Nikolaos Alexopoulos


Dr.-Ing. Nikolaos Alexopoulos

Research Assistant

+49 6151 16-20108
+49 6151 16-23202

Hochschulstraße 10
64289 Darmstadt

Raum: S2|02 A313

Mehr Informationen

Research Interests

  • Computational Trust
  • Cryptography
  • Anonymous Communication

Short bio

I am a doctoral researcher at the Telecooperation lab since May 2016. 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, aiming to create trust on systems and between people. My current thesis research focuses on improving defences against zero-day attacks by probabilistically assessing the security strength of software and incentivizing collaboration among defenders. Other research projects I am currently involved in are: decentralized applications using smart contracts (security alert marketplace, decentralized energy trading in developing countries), and password strength estimation.

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


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Gruppiere nach: Publikationsjahr | Typ des Eintrags | Keine Gruppierung
Springe zu: 2021 | 2020 | 2019 | 2018 | 2017
Anzahl der Einträge: 15.


Alexopoulos, Nikolaos ; Meneely, Andy ; Arnouts, Dorian ; Mühlhäuser, Max (2021):
Who are Vulnerability Reporters? A Large-scale Empirical Study on FLOSS.
Bari, Italy, ACM, 15th ACM/IEEE International Symposium on Empirical Software Engineering and Measurement (ESEM '21), virtual conference, Mon 11 - Fri 15 October 2021, DOI: 10.1145/3475716.3475783,


Alexopoulos, Nikolaos ; Habib, Sheikh Mahbub ; Schulz, Steffen ; Mühlhäuser, Max (2020):
The Tip of the Iceberg: On the Merits of Finding Security Bugs.
In: ACM Transactions on Privacy and Security, 24 (1), Association for Computing Machinery, ISSN 2471-2566,
DOI: 10.1145/3406112,

Alexopoulos, Nikolaos ; Vasilomanolakis, Emmanouil ; Le Roux, Stephane ; Rowe, Steven ; Mühlhäuser, Max (2020):
TRIDEnT: Towards a Decentralized Threat Indicator Marketplace.
S. 332-341, ACM, 35th ACM/SIGAPP Symposium on Applied Computing (SAC'20), virtual Conference, 30.03.-03.04., ISBN 978-1-4503-6866-7,
DOI: 10.1145/3341105.3374020,


Böck, Leon ; Alexopoulos, Nikolaos ; Saracoglu, Emine ; Mühlhäuser, Max ; Vasilomanolakis, Emmanouil (2019):
Assessing the threat of blockchain-based botnets.
IEEE, APWG Symposium on Electronic Crime Research (eCrime2019), Pittsburgh, USA, 13.11.-15.11., ISBN 978-1-7281-6384-0,
DOI: 10.1109/eCrime47957.2019.9037600,

Alexopoulos, Nikolaos ; Egert, Rolf ; Grube, Tim ; Mühlhäuser, Max
Cavallaro, Lorenzo ; Kinder, Johannes ; Wang, XiaoFeng ; Katz, Jonathan (Hrsg.) (2019):
Poster: Towards Automated Quantitative Analysis and Forecasting of Vulnerability Discoveries in Debian GNU/Linux.
S. 2677-2679, ACM SIGSAC Conference on Computer and Communications Security, CCS 2019, London, UK, November 11-15, 2019, DOI: 10.1145/3319535.3363285,

Alexopoulos, Nikolaos ; Vasilomanolakis, Emmanouil ; Le Roux, Stephane ; Rowe, Steven ; Mühlhäuser, Max (2019):
TRIDEnT: Building Decentralized Incentives for Collaborative Security.
In: Cryptography and Security, (Preprint), 1. Version, arXiv, 1905.03571, [Report]


Habib, Sheikh Mahbub ; Alexopoulos, Nikolaos ; Islam, Md Monirul ; Heider, Jens ; Marsh, Stephen ; Mühlhäuser, Max (2018):
Trust4App: Automating Trustworthiness Assessment of Mobile Applications.
S. 124-135, IEEE, 17th IEEE International Conference On Trust, Security And Privacy In Computing And Communications (TrustCom) / 12th IEEE International Conference On Big Data Science And Engineering (BigDataSE), New York, USA, 31.07.-03.08.2018, ISBN 978-1-5386-4389-1,
DOI: 10.1109/TrustCom/BigDataSE.2018.00029,

Alexopoulos, Nikolaos ; Habib, Sheikh Mahbub ; Mühlhäuser, Max (2018):
Towards Secure Distributed Trust Management on a Global Scale.
S. 49-54, ACM, IoT S&P’18: ACM SIGCOMM 2018 Workshop on IoT Security and Privacy, Budapest, Hungary, 20.-25.08, ISBN 978-1-4503-5905-4,
DOI: 10.1145/3229565.3229569,

Alexopoulos, Nikolaos ; Habib, Sheikh Mahbub ; Schulz, Steffen ; Mühlhäuser, Max (2018):
M-STAR: A Modular, Evidence-based Software Trustworthiness Framework.
In: Cryptography and Security, (Preprint), 1. Version, arXiv, 1801.05764, [Report]


Alexopoulos, Nikolaos ; Vasilomanolakis, Emmanouil ; Ivanko, Natalia Reka ; Mühlhäuser, Max (2017):
Towards Blockchain-Based Collaborative Intrusion Detection Systems.
S. 107-118, Springer, 12th International Conference on Critical Information Infrastructures Security (CRITIS 2017), Lucca, Italy, 08.-13.10 2017, ISBN 978-3-319-99842-8,
DOI: 10.1007/978-3-319-99843-5_10,

Alexopoulos, Nikolaos ; Daubert, Jörg ; Mühlhäuser, Max ; Habib, Sheikh Mahbub (2017):
Beyond the Hype: On Using Blockchains in Trust Management for Authentication.
In: IEEE TrustCom 2017, S. 546-553,
IEEE, Sydney, Australia, 1-4 August 2017, DOI: 10.1109/Trustcom/BigDataSE/ICESS.2017.283,

Alexopoulos, Nikolaos ; Kiayias, Aggelos ; Talviste, Riivo ; Zacharias, Thomas (2017):
MCMix: Anonymous Messaging via Secure Multiparty Computation.
In: 26th USENIX Security Symposium, S. 1217-1234,
USENIX Association, Vancouver, BC, Canada, 16-18 August 2018, [Konferenzveröffentlichung]

Alexopoulos, Nikolaos ; Vasilomanolakis, Emmanouil ; Ivanko, Natalia Reka ; Frieß, Tamara ; Mühlhäuser, Max (2017):
TRIDEnT: Trustworthy collaboRative Intrusion DETection (POSTER).
USENIX Association, 26th USENIX Security Symposium, Vancouver, Canada, 16.-18.08.2017, [Konferenzveröffentlichung]

Alexopoulos, Nikolaos (2017):
Student Research Abstract: On Enhancing Trust in Cryptographic Solutions.
In: Proceedings of the 32nd Annual ACM Symposium on Applied Computing,
New York, NY, USA, ACM, Marrakech, Morocco, 3-6 April 2017, DOI: 10.1145/3019612.3019921,

Champion de Crespigny, Angus ; Khovratovich, Dmitry ; Blondeau, Florent ; Sok, Klara ; Honigman, Philippe ; Alexopoulos, Nikolaos ; Petitcolas, Fabien ; Conway, Shaun (2017):
Design Considerations for Decentralized Reputation Systems.
Paris, A White Paper from the Rebooting the Web of Trust IV Design Workshop, [Report]

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