Nikolaos Alexopoulos

nameNikolaos Alexopoulos
positionResearch Assistant
eMailalexopoulos(AT)tk(dot)tu-darmstadt(dot)de
phone+49 (6151) 16 - 23199
fax+49 (6151) 16 - 23202
officeS2|02 A312
postal addressTU Darmstadt - FB 20
FG Telekooperation
Hochschulstraße 10
D-64289 Darmstadt
Germany

Research Interests

  • Computational Trust
  • Cryptography
  • Anonymous Communication

Short bio

I am a doctoral researcher at the Telecooperation lab since May 2016, working as a part of CROSSING collaborative research center. Prior to joining Technische Universität Darmstadt, I obtained my diploma from the School of Electrical and Computer Engineering (ECE) of the National Technical University of Athens (NTUA).

I am interested in many aspects of computer science including cryptography, computational trust and network security. My research focuses on applying computational trust in the context of computer security and using blockchain technology for securing trust management infrastructures.

Apart from research, I very much enjoy sports, especially basketball and football.

Publications

Towards Blockchain-Based Collaborative Intrusion Detection Systems

Author Nikolaos Alexopoulos, Emmanouil Vasilomanolakis, Natalia Reka Ivanko, Max Mühlhäuser
Date October 2017
Kind Inproceedings
PublisherSpringer-Verlag
Book titleInternational Conference on Critical Information Infrastructures Security
Note to appear
LocationLucca, Italy
KeyTUD-CS-2017-0189
Research Areas CROSSING, S1, CYSEC, SPIN: Smart Protection in Infrastructures and Networks, CRISP, Telecooperation
Abstract In an attempt to cope with the increased number of cyberattacks, research in Intrusion Detection Systems (IDSs) is moving towards more collaborative mechanisms. Collaborative IDSs (CIDSs) are such an approach; they combine the knowledge of a plethora of monitors to generate a holistic picture of the monitored network. Despite the research done in this field, CIDSs still face a number of fundamental challenges, especially regarding maintaining trust among the collaborating parties. Recent advances in distributed ledger technologies, e.g. various implementations of blockchain protocols, are a good fit to the problem of enhancing trust in collaborative environments. This paper touches the intersection of CIDSs and blockchains. Particularly, it introduces the idea of utilizing blockchain technologies as a mechanism for improving CIDSs. We argue that certain properties of blockchains can be of significant benefit for CIDSs; namely for the improvement of trust between monitors, and for providing accountability and consensus. For this, we study the related work and highlight the research gaps and challenges towards such a task. Finally, we propose a generic architecture for the incorporation of blockchains into the field of CIDSs and an analysis of the design decisions that need to be made to implement such an architectu#re.
Website http://www.critis2017.org
Full paper (pdf)
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Teaching Activities

  • Seminar Telekooperation WS 16/17
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