Visible to the public Biblio

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Savva, G., Manousakis, K., Ellinas, G..  2020.  Providing Confidentiality in Optical Networks: Metaheuristic Techniques for the Joint Network Coding-Routing and Spectrum Allocation Problem. 2020 22nd International Conference on Transparent Optical Networks (ICTON). :1—4.
In this work, novel metaheuristic algorithms are proposed to address the network coding (NC)-based routing and spectrum allocation (RSA) problem in elastic optical networks, aiming to increase the level of security against eavesdropping attacks for the network's confidential connections. A modified simulated annealing, a genetic algorithm, as well as a combination of the two techniques are examined in terms of confidentiality and spectrum utilization. Performance results demonstrate that using metaheuristic techniques can improve the performance of NC-based RSA algorithms and thus can be utilized in real-world network scenarios.
Koumidis, K., Kolios, P., Ellinas, G., Panayiotou, C. G..  2019.  Secure Event Logging Using a Blockchain of Heterogeneous Computing Resources. 2019 IEEE Global Communications Conference (GLOBECOM). :1—6.

Secure logging is essential for the integrity and accountability of cyber-physical systems (CPS). To prevent modification of log files the integrity of data must be ensured. In this work, we propose a solution for secure event in cyberphysical systems logging based on the blockchain technology, by encapsulating event data in blocks. The proposed solution considers the real-time application constraints that are inherent in CPS monitoring and control functions by optimizing the heterogeneous resources governing blockchain computations. In doing so, the proposed blockchain mechanism manages to deliver events in hard-to-tamper ledger blocks that can be accessed and utilized by the various functions and components of the system. Performance analysis of the proposed solution is conducted through extensive simulation, demonstrating the effectiveness of the proposed approach in delivering blocks of events on time using the minimum computational resources.