As of February 2024, I am an MSCA postdoctoral fellow at Prof. Spinellis' Business Analytics Laboratory of the Athens University of Economics and Business. My MSCA project is SPUCS, aiming to provide users more control over their smart devices via transparency mechanisms and novel software architectures. Before joining AUEB, I was a postdoctoral researcher at the Telecooperation Lab of TU Darmstadt, Germany, where I had previously become a Dr.-Ing. with my dissertation titled New Approaches to Software Security Metrics and Measurements. I am interested in all aspects of computer security and privacy, with a focus on metrics and measurements of software security, transparency for mobile devices, and decentralized computing. For more information about me you can take a look at my CV.
Nikolaos Alexopoulos
alexopoulos at aueb.gr
Department of Management Science and Technology
Athens University of Economics and Business
Athens
Greece
News
- Dec 2025: Two papers accepted at ACM SAC 2026 on mobile security and transparency with students from the Department of Management Science & Technology of AUEB.
- Oct 2025: I visited the Software Engineering research unit of TU Wien for two weeks.
- Oct 2025: Over the summer, I got the chance to review some very interesting security papers, being in the Technical Program Committee for ACSAC, ICSE, and NDSS.
- Sep 2024: Our work on vulnerability lifetimes [link] was featured in a Google Security Blog post [link] discussing the effects on security of transitioning to memory-safe languages in the Android project.
- Feb 2024: I moved to AUEB and started my MSCA project SPUCS (Software architectures for Secure, Private, User-Controlled Smart devices).
Projects
MSCA Postdoctoral Felowship SPUCS- SPUCS My MSCA PF project SPUCS: Software architectures for Secure, Private, User-Controlled Smart devices aims to provide users more transparency and control over their mobile devices via novel monitoring and isolation methods.
Selected Publications
Peer-reviewed- An Empirical Comparison of Security and Privacy Characteristics of Android Messaging Apps. Ioannis Karyotakis, Foivos-Timotheos Proestakis, Evangelos Talos, Diomidis Spinellis and Nikolaos Alexopoulos. In the 41st ACM/SIGAPP Symposium On Applied Computing (ACM SAC 2026). Poster paper. To appear.
- Measuring the Performance of Candidate Verifiable Credential Schemes for the EU Digital Identity Wallet. Angelos Ioannis Lagos, Diomidis Spinellis and Nikolaos Alexopoulos. In the 41st ACM/SIGAPP Symposium On Applied Computing (ACM SAC 2026). To appear.
- Towards Democratic Computing. Max Mühlhäuser, Nikolaos Alexopoulos, Uwe Gropengießer, Kamran Razavi, Lin Wang. In From Multimedia Communications to the Future Internet - Essays Dedicated to Ralf Steinmetz on the Occasion of His Retirement, 2024.
- New Approaches to Software Security Metrics and Measurements. Nikolaos Alexopoulos. Dissertation (2022)
- How Long Do Vulnerabilities Live in the Code? A Large-Scale EmpiricalMeasurement Study on FOSS Vulnerability Lifetimes. Nikolaos Alexopoulos, Manuel Brack, Jan Wagner, Tim Grube, Max Mühlhäuser. In USENIX Security 2022 (CORE A*).
- Who are Vulnerability Reporters?: A Large-scale Empirical Study on FLOSS. Nikolaos Alexopoulos, Andrew Meneely, Dorian Arnouts, Max Mühlhäuser. In ESEM '21 (CORE A).
- The Tip of the Iceberg: On the Merits of Finding Security Bugs. Nikolaos Alexopoulos, Sheikh Habib, Steffen Schulz, Max Mühlhäuser. In ACM Trans. Priv. Secur. (ACM TOPS), 2020.
- TRIDEnT: towards a decentralized threat indicator marketplace. Nikolaos Alexopoulos, Emmanouil Vasilomanolakis, Stephane Roux, Steven Rowe, Max Mühlhäuser. In SAC '20: The 35th ACM/SIGAPP Symposium on Applied Computing.
- Assessing the Threat of Blockchain-based Botnets. Leon Böck, Nikolaos Alexopoulos, Emine Saracoglu, Max Mühlhäuser, Emmanouil Vasilomanolakis. In eCrime 2019.
- Trust4App: Automating Trustworthiness Assessment of Mobile Applications. Sheikh Habib, Nikolaos Alexopoulos, Md Islam, Jens Heider, Stephen Marsh, Max Mühlhäuser. In IEEE TrustCom 2018.
- Towards Secure Distributed Trust Management on a Global Scale: An analytical approach for applying Distributed Ledgers for authorization in the IoT. Nikolaos Alexopoulos, Sheikh Habib, Max Mühlhäuser.IoT S&P@SIGCOMM 2018.
- Towards Blockchain-Based Collaborative Intrusion Detection Systems. Nikolaos Alexopoulos, Emmanouil Vasilomanolakis, Natalia Ivanko, Max Mühlhäuser. In CRITIS 2017.
- MCMix: Anonymous Messaging via Secure Multiparty Computation. Nikolaos Alexopoulos, Aggelos Kiayias, Riivo Talviste, Thomas Zacharias. In USENIX Security 2017 (CORE A*).
- Beyond the Hype: On Using Blockchains in Trust Management for Authentication. Nikolaos Alexopoulos, Jörg Daubert, Max Mühlhäuser, Sheikh Habib. In IEEE TrustCom 2017
- SliceDroid: Towards Reconstructing Android Application I/O Behaviors from Kernel Traces. Nikolaos Alexopoulos, Simon Althaus, Diomidis Spinellis. Technical report 2025.
- M-STAR: A Modular, Evidence-based Software Trustworthiness Framework. Nikolaos Alexopoulos, Sheikh Habib, Steffen Schulz, Max Mühlhäuser. Arxiv technical report 2018.
Academic Service
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Program Committee Member
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Reviewer
Teaching
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Trusted and Secure Software Development [link]
Talks
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“Vulnerability Lifetimes and more”
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“Reconstructing Android Application I/O Behaviors from Kernel Traces”
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“Vulnerability lifecycles”
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“New Approaches to Software Security Metrics”