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Enhanced Coyote Optimization with Deep Learning Based Cloud-Intrusion Detection System

Abdullah M. Basahel1, Mohammad Yamin1, Sulafah M. Basahel2, E. Laxmi Lydia3,*

1 Faculty of Economics and Administration, King Abdulaziz University, Jeddah, Saudi Arabia
2 E-commerce Department, College of Administrative and Financial Sciences, Saudi Electronic University, Jeddah, Saudi Arabia
3 Department of Computer Science and Engineering, Vignan’s Institute of Information Technology, Visakhapatnam, 530049, India

* Corresponding Author: E. Laxmi Lydia. Email: email

Computers, Materials & Continua 2023, 74(2), 4319-4336. https://doi.org/10.32604/cmc.2023.033497

Abstract

Cloud Computing (CC) is the preference of all information technology (IT) organizations as it offers pay-per-use based and flexible services to its users. But the privacy and security become the main hindrances in its achievement due to distributed and open architecture that is prone to intruders. Intrusion Detection System (IDS) refers to one of the commonly utilized system for detecting attacks on cloud. IDS proves to be an effective and promising technique, that identifies malicious activities and known threats by observing traffic data in computers, and warnings are given when such threats were identified. The current mainstream IDS are assisted with machine learning (ML) but have issues of low detection rates and demanded wide feature engineering. This article devises an Enhanced Coyote Optimization with Deep Learning based Intrusion Detection System for Cloud Security (ECODL-IDSCS) model. The ECODL-IDSCS model initially addresses the class imbalance data problem by the use of Adaptive Synthetic (ADASYN) technique. For detecting and classification of intrusions, long short term memory (LSTM) model is exploited. In addition, ECO algorithm is derived to optimally fine tune the hyperparameters related to the LSTM model to enhance its detection efficiency in the cloud environment. Once the presented ECODL-IDSCS model is tested on benchmark dataset, the experimental results show the promising performance of the ECODL-IDSCS model over the existing IDS models.

Keywords


1  Introduction

Cloud Computing (CC) presents on-demand network accessibility to a group of configurable computing assets such as servers, networks, services, storage, and applications, that can be quickly revealed with service provider interaction or lesser management attempts [1]. Whereas it renders several advantages, one such major difficulty for associations seeking to implement cloud-based solutions was safety. The reason behind this was due to the cloud infrastructure nature that is completely dispersed and open [2], therefore becoming more prone to attacks and threats. This atmosphere forms inducements for effective invaders for initiating assaults which target the gadgets with accessibility to data saved on a cloud [3]. The menaces because of assaults were to the availability, integrity, and confidentiality of sources and cloud services. For instance, a Distributed Denial of Service (DDoS) attack, was the one which focuses on preventing accessibility of data saved on a cloud, by choking bandwidth of the network via packet flooding [4]. Other effective assault kinds involve Port Scanning, Internet Protocol (IP) spoofing, Man in the Middle Attack, Domain Naming System (DNS) poisoning, and so on. Cloud security was an exciting active domain of research works and several heuristics emerged and were suggested. Fundamental security components like a firewall which gives protection to the internal network and adopts message encoding is used as primary lines of defence [5]. But a firewall cannot find an assault commenced by an insider.

Nowadays, the diverse intrusion detection system (IDS) methods and tools were accessible in the cloud platform for finding assaults on cloud infrastructure [6]. The conventional or prevailing IDS becoming unsuccessful and ineffective because of dynamic behavior and heavy traffic. IDS typically accompaniment a firewall for forming an effectual security solution. Such factors lead to a surge in developing a creative way of improving the IDS in CC [7]. That could observe network traffic and efficiently detects network intrusions. This study was aimed at network-related security assaults on the public cloud atmosphere and suggested solutions and proposals. Interpretation from the publication which does not cover the number of countless protections towards network assaults [8]. Irrespective of the substantial number of endeavours performed by security experts in time of recent 2 decades, the system security problem not searched. The reason for this was the speedy development in computation power and available sources to invaders that allows them in launching complicated assaults [9]. An IDS becomes the most commonly utilized method to detect assaults on cloud environments. The growth of effective IDS becomes unsuccessful for placement in cloud atmosphere because of its distributed and virtualized nature [10].

This article devises an Enhanced Coyote Optimization with Deep Learning based Intrusion Detection System for Cloud Security (ECODL-IDSCS) model. The ECODL-IDSCS model initially addresses the class imbalance data problem by the use of Adaptive Synthetic (ADASYN) technique. For detecting and classification of intrusions, long short term memory (LSTM) model is exploited. In addition, ECO algorithm is derived to optimally fine tune the hyperparameters related to the LSTM model to enhance its detection efficiency in the cloud environment. Once the presented ECODL-IDSCS model is tested on benchmark dataset, the experimental results show the promising performance of the ECODL-IDSCS model over the existing IDS models.

2  Related Works

In [11], cloud IDS at hypervisor layer can be advanced and evaluated for detecting the depraved activities in CC atmosphere. The cloud IDS employs a hybrid method that is a blend of improved fuzzy c-means (FCM) clustering method and Back propagation artificial Neural Network (ANN) for improving the accuracy of detection of cloud IDS. The suggested technique can be applied and compared with classic FCM and K-means. In [12], a host-oriented IDS (H-IDS) for protection of virtual machines in the cloud atmosphere was suggested. To end this, initially, significant features of every class were chosen by making use of logistic regression (LR) and such values were enhanced utilizing the regularization method. Afterward, several attacks were categorized by leveraging a mixture of 3 distinct classifiers they are neural network (NN), decision tree (DT), and linear discriminate analysis (LDA) with bagging technique for every class.

Chiba et al. [13] suggest to optimize a very famous soft computing tool broadly utilized for IDS such as Back Propagation Neural Network (BPNN) employing an Improved Genetic Algorithm (IGA). Genetic algorithm (GA) can be enhanced via optimizing policies, like Fitness Value Hashing and Parallel Processing that minimize convergence period, performance period, and save processing power. As, learning rate and Momentum terminologies were amongst the most related parameters which influence the BPNN classifier performance, and used IGA for finding near optimal or optimal values of such 2 parameters that assure low false alarm rate, high detection rate, and high accuracy. Mayuranathan et al. [14] present an effectual feature subset selection on the basis of classifier method for identifying DDoS attacks. For detection of the DDoS attacks in IDS, optimal feature set can be chosen having maximal detection by using Random Harmony Search (RHS) optimization method. Once the features were chosen, a DL-related classification method employing Restricted Boltzmann Machines (RBM) can be implied for detecting the DDoS. To improve the detection rates of DDoS attacks, 7 extra layers set were involved amongst the visible and hidden layers of the RBM. Jaber et al. [15] suggest a new IDS which compiles an FCM method having support vector machine (SVM) for enhancing the accurateness of the detection system in CC atmosphere. The presented model can be applied and comparison made with prevailing systems.

3  The Proposed ECODL-IDSCS Model

In this study, a new ECODL-IDSCS model has been developed to accomplish security in the cloud environment. The presented ECODL-IDSCS model encompasses a series of processes such as data normalization and class imbalance data handling at the primary step. In addition, the LSTM model is utilized for the recognition and classification of intrusions. Finally, the ECO algorithm is derived to optimally fine tune the hyperparameters related to the LSTM model. Fig. 1 depicts the overall process of ECODL-IDSCS algorithms.

images

Figure 1: Overall process of ECODL-IDSCS approach

3.1 Data Pre-processing

The presented ECODL-IDSCS model performs data normalization at the primary step. A larger gap between different dimensional feature datasets within the data brings about problems like insignificant accuracy improvement and slow model training; thus, tackling these issues, the MinMaxScaler was adapted for mapping the dataset into the interval of (0,1) in the following:

x=xxminxmaxxmin(1)

In Eq. (1), xmax represents the maximal value, and xmin denotes the minimal value.

3.2 ADASYN Model

In this study, the class imbalance data problem can be addressed by the use of ADASYN technique. ADASYN is an adaptive oversampling technique based on the minority class sample [16]. In comparison to data expansion algorithm, it is represented as the fact that it produces lesser instances in feature space with high density and more instance in a special space with low density. This feature has the benefit of adaptively shifting decision boundary to difficult-to-learn instance, so the ADASYN is better suited when compared to augmentation techniques for handling network traffic with serious information imbalance. The process is implemented in the subsequent steps:

Step 1: Evaluate the number of instance to be synthesized as G that is formulated by

G=(nbns)×β(2)

In Eq. (2), nb signifies the majority instance, ns characterizes the minority instance, and β(0,1).

Step 2: For every minority instance, evaluate K neighbors through the Euclidean distance and represented as ri the proportion of majority class instance comprised in the neighbor that is formulated by

ri=k/K(3)

In Eq. (3), K indicates the existing number of neighbors, as well as k denotes the majority class samples in the existing neighbors.

Step 3: Evaluate the sample count that should be combined for every minority instance based on G and combine the instances based on the following expression as follows

g=G×ri(4)

Zi=Xi+(XziXi)×λ(5)

In Eq. (5), g indicates the quantity to be synthesized, Zi denotes the synthesized new instance, Xi denotes the existing minority instance, and XZi denotes an arbitrary minority sample amongst the k neighbors of Xi,λ(0,1).

3.3 LSTM Based Intrusion Detection and Classification

At this stage, the LSTM model is utilized for the recognition and classification of intrusions. The LSTM method was capable of storing the previous data so captured the prominent long-range dependency from the provided input [17]. The LSTM is executed significantly from the sequence modelling task like text classifier, sentiment analysis (SA), time series forecast, and so on. There are 3 essential components from the LSTM technique containing input, forget, and output gates. The forget gate is resolved for forget or discard irrelevant data in the preceding cell state and novel input data. The sigmoid function was utilized from the trained for returning the values amongst zero and one. The value closer to 0 represents that the data is lesser significant for remembering. An input gate acts as filters for deciding that data was worth remember, so that upgrade as to next state. A value closer to 0 signifies that it can be lesser significant that upgraded. The resultant gate defines the data which must be the outcome from the next cell state.

The computations of single LSTM unit at a single time step t from the forget gate fz, input gate iz, output gate oz, and cell state cz are determined as:

fz=σ(WfXz+Ufhz1+bf)(6)

iz=σ(WiXz+Uihz1+bi)(7)

oz=σ(WoXz+Uohz1+bo)(8)

c~z=tanh(WcXz+Uchz1+bc)(9)

cz=fzcz1+izc~z(10)

hz=oztanh(cz)(11)

whereas σ stands for the sigmoid function, Xz represents the input, (Wf,Wi,Wo,Wc,Uf,Ui,Uo,Uc) and (bi,bf,bcbo,) demonstrates the weighted matrix and bias from the input gate, forget gate, cell state, and output gate correspondingly. hz1 and cz1 were the resultant of LSTM at time step z1. The function refers the element wise multiplication.

3.4 ECO Based Parameter Optimization

Lastly, the ECO algorithm is derived to optimally fine tune the hyperparameters [1820] related to the LSTM model to enhance its detection efficiency in the cloud environment. The COA has population based metaheuristic to resolve global optimized problems [21]. This optimized technique was simulated by the social performance of Canis Latrans species which reside mostly in North America. The population of coyotes can be separated as Gp groups with Cc coyotes from all the groups. Thus, the population size is determined as the multiplication of GpCc. All the coyotes are assumed that feasible (candidate) solution and their social conditions signified the objective function or decision variable. Accordingly, the social condition of cth coyote from the pth group at iteration t is demonstrated mathematically as follows:

SCcp,t=X=(x,x,,xD)(12)

whereas D implies the searching space dimensional.

This social behavior contains adapting coyotes to environment named ftcp,tR. The alteration of coyotes to their respective present social condition was validated utilizing the subsequent formula:

ftcp,t=f(SCcp,t)(13)

Begin with procedure, the coyotes were arbitrarily allocated to groups. But, the coyotes are sometimes a tendency for abandon its groups for combining other groups or developed solitary. The probability Pa that a coyote leaves their group is provided below:

Pa=0,005Cc2(14)

While the value of Pa could not exceed unity, the amount of coyotes per group was restricted to 14. This process enhances the cultural interchange among every coyote from the global population. During all the groups, the leader of coyotes, also named as alpha coyote was the coyote which attains an optimum objective function. Assuming that minimized problems, the alpha coyote is defined mathematically by the subsequent formula:

alphap,t={SCcp,t|argc={1,2,,Cc}minf(SCcp,t)}(15)

The cultural tendency of all the groups is demonstrated as:

cultrjp,t={RCc+12,jp,t,Cc is oddRCc2jp,t+R(Cc2+1)jp,t,2Otherwise(16)

In which Rp,t signifies the ranked social condition of coyote inside pth group at iteration t to all the j from the searching space D. Afterward, determine the global optimum alphap,t and the cultural tendency cultrp,t of all the groups, novel social conditions of coyotes were upgraded utilizing the subsequent formula:

newSCcp,t={SCcp,t+r1(alphap,tSCcr1p,t)+r2(cultrp,tSCcr2p,t}(17)

whereas SCcr1p,t and SCcr2p,t were social conditions of random coyotes cr1 and cr2 correspondingly. r1 and r2 imply the arbitrary numbers from the range of zero and one. Fig. 2 illustrates the flowchart of COA.

images

Figure 2: Flowchart of COA

The fitness value of novel social conditions is computed as:

ftcp,t={newftcp,t,ifnew_ftcp,t<ftcp,tftcp,t,Otherwise (18)

The selective of final social conditions are dependent upon the computation of novel solutions. Everyone has related to the worse solution from all the groups and optimum one is then kept as can be demonstrated in the subsequent formula:

SCcp,t={new,SCcp,tifnewftcp,t<ftcp,tSCcp,tOtherwise(19)

In COA, the 2 important biological events of life (that is, the death and birth) were modeled assuming that the age of all coyotes agecp,t N from the group p. A novel coyote is born by relating 2 parents SCr1,jp,t and SCr2jp,t selective arbitrarily. The procedure of birth is mathematically provided as:

ppjp,t={SCr1,jp,trj<Psorj=j1SCr2,jp,t,rjPs+PzKjOtherwise(20)

whereas r1 and r2 denotes the parents coyotes chosen arbitrarily in the groups p. j1 and j2 are 2 arbitrary dimensional problems. rj and Kj implies the arbitrary numbers from the range of zero and one. Ps and Pz signifies the scatter and connection probability correspondingly. It can be computed as:

Ps=1D(21)

Pz=1Ps2(22)

Important steps of COA are provided under:

Step1: Create arbitrarily GpCc solutions and estimate the adaptive function.

Step2: Implement the subsequent functions inside all the groups.

• Identify the alphas of groups.

• Calculate the cultural tendency of groups.

• Upgrade the social condition of coyotes from the group.

• Estimate the novel social condition.

• Do the alteration.

• Progress the birth and death life cycle.

Step3: Change of coyotes amongst arbitrary groups.

Step4: Repeating step 2 still the end condition was attained.

Step5: Output the optimum social conditions of the modified coyote.

The ECO algorithm is developed by the use of late acceptance hill-climbing (HC) concept with the traditional COA. The HC signifies the most local search procedures [22]. Primarily, it starts with arbitrary solutions and iteratively transfers downhill in a present solution still the neighborhood solutions with optimum quality are reached. It can be utilized from several tries of optimized tasks. The HC begins with a randomized solution to candidate problems Hi={Hi1,Hi2,,Hin}, afterward, it executes 2 operators, β operator, and Neighborhood navigation (N-operator), for iteratively taking novel solution Hi={Hi1,Hi2,,Hin}. During all the iterations of HC, the N-operator stage was executed by the random walk approach for obtaining the neighboring solution (Hi) of solutions Hi as follows:

Hik=Hik±U(0,1)×BW!k[1,n](23)

At this point, BW=UBkLBk. Conversely, β operator was created for assigning a novel values to the novel solution Hi utilizing original values of Hi or novel ones as follows:

Hik={HirifrandβHikotherwise(24)

The β-operator is improve the exploration of HC by roaming from a searching zone to another one. In addition, exploitation was executed by N-operator phase which supports the neighborhood search for present solutions. By these operators, the HC is avoid trapping by the local minimum.

4  Results and Discussion

The experimental validation of the ECODL-IDSCS model is tested using the NSL-KDD dataset [23]. The ECODL-IDSCS model is examined under two aspects such as binary classification and multi-classification. Tabs. 1 and 2 depict the detailed description of two datasets.

images

images

Fig. 3 implies the confusion matrices formed by the ECODL-IDSCS model on binary classification dataset. On entire dataset, the ECODL-IDSCS model has identified 489 samples into normal and 1989 samples into abnormal. Also, on 70% of training (TR) data, the ECODL-IDSCS methodology has identified 345 samples into normal and 1388 samples into abnormal. Besides, on 30% of testing (TS) data, the ECODL-IDSCS technique has identified 144 samples into normal and 601 samples into abnormal.

imagesimages

Figure 3: Confusion matrices of ECODL-IDSCS approach on binary classification (a) Entire dataset, (b) 70% of TR data, and (c) 30% of TS data

Tab. 3 and Fig. 4 exhibits the classifier output of the ECODL-IDSCS model on the binary classification dataset. The obtained values represented that the ECODL-IDSCS model has accomplished effectual outcomes. For instance, on entire dataset, the ECODL-IDSCS model has resulted in average accuy of 99.12%, precn of 98.63%, recal of 98.63%, F1score of 98.63%, and AUCscore of 98.63%. Concurrently, on 70% of TR data, the ECODL-IDSCS approach has resulted in average accuy of 99.03%, precn of 98.54%, recal of 98.44%, F1score of 98.49%, and AUCscore of 98.44%. Eventually, on 30% of TS data, the ECODL-IDSCS method has resulted in average accuy of 99.33%, precn of 98.81%, recal of 99.07%, F1score of 98.94%, and AUCscore of 99.07%.

images

images

Figure 4: Result analysis of ECODL-IDSCS approach under binary classification dataset

A clear precision-recall analysis of the ECODL-IDSCS algorithm on binary classification dataset is represented in Fig. 5. The figure denoted the ECODL-IDSCS technique has resulted in enhanced values of precision-recall values under all classes.

images

Figure 5: Precision-recall analysis of ECODL-IDSCS approach under binary classification dataset

A brief receiver operating characteristic (ROC) examination of the ECODL-IDSCS technique on binary classification dataset is shown in Fig. 6. The results represented the ECODL-IDSCS methodology has shown its ability in categorizing distinct classes on the binary classification dataset.

images

Figure 6: ROC analysis of ECODL-IDSCS approach under binary classification dataset

Fig. 7 signifies the confusion matrices formed by the ECODL-IDSCS method on Multiclass classification dataset. On entire dataset, the ECODL-IDSCS technique has identified 492 samples into normal, 494 samples into DoS, 474 samples into Probe, 484 samples into R2L, and 490 samples into U2R. Also, on 70% of TR data, the ECODL-IDSCS approach has identified 335 samples into normal, 337 samples into DoS, 334 samples into Probe, 358 samples into R2L, and 338 samples into U2R. Besides, on 30% of TS data, the ECODL-IDSCS methodology has identified 157 samples into normal, 157 samples into DoS, 140 samples into Probe, 126 samples into R2L, and 152 samples into U2R.

images

Figure 7: Confusion matrices of ECODL-IDSCS approach on Multiclass classification (a) Entire dataset, (b) 70% of TR data, and (c) 30% of TS data

Tab. 4 and Fig. 8 show the classifier output of the ECODL-IDSCS method on the Multiclass classification dataset. The acquired values indicated that the ECODL-IDSCS approach has accomplished effectual outcomes. For example, on entire dataset, the ECODL-IDSCS method has resulted in average accuy of 98.94%, precn of 97.38%, recal of 97.36%, F1score of 97.36%, and AUCscore of 98.35%. Simultaneously, on 70% of TR data, the ECODL-IDSCS algorithm has resulted in average accuy of 98.90%, precn of 97.26%, recal of 97.28%, F1score of 97.26%, and AUCscore of 98.30%. Meanwhile, on 30% of TS data, the ECODL-IDSCS technique has resulted in average accuy of 99.04%, precn of 97.65%, recal of 97.51%, F1score of 97.57%, and AUCscore of 98.45%.

images

images

Figure 8: Result analysis of ECODL-IDSCS approach under Multiclass classification dataset

A clear precision-recall inspection of the ECODL-IDSCS methodology on Multiclass classification dataset is depicted in Fig. 9. The figure signifies that the ECODL-IDSCS technique has resulted in enhanced values of precision-recall values under all classes.

images

Figure 9: Precision-recall analysis of ECODL-IDSCS approach under Multiclass classification dataset

A brief ROC analysis of the ECODL-IDSCS technique on Multiclass classification dataset is portrayed in Fig. 10. The results show the ECODL-IDSCS algorithm has shown its ability in categorizing distinct classes on the Multiclass classification dataset.

images

Figure 10: ROC analysis of ECODL-IDSCS approach under Multiclass classification dataset

To assure the enhanced performance of the ECODL-IDSCS model, a wide range of experiments were carried out in Tab. 5 [24]. The results implied that the adaptive ensemble, two-stage classifier ensemble based IDS (TES-IDS), GAR-Forest, and CNN-BiLSTM models have resulted to lower accuy values of 84.76%, 85.43%, 85.41%, and 83.89% respectively. Next to that, the Double-Layered Hybrid Approach (DLHA) technique has shown slightly improved accuy of 87.08%. Followed by, the deep learning model for network intrusion detection (DLNID) technique has accomplished reasonable accuy of 90.51%. However, the ECODL-IDSCS model has demonstrated higher accuy of 99.04%. Thus, the ECODL-IDSCS model can be applied to recognize intrusions in the CC environment.

images

5  Conclusion

In this work, a novel ECODL-IDSCS model was projected to accomplish security in the cloud environment. The presented ECODL-IDSCS model encompasses a series of processes such as data normalization and class imbalance data handling at the primary step. Additionally, the LSTM method was utilized for the recognition and classification of intrusions. Finally, the ECO algorithm is derived to optimally fine tune the hyperparameters related to the LSTM model to enhance its detection efficiency in the cloud environment. Once the presented ECODL-IDSCS model can be tested on benchmark dataset, the experimental results show the promising performance of the ECODL-IDSCS model over the existing IDS models. Thus, the ECODL-IDSCS model can be utilized as an effectual tool to achieve maximum security in the cloud platform. In future, the performance of the ECODL-IDSCS model can be improvised by the use of advanced DL classifiers.

Funding Statement: The Deanship of Scientific Research (DSR) at King Abdulaziz University (KAU), Jeddah, Saudi Arabia has funded this project, under grant no. KEP-1-120-42.

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

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Cite This Article

A. M. Basahel, M. Yamin, S. M. Basahel and E. L. Lydia, "Enhanced coyote optimization with deep learning based cloud-intrusion detection system," Computers, Materials & Continua, vol. 74, no.2, pp. 4319–4336, 2023.


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