first.last (at) rub.de
I'm a professor of computer science at the Ruhr University Bochum and the Research Center for Trustworthy Data Science and Security. I work in security and privacy, focusing on information integrity in online platforms and using data science and machine learning to study security. Prior, I was an assistant professor at the University of Lausanne, a postdoctoral researcher at EPFL and a postdoctoral researcher in the Computer Security and Industrial Cryptography (COSIC) at KU Leuven in Belgium. I completed my Ph.D. in Computer Science at Drexel University in the College of Computing and Informatics under the direction of Rachel Greenstadt.
Research Output
- Kireev, K., Mykhno, Y., Troncoso, C., & Overdorf, R. A Telegram Dataset of Propaganda and its Moderation. Proceedings of the Ninteenth International AAAI Conference on Web and Social Media. ICWSM 2025
- Kireev, K., Mykhno, Y., Troncoso, C., & Overdorf, R. Characterizing and Detecting Propaganda-Spreading Accounts on Telegram. 34th USENIX Security Symposium. USENIX Security 25
- Breitinger, F. , Hilgert, J. and Hargreaves, C. and Sheppard, J. and Overdorf, R. Scanlon, M. DFRWS EU 10-year review and future directions in Digital Forensic Research. Forensic Science International: Digital Investigation. 2024
- Elmas, T. , Overdorf, R. , Akgül, Ö. F. , Aberer, K. Misleading Repurposing on Twitter. Proceedings of the International AAAI Conference on Web and Social Media, ICWSM 2023. 2023
- Gressel, C., Overdorf, R., Hagenstedt, I., Karaboga, M., Lurtz, H., Raschke, M., Bulling, A. Privacy-Aware Eye Tracking: Challenges and Future Directions. IEEE Pervasive Computing. 2023
- Elmas T., Ibanez T.R., Hutter A., Overdorf R., Aberer K. WayPop Machine: A Wayback Machine to Investigate Popularity and Root Out Trolls. Foundations of Open Source Intelligence and Security Informatics. 2022
- Elmas, T. , Overdorf, R. , Aberer, K. Characterizing Retweet Bots: The Case of Black Market Accounts. Proceedings of the International AAAI Conference on Web and Social Media. 2022
- Elmas T., Overdorf R., Aberer K. A Dataset of State-Censored Tweets. Proceedings of the Fifteenth International AAAI Conference on Web and Social Media, ICWSM 2021. 2021
- Elmas T., Overdorf R., Özkalay A.F., Aberer K. Ephemeral Astroturfing Attacks: The Case of Fake Twitter Trends. IEEE European Symposium on Security and Privacy, EuroS&P. 2021
- Elmas T., Overdorf R., Aberer K. Tactical Reframing of Online Disinformation Campaigns Against The Istanbul Convention. Workshop on Data for the Wellbeing of Most Vulnerable (ICWSM Workshop). 2021
- Kulynych* B., Overdorf* R., Troncoso C., Gürses S.F. POTs: protective optimization technologies. FAT* '20: Conference on Fairness, Accountability, and Transparency. 2020
- Schwartz C., Overdorf R. Disinformation from the Inside: Combining Machine Learning and Journalism to Investigate Sockpuppet Campaigns. CyberSafety (The Web Conference Workshop). 2020
- Elmas T., Hardi K., Overdorf R., Aberer K. Can Celebrities Burst Your Bubble?. Innovative Ideas in Data Science (The Web Conference Workshop). 2020
- Overdorf R., Kulynych B., Gürses S. A guide to revolutionary counter-optimization. Internet Freedom Festival (IFF). 2019
- Schwartz C., Overdorf R. Subtle Censorship via Adversarial Fakeness in Kyrgyzstan. In Workshop on Hot Topics in Privacy Enhancing Technologies (HotPETs). 2019
- Gürses S., Overdorf R., Balsa E. POTs: The revolution will not be optimized?. Workshop on Hot Topics in Privacy Enhancing Technologies (HotPETs). 2018
- Overdorf R., Kulynych B., Balsa E., Troncoso C., Gürses S. Questioning the assumptions behind fairness solutions. Critiquing and Correcting Trends in Machine Learning (NeurIPS Workshop). 2018
- Overdorf R., Troncoso C., Greenstadt R., McCoy D. Under the Underground: Predicting Private Interactions in Underground Forums. 2018
- Dauber E., Overdorf R., Greenstadt R. Stylometric authorship Attribution of Collaborative Documents. Cyber Security Cryptography and Machine Learning, (CSCML). 2017
- Overdorf R., Juárez M., Acar G., Greenstadt R., Díaz C. How Unique is Your .onion?: An Analysis of the Fingerprintability of Tor Onion Services. ACM SIGSAC Conference on Computer and Communications Security, CCS. 2017
- Overdorf R., Greenstadt R. Blogs, Twitter Feeds, and Reddit Comments: Cross-domain authorship Attribution. Proceedings on Privacy Enhancing Technologies (PoPETs). 2016
- Garg V., Afroz S., Overdorf R., Greenstadt R. Computer-Supported Cooperative Crime. Financial Cryptography and Data Security (FC). 2015
- Stolerman A., Overdorf R., Afroz S., Greenstadt R. Breaking the Closed-World Assumption in Stylometric authorship Attribution. Advances in Digital Forensics X (IFIP WG). 2014
- Overdorf R., Dutko T., Greenstadt R. Blogs and Twitter Feeds: A Stylometric Environmental Impact Study. Workshop on Hot Topics in Privacy Enhancing Technologies (HotPETs). 2014
- Overdorf R., Islam A.C., Greenstadt R. Source Code and Cross Domain Stylometry. Role of Stylometry in Privacy. Chaos Communication Congress (CCC). 2014
- Overdorf R., Lang M. Reaching out to aid in retention: empowering undergraduate women. ACM Technical Symposium on Computer science Education (SIGCSE). 2011
