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Bells Corners, Canada

Khalifa T.,University of Waterloo | Abdrabou A.,United Arab Emirates University | Naik K.,University of Waterloo | Alsabaan M.,University of Waterloo | And 2 more authors.
2012 IEEE 3rd International Conference on Smart Grid Communications, SmartGridComm 2012 | Year: 2012

This paper investigates the TCP's congestion control mechanism effectiveness for smart meters. We show that the classic congestion control causes a high loss rate for metered data and disrupts competing traffic flows in a shared network. © 2012 IEEE.

Lim N.,Carleton University | Majumdar S.,Carleton University | Srivastava V.,Cistech Ltd
2012 IEEE 31st International Performance Computing and Communications Conference, IPCCC 2012 | Year: 2012

Sending documents containing sensitive information is commonly performed on distributed systems. To protect the sensitive data in the documents, these documents need to be transmitted over a secure channel. However, secure communications can often increase the data transmission time due to the CPU-intensive operations (e.g. encryption/decryption) that need to be applied to the data before the data transfer. This paper focuses on a performance optimization technique called security sieve, which aims to enhance the performance of SSL/TLS-based data transmission. Security sieve reduces the transmission time of transferring classified documents, which may also contain non-sensitive data, by minimizing the time spent performing the CPU-intensive security-related operations. This paper focuses on highlighting the performance optimization principles/performance patterns that were used and includes a discussion of a prototype implementation. In addition, experimental results are presented to demonstrate the performance enhancement provided by security sieve. © 2012 IEEE.

Lim N.,Carleton University | Majumdar S.,Carleton University | Srivastava V.,Cistech Ltd
International Journal of Parallel, Emergent and Distributed Systems | Year: 2015

Providing secure communication in distributed systems often introduces a performance penalty due to the CPU-intensive operations used by security protocols such as the Secure Sockets Layer (SSL) protocol. This paper proposes a technique, called security sieve, which enhances the performance of SSL-based document transmission. Security sieve separates the sensitive components from the non-sensitive components, and transmits the separated components over a secure channel and a (faster) non-secure channel, respectively. At the receiving end, the separated components are re-assembled to reconstruct the original document. A significant performance improvement with security sieve is observed for a number of system and workload parameters. © 2015 Taylor & Francis

Balakrishnan D.,Cistech Ltd | Nayak A.,University of Ottawa
Proceedings of the 2010 International Conference on Network and Service Management, CNSM 2010 | Year: 2010

Presently, smart interconnected heterogeneous devices with built-in GPS, Wi-Fi, and Bluetooth capabilities are more affordable, resulting in numerous novel mobile applications. To adapt applications based on the environment they are executed in, we perform context management by proactively monitoring the (network- and location-based) context information available in such devices and applications. As this requires continuous monitoring, the common fixed data flow based technique for forwarding contexts from multiple context sensors is not energy efficient. In this paper, we propose the design and implementation of an adaptive context monitoring scheme. Alongside context awareness, we employ overlay network, agent, and policy theories. We utilize learning and personalization characteristics to make an optimized judgment of context information in an efficient and scalable fashion. This paper is complemented with protocol evaluations to validate scalability claims based on real logs. © 2010 IEEE.

Khalifa T.,University of Waterloo | Abdrabou A.,United Arab Emirates University | Naik K.,University of Waterloo | Alsabaan M.,King Saud University | And 2 more authors.
IEEE Transactions on Smart Grid | Year: 2014

This paper introduces our proposed Split-and Aggregated-TCP (SA-TCP) scheme's enhanced TCP performance in a smart metering infrastructure (SMI). The scheme is based on upgrading intermediate devices (e.g., regional collectors) to aggregate TCP connections. An SA-TCP aggregator collects data packets from smart meters in a certain region over separate TCP connections, then reliably aggregates them in one TCP connection to the management server of the utility. Our proposed scheme responds better to data traffic dynamics of smart meters and makes TCP congestion control effective. © 2013 IEEE.

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