Hari N. N. currently serves as a Research Associate at  Amrita Center School for Cybersecurity Systems and Network, Amritapuri Campus. He pursued his B.Sc. Mathematics from NSS College Ottapalam and MCA from REC Calicut, Calicut University in 1997. 


Publication Type: Conference Proceedings

Year of Publication Publication Type Title


Conference Proceedings

N. Manmadhan, Hari, N. N., Jayaraj Poroor, and Achuthan, K., “Design for Prevention of Intranet Information Leakage via Emails”, Security in Computing and Communications: Second International Symposium, SSCC 2014, Proceedings of Communications in Computer and Information Science, vol. 467. Springer Berlin Heidelberg, Berlin, Heidelberg, pp. 136–148, 2014.[Abstract]

The ubiquitous presences of internet and network technologies have enabled electronic mail systems as the primary medium of communication. Both between and within organizations, sensitive and personal information often transits through the electronic mail systems undetected. Information leakage through this mode of communication has become a daunting problem in today’s world. Often the mail volume within an organization is quite large making manual monitoring impossible. In this paper an integration of secure information flow techniques on intranet electronic mail systems is investigated. Categorization of emails based on the sensitivity is accomplished effectively using machine learning techniques. Analyzing the information flow and simultaneously mapping, categorizing and sorting emails in real time prior to receipt of emails has been characterized in this study.  Defining security policies and application of lattice models for controlled exchange of emails is discussed. The paper proposed a secure architecture for an email web application. Experimental analysis on the accuracy of the application was determined using Enron email dataset. More »»

Publication Type: Book Chapter

Year of Publication Publication Type Title


Book Chapter

S. Sundararajan, Hari, N. N., Pavithran, V., Vorungati, K., and Achuthan, K., “Preventing Insider Attacks in the Cloud”, in Advances in Computing and Communications: First International Conference, ACC 2011, Kochi, India, July 22-24, 2011. Proceedings, Part I, A. Abraham, Mauri, J. Lloret, Buford, J. F., Suzuki, J., and Thampi, S. M., Eds. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011, pp. 488–500.[Abstract]

Cloud computing is becoming popular due to its ability to provide dynamic scalability and elasticity of resources at affordable cost. In spite of these advantages key concerns that prevent large scale adoption of cloud computing today are related to security and privacy of customer’s data in the cloud. The main security concerns of clients are loss of direct control of their data and being forced to trust a third party provider with confidential information. Among security threats in the cloud, insider threats pose a serious risk to clients. This paper presents a new access control mechanism that can mitigate security threats in the cloud including those caused by insiders, such as malicious system administrators. The problem is challenging because the cloud provider’s system administrators have elevated privileges for performing genuine system maintenance and administration tasks. We describe an access control mechanism that generates immutable security policies for a client, propagates and enforces them at the provider’s infrastructure.

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Publication Type: Conference Paper

Year of Publication Publication Type Title


Conference Paper

Shiju Sathyadevan, Kallingalthodi, H., and Hari, N. N., “IRIGNET - Intelligent communication network for power-scarce rural India”, in ACWR 2011 - Proceedings of the International Conference on Wireless Technologies for Humanitarian Relief, Amritapuri, 2011, pp. 465-471.[Abstract]

Considering the contribution agriculture has made towards India's rapid raise in economic status, its relevance to the nation's subjects, its depth and far reaching wing span across the length and breadth of the country and foremost to account for the turmoil through which the farming community in India is going through under the current circumstances, it does deserve to be treated with higher reverence and priority. Although agriculture has made enormous contribution towards India's rapid raise in economic status, accounting for nearly 20% of the GDP and the livelihood for 58% of the population, the farmers who are the mainstay of this industry face a lot of problems in raising crops and sustaining production. This paper proposes a system that will automate the irrigation system, especially in rural India, to compensate for the flimsy, inconsistent and unreliable power supply system. Suggested design uses a Central regional scheduler server hosting an intelligent software working alongside with remote microcontroller based sensors to get up to date environmental parameters so as to assist it to work out the best array of water pumps to be turned on at a given instance. Sensor devices are kept at the vicinity of where the water pumps are so that influential decision making parameters can be sensed and fed to the intelligent software stationed at the central server. It uses mobile technology to handshake between the central server and the sensor controllers. Various derivatives of the same are discussed which need to be weighed in terms of their practicality, ease of deployment and of course the cost factor. It also helps the nation to preserve both water and electricity by enforcing controlled but adequate usage of the same. More »»

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