Johannes Lohmöller, M.Sc.

Johannes Lohmöller, M.Sc.

Researcher

Ahornstraße 55, building E3 52074 Aachen Germany
9018
+49 241 80-21421
johannes.lohmoeller@comsys.rwth-aachen.de

Short CV

Since November 2021, I am a researcher at the Chair of Communication and Distributed Systems. Before, I graduated with an M.Sc. in Computer Science at RWTH Aachen University. I am part of the Security and Privacy Group, and my research centers around privacy-preserving methods such as confidential computing and homomorphic encryption, and understanding their implications, especially in the context of medical use cases.

Looking for a Thesis?

Great! I always seek motivated students interested in improving privacy-preserving methods in today’s distributed systems and analyzing their security. Email me two sentences on your motivation and research interests. Also, include a recent transcript of records or another reference, and we might figure out a suitable thesis topic together.

Due to high demand, I might hand out a quick introductory challenge before starting a new thesis.

Teaching Activities

I am/have been involved in the following teaching activities at RWTH Aachen University:

SS 2025
Seminar on Advanced Internet Technology (1 advised topics; M course)

WS 2024/25
Research Focus Class on Medical Data Privacy (1 of 5 advisors; M course)
Seminar on Advanced Internet Technology (2 advised topics; M course)

SS 2024
Seminar on Advanced Internet Technology (2 advised topics; M course)

WS 2023/24
Seminar on Internet Technology (1 advised topics; B course)
Research Focus Class on Medical Data Privacy (1 of 3 advisors; M course)

SS 2023
Seminar on Internet Technology (2 advised topics; B course)

WS 2022/23
Seminar on Internet Technology (2 advised topics; B course)

SS 2022
Seminar on Internet Technology (2 advised topics; B course)
Practical Internet eXperience (PIX) Lab (1 advised project; M course)
Preseminar on Networks & Security (2 advised topics; B course)

WS 2021/22
Lab: Entwicklung eines Transportprotokolls (1 of 3 advisors; B course)
Seminar on Advanced Internet Technology (1 advised topic; M course)
Seminar on Internet Technology (1 advised topic; B course)

Publications

Between Promise and Practice: Challenges and Misperceptions of Applying Privacy Enhancing Technologies in Business Contexts. Proceedings of the 59th Hawaii International Conference on System Sciences (HICSS ‘26), Jan 6 - Jan 9, 2026, Lahaina, HI, USA. January 2026.
Forschungsorientierte Lehre in der Informatik: Das Konzept der Research Focus Class. Proceedings of the 11th Fachtagung Hochschuldidaktik Informatik (HDI ‘25), Sep 10 - Sep 11, 2025, Freiberg, Germany, co-located with the 23. Fachtagung Bildungstechnologien der Gesellschaft für Informatik e.V. (DELFI '25). September 2025.
Transformer-Based Integrative Patient Representations from Single-Cell RNA Data. Learning Meaningful Representations of Life Workshop (LMRL ‘25), Apr 28, 2025, Singapore, Singapore, co-located with the 13th International Conference on Learning Representations (ICLR '25). April 2025.
Complementing Organizational Security in Data Ecosystems with Technical Guarantees. Proceedings of the 1st Conference on Building a Secure and Empowered Cyberspace (BuildSEC ‘24), Dec 19 - Dec 20, 2024, New Delhi, India. December 2024.
PASTA-4-PHT: A Pipeline for Automated Security and Technical Audits for the Personal Health Train. arXiv. December 2024.
scE(match): Privacy-Preserving Cluster Matching of Single-Cell Data. Proceedings of the 23rd IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom ‘24), Dec 17 - Dec 21, 2024, Sanya, China. December 2024.
mcBERT: Patient-Level Single-cell Transcriptomics Data Representation. bioRxiv. November 2024.
Toward Technically Enforceable Consent in Healthcare Research. Research Papers of the 9th Interdisciplinary Annual Conference of the Privacy Platform, vol. 4, Oct 17 - Oct 18, 2024, Berlin, Germany. October 2024.
The Unresolved Need for Dependable Guarantees on Security, Sovereignty, and Trust in Data Ecosystems. Data & Knowledge Engineering, vol. 151. May 2024.
Unconsidered Installations: Discovering IoT Deployments in the IPv6 Internet. Proceedings of the 2024 IEEE/IFIP Network Operations and Management Symposium (NOMS ‘24), May 6 - May 10, 2024, Seoul, Korea. May 2024.
Poster: Bridging Trust Gaps: Data Usage Transparency in Federated Data Ecosystems. Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security (CCS ’23), Nov 26 - Nov 30, 2023, Copenhagen, Denmark. November 2023.
Designing Secure and Privacy-Preserving Information Systems for Industry Benchmarking. Advanced Information Systems Engineering. Lecture Notes in Computer Science, vol. 13901. Presented at the 35th International Conference on Advanced Information Systems Engineering (CAiSE '23), Jun 12 - Jun 16, 2023, Zaragoza, Spain. June 2023.
Use of Computation Ecosystems to Analyze the Kidney-Heart Crosstalk. Circulation Research, vol. 132, no. 8. April 2023.
On the Need for Strong Sovereignty in Data Ecosystems. Proceedings of the 1st International Workshop on Data Ecosystems (DEco ‘22), vol. 3306, Sep 5, 2022, Sydney, NSW, Australia, co-located with the 8th International Conference on Very Large Databases (VLDB '22). September 2022.
Missed Opportunities: Measuring the Untapped TLS Support in the Industrial Internet of Things. Proceedings of the 2022 ACM Asia Conference on Computer and Communications Security (ASIACCS ‘22), May 30 - Jun 2, 2022, Nagasaki, Japan. May 2022.
POSTER: How Dangerous is My Click? Boosting Website Fingerprinting By Considering Sequences of Webpages. Proceedings of the 28th ACM SIGSAC Conference on Computer and Communications Security (CCS ‘21), Seoul, Korea. November 2021.
Easing the Conscience with OPC UA: An Internet-Wide Study on Insecure Deployments. Proceedings of the ACM Internet Measurement Conference (IMC ‘20), Oct 27 - Oct 29, 2020, Pittsburgh, PA, USA. October 2020.

Advised Theses

Please note that ongoing theses are only visible from within the RWTH network. If you are not affiliated with RWTH Aachen University and you are interested in our topics, please contact us.

A Topic in Science Communication
Master's Thesis, RWTH Aachen University, September 2025
Examiners: Klaus Wehrle, Wil van der Aalst (PADS)
Exploring the Trade-Offs Between Utility and Privacy in Synthetic Genetic Datasets
Bachelor's Thesis, RWTH Aachen University, July 2025
Examiners: Klaus Wehrle, Sandra Geisler (DSMA)
A Topic in Privacy-Enhancing Technologies
Bachelor's Thesis, RWTH Aachen University, April 2025
Examiners: Klaus Wehrle, Sandra Geisler (DSMA)
A Topic in Usage Control
Bachelor's Thesis, RWTH Aachen University, April 2025
Examiners: Klaus Wehrle, Sandra Geisler (DSMA)
A Topic in Security & Privacy
Bachelor's Thesis, RWTH Aachen University, April 2025
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Privacy-Preserving Cluster-to-Cluster Matching for Single-Cell RNA Sequencing Data
Master's Thesis, RWTH Aachen University, December 2024
Advisors: Johannes Lohmöller, Jan Pennekamp, Sikander Hayat (UKA)
Examiners: Klaus Wehrle, Rafael Kramann (UKA)
Cross-Institutional Discovery of Rare-Disease Patients using Fully Homomorphic Encryption
Bachelor's Thesis, RWTH Aachen University, August 2024
Examiners: Klaus Wehrle, Felix Mottaghy (UKA)
A Topic in Security & Privacy
Master's Thesis, RWTH Aachen University, August 2024
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Towards a Confidentiality-Preserving Searchable Biomedical Imaging Format
Master's Thesis, RWTH Aachen University, May 2024
Examiners: Klaus Wehrle, Felix Mottaghy (UKA)
Towards automated classification of BES datapoints using semantic data models
Master's Thesis, RWTH Aachen University, May 2024
Advisors: Junsong Du (EBC, EONERC), Marwa Maghnie (EBC, EONERC), Johannes Lohmöller
Examiners: Klaus Wehrle, Dirk Müller (EBC, EONERC)
Informing Users About New Data in a Personal Health Train Infrastructure
Bachelor's Thesis, RWTH Aachen University, March 2024
Advisors: Johannes Lohmöller, Sascha Welten (i5)
Examiners: Klaus Wehrle, Stefan Decker (i5)
Oblivous Data Alignment for Privacy-Preserving Vertical Federated Learning
Master's Thesis, RWTH Aachen University, March 2024
Examiners: Klaus Wehrle, Daniel Truhn (UKA)
Toward similarity search across large distributed medical image data
Bachelor's Thesis, RWTH Aachen University, February 2024
Examiners: Klaus Wehrle, Bastian Leibe (Computer Vision)
TEE-based Verifiable Data Quality for Federated Learning
Bachelor's Thesis, RWTH Aachen University, January 2024
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Security & Privacy
Bachelor's Thesis, RWTH Aachen University, December 2023
Examiners: Klaus Wehrle, Walter Unger (i1)
Privacy-Preserving Data Discovery in Distributed Health Networks with Dynamic Consent
Master's Thesis, RWTH Aachen University, September 2023
Examiners: Klaus Wehrle, Walter Unger (i1)
A Privacy-Preserving Data Sharing Platform based on Trusted Execution Environments
Bachelor's Thesis, RWTH Aachen University, November 2022
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Towards Data Usage Transparency in Data Ecosystems
Bachelor's Thesis, RWTH Aachen University, October 2022
Examiners: Klaus Wehrle, Sandra Geisler (DSMA)
Applying Trusted Execution for Privacy-Preserving Company Benchmarking
Bachelor's Thesis, RWTH Aachen University, September 2022
Advisors: Johannes Lohmöller, Jan Pennekamp, Patrick Sapel (IKV)
Examiners: Klaus Wehrle, Christian Hopmann (IKV)
FOLKS Award for the best Bachelor's theses in 2022