whereas other algorithms have even lesser performance than AHCS-IDS. The integration of the SHO in LSTM has shown stable performance in the real-time test data, which makes it suitable for the real-time scenario. The other benchmark datasets are taken to compare deep learning models’ performance in Figs. 11–13. Experimental results showed the accuracy of all hybrid models ranges from 99.989% to 99.65%; precision ranges from 95.0% to 98%, recall ranges from 96% to 97%, and F-score ranges from 97%–98%. Hence, the performance of the proposed model has a decisive edge over other deep learning models. It was found that the proposed SHOLEN model has shown stable performances with the real-time data and also with the other benchmarks. However, the performance of other hybrid deep learning models has shown darker performance in real-time datasets and brighter under benchmarks. Our proposed SHOLEN model has demonstrated its suitability for a real-time dataset applied in smart health care monitoring systems considering the above results.

Figure 10: Comparative analysis between the different deep learning modes using the real-time datasets

Figure 11: Comparative analysis between the different deep learning modes using the NSL-KDD++ datasets

Figure 12: Comparative analysis between the different deep learning modes using the UNSW-NB15 benchmark dataset

Figure 13: Comparative analysis between the different deep learning modes using the CIDCC-dataset 2017

The Spotted Hyena Optimizer integrated LSTM networks have been proposed in the paper. The proposed algorithm is applied to the clustered WSN-IoT environments, architecting the multi-tier WSN-IoT intrusion detection system model. The real-time datasets were collected using the embedded CPU interfaced with esp8266 transceivers. Nearly 60,000 data were collected and used for training and testing. Further, the proposed algorithm has been compared with the other hybrid deep learning models under two scenarios: real-time environments and benchmark datasets. The results show that the proposed algorithm has shown consistent performance, such as accuracy of 99.89%, precision of 98%, 97.5% recall, and 99% f-score in predicting the various categories of attacks in the WSN-IoT environment using scalable datasets. The other hybrid deep learning models have exhibited exemplary performance using benchmarks but showed a marked dip in performance while using the real-time datasets. The experimentation shows that the proposed deep learning model has shown better performance for different datasets and can gain immense traction in innovative health care monitoring applications. Further, the proposed models need to focus on identifying the increased attacks without compromising the reduction of energy consumption.

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

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Intelligent Automation & Soft Computing DOI:10.32604/iasc.2022.022259
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