Department of Computer Science and Information Systems

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Author: search.filters.author.Narang, PratikSubject: search.filters.subject.Machine Learning

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Now showing 1 - 9 of 9
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    Feature Selection for Detection of Peer-to-Peer Botnet Traffic
    (ACM Digital Library, 2013) Narang, Pratik
    The use of anomaly-based classification of intrusions has increased significantly for Intrusion Detection Systems. Large number of training data samples and a good ‘feature set’ are two primary requirements to build effective classification models with machine learning algorithms. Since the amount of data available for malicious traffic will often be small compared to the available traces of benign traffic, extraction of ‘good’ features which enable detection of malicious traffic is a challenging area of work. This research work presents preliminary results of comparison of performance of three different feature selection algorithms - Correlation based feature selection, Consistency based subset evaluation and Principal component analysison three different Machine learning techniques- namely Decision trees, Na¨ıve Bayes classifier, and Bayesian Network classifier. These algorithms are evaluated for the detection of Peer-to-Peer (P2P) based botnet traffic.
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    PeerShark: Detecting Peer-to-Peer Botnets by Tracking Conversations
    (IEEE, 2014) Narang, Pratik
    The decentralized nature of Peer-to-Peer (P2P) botnets makes them difficult to detect. Their distributed nature also exhibits resilience against take-down attempts. Moreover, smarter bots are stealthy in their communication patterns, and elude the standard discovery techniques which look for anomalous network or communication behavior. In this paper, we propose Peer Shark, a novel methodology to detect P2P botnet traffic and differentiate it from benign P2P traffic in a network. Instead of the traditional 5-tuple 'flow-based' detection approach, we use a 2-tuple 'conversation-based' approach which is port-oblivious, protocol-oblivious and does not require Deep Packet Inspection. Peer Shark could also classify different P2P applications with an accuracy of more than 95%.
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    Temperature compensation of ISFET based pH sensor using artificial neural networks
    (IEEE, 2017) Narang, Pratik; Ajmera, Pawan K.
    This paper presents a new Machine Learning based temperature compensation technique for Ion-Sensitive Field-Effect Transistor (ISFET). The circuit models for various electronic devices like MOSFET are available in commercial Technology Computer Aided Design (TCAD) tools such as LT-SPICE but no built-in model exists for ISFET. Considering SiO 2 as the sensing film, an ISFET circuit model was created in LT-SPICE and simulations were carried out to obtain characteristic curves for SiO 2 based ISFET. A Machine Learning (ML) model was trained using the data collected from the simulations performed using the ISFET macromodel in the read-out circuitry. The simulations were performed at various temperatures and the temperature drift behavior of ISFET was fed into the ML model. Constant pH (predicted by the system) curves were obtained when the device is tested for various pH (7 and 10) solutions at different ambient temperatures.
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    Multiclass Fake News Detection using Ensemble Machine Learning
    (IEEE, 2019) Narang, Pratik
    Over the past few years, fake news and its influence have become a growing cause of concern in terms of debate and public discussions. Due to the availability of the Internet, a lot of user-generated content is produced across the globe in a single day using various social media platforms. Nowadays, it has become very easy to create fake news and propagate it worldwide within a short period of time. Despite receiving significant attention in the research community, fake news detection did not improve significantly due to insufficient context-specific news data. Most of the researchers have analyzed the fake news problem as a binary classification problem, but many more prediction classes exist. In this research work, experiments have been conducted using a tree-based Ensemble Machine Learning framework (Gradient Boosting) with optimized parameters combining content and context level features for fake news detection. Recently, adaptive boosting methods for classification problems have been derived as gradient descent algorithms. This formulation justifies key elements and parameters in the methods, which are chosen to optimize a single common objective function. Experiments are conducted using a multi-class dataset (FNC) and various machine learning models are used for classification. Experimental results demonstrate the effectiveness of the ensemble framework compared to existing benchmark results. Using the Gradient Boosting algorithm (an ensemble machine learning framework), we achieved an accuracy of 86% for multi-class classification of fake news having four classes.
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    A Hybrid Model for Effective Fake News Detection with a Novel COVID-19 Dataset
    (CITEPRESS, 2021) Narang, Pratik
    Due to the increasing number of users in social media, news articles can be quickly published or share among users without knowing its credibility and authenticity. Fast spreading of fake news articles using different social media platforms can create inestimable harm to society. These actions could seriously jeopardize the reliability of news media platforms. So it is imperative to prevent such fraudulent activities to foster the credibility of such social media platforms. An efficient automated tool is a primary necessity to detect such misleading articles. Considering the issues mentioned earlier, in this paper, we propose a hybrid model using multiple branches of the convolutional neural network (CNN) with Long Short Term Memory (LSTM) layers with different kernel sizes and filters. To make our model deep, which consists of three dense layers to extract more powerful features automatically. In this research, we have created a dataset (FN-COV) collecting 69976 fake and real news articles during the pandemic of COVID-19 with tags like social-distancing, covid19, and quarantine. We have validated the performance of our proposed model with one more real-time fake news dataset: PHEME. The capability of combined kernels and layers of our C-LSTM network is lucrative towards both the datasets. With our proposed model, we achieved an accuracy of 91.88% with PHEME, which is higher as compared to existing models and 98.62% with FN-COV dataset.
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    PeerShark: flow-clustering and conversation-generation for malicious peer-to-peer traffic identification
    (Springer, 2014-10) Narang, Pratik
    The distributed and decentralized nature of peer-to-peer (P2P) networks has offered a lucrative alternative to bot-masters to build botnets. P2P botnets are not prone to any single point of failure and have been proven to be highly resilient against takedown attempts. Moreover, smarter bots are stealthy in their communication patterns and elude the standard discovery techniques which look for anomalous network or communication behavior. In this paper, we present a methodology to detect P2P botnet traffic and differentiate it from benign P2P traffic in a network. Our approach neither assumes the availability of any ‘seed’ information of bots nor relies on deep packet inspection. It aims to detect the stealthy behavior of P2P botnets. That is, we aim to detect P2P botnets when they lie dormant (to evade detection by intrusion detection systems) or while they perform malicious activities (spamming, password stealing, etc.) in a manner which is not observable to a network administrator. Our approach PeerShark combines the benefits of flow-based and conversation-based approaches with a two-tier architecture, and addresses the limitations of these approaches. By extracting statistical features from the network traces of P2P applications and botnets, we build supervised machine learning models which can accurately differentiate between benign P2P applications and P2P botnets. PeerShark could also detect unknown P2P botnet traffic with high accuracy.
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    Noise-resistant mechanisms for the detection of stealthy peer-to-peer botnets
    (Elsevier, 2016-12) Narang, Pratik
    The problem of detection of malicious network traffic is adversarial in nature. Accurate detection of stealthy Peer-to-Peer botnets is an ongoing research problem. Past research on detection of P2P botnets has frequently used machine learning algorithms to build detection models. However, most prior work lacks the evaluation of such detection models in the presence of deliberate injection of noise by an adversary. Furthermore, detection of P2P botnets in the presence of benign P2P traffic has received little attention from the research community. This work proposes a novel approach for the detection of stealthy P2P botnets (in presence of benign P2P traffic) using conversation-based mechanisms and new features based on Fourier transforms and information entropy. We use real-world botnet data to compare the performance of our features with traditional ‘flow-based’ features employed by past research, and demonstrate that our approach is more resilient towards the injection of noise in the communication patterns by an adversary. We build detection models with multiple supervised machine learning algorithms. With our approach, we could detect P2P botnet traffic in the presence of injected noise with True Positive rate as high as 90%.
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    FNDNet – A deep convolutional neural network for fake news detection
    (Elsevier, 2020-06) Narang, Pratik
    With the increasing popularity of social media and web-based forums, the distribution of fake news has become a major threat to various sectors and agencies. This has abated trust in the media, leaving readers in a state of perplexity. There exists an enormous assemblage of research on the theme of Artificial Intelligence (AI) strategies for fake news detection. In the past, much of the focus has been given on classifying online reviews and freely accessible online social networking-based posts. In this work, we propose a deep convolutional neural network (FNDNet) for fake news detection. Instead of relying on hand-crafted features, our model (FNDNet) is designed to automatically learn the discriminatory features for fake news classification through multiple hidden layers built in the deep neural network. We create a deep Convolutional Neural Network (CNN) to extract several features at each layer. We compare the performance of the proposed approach with several baseline models. Benchmarked datasets were used to train and test the model, and the proposed model achieved state-of-the-art results with an accuracy of 98.36% on the test data. Various performance evaluation parameters such as Wilcoxon, false positive, true negative, precision, recall, F1, and accuracy, etc. were used to validate the results. These results demonstrate significant improvements in the area of fake news detection as compared to existing state-of-the-art results and affirm the potential of our approach for classifying fake news on social media. This research will assist researchers in broadening the understanding of the applicability of CNN-based deep models for fake news detection.
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    A hybrid approach for search and rescue using 3DCNN and PSO
    (ACM Digital Library, 2021-09) Narang, Pratik
    Search and rescue are essential applications of disaster management in which people are evacuated from the disaster-prone area to a safer place. This overall process of search and rescue can be more efficient if an automated system can quickly locate the human or area where rescue is required. To provide a faster and accurate search of those places, this paper proposes a novel approach to search and rescue using automated drone surveillance. In this paper, a complex scene classification problem is solved using the proposed 3DCNN model. The proposed model uses spatial as well as temporal features of the video for the classification of the scene as help or non-help in the natural disaster. Due to the unavailability of such kind of dataset, it is impossible to train the model. Therefore, it is essential to develop a dataset for search and rescue. The proposed dataset is a first and unique dataset for scene classification using drone surveillance. The major contribution of this paper is (1) a novel 3DCNN powered model for scene classification in drone surveillance, (2) to develop the required dataset for the training of scene classification model, and (3) particular swarm optimization (PSO)-based hyper-parameter tuning for getting the best value of multiple parameters used for training the model. Our hybridization of parameter tuning with PSO helps for the convergence of parameter values of proposed 3DCNN model, and the proposed scene classification model (3DCNN+PSO) is applied to the dataset. The proposed model gives an impressive performance to help situation identification with 98% training and 99% validation accuracy.