arXiv subjects

Anshuman Chhabra

Publications and source records attributed to Anshuman Chhabra.

38 records · Page 3Linked to original sources

arXiv2019

An Energy Efficient Routing Protocol for Wireless Internet-of-Things Sensor Networks

Internet of Things (IoT) are increasingly being adopted into practical applications such as security systems, smart infrastructure, traffic management, weather systems, among others. While the scale of these applications is enormous, device capabilities, particularly in terms of battery life and energy efficiency are limited. Despite research being done to ameliorate these shortcomings, wireless IoT networks still cannot guarantee satisfactory network lifetimes and prolonged sensing coverage. Moreover, proposed schemes in literature are convoluted and cannot be easily implemented in real-world scenarios. This necessitates the development of a simple yet energy efficient routing scheme for wireless IoT sensor networks. This paper models the energy constraint problem of devices in IoT applications as an optimization problem. To conserve the energy of device nodes, the routing protocol first aggregates devices into clusters based on a number of different features such as distance from base station, data/message length and data sensed from the environment in the current epoch. Then, a cluster head is elected for each cluster and a directed acyclic graph (DAG) is generated with all the cluster heads as nodes. Edges represent communication intent from transmitter to receiver and the edge weights are computed using a formulated equation. The minimum cost path to the base station is computed to allow for efficient real-time routing. Sleep scheduling is also optionally used to further boost network energy efficiency. The proposed routing protocol has been simulated and outperforms existing routing protocols in terms of metrics such as number of active nodes, energy dynamics and network coverage.

cs.NI↗

arXiv2018

An approach to predictively securing critical cloud infrastructures through probabilistic modeling

Cloud infrastructures are being increasingly utilized in critical infrastructures such as banking/finance, transportation and utility management. Sophistication and resources used in recent security breaches including those on critical infrastructures show that attackers are no longer limited by monetary/computational constraints. In fact, they may be aided by entities with large financial and human resources. Hence there is urgent need to develop predictive approaches for cyber defense to strengthen cloud infrastructures specifically utilized by critical infrastructures. Extensive research has been done in the past on applying techniques such as Game Theory, Machine Learning and Bayesian Networks among others for the predictive defense of critical infrastructures. However a major drawback of these approaches is that they do not incorporate probabilistic human behavior which limits their predictive ability. In this paper, a stochastic approach is proposed to predict less secure states in critical cloud systems which might lead to potential security breaches. These less-secure states are deemed as `risky' states in our approach. Markov Decision Process (MDP) is used to accurately incorporate user behavior(s) as well as operational behavior of the cloud infrastructure through a set of features. The developed reward/cost mechanism is then used to select appropriate `actions' to identify risky states at future time steps by learning an optimal policy. Experimental results show that the proposed framework performs well in identifying future `risky' states. Through this work we demonstrate the effectiveness of using probabilistic modeling (MDP) to predictively secure critical cloud infrastructures.

cs.AI↗