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Tim Ohlendorf, M.Sc.

Wissenschaftlicher Mitarbeiter

Security researcher and PhD candidate in the area of mobile security and digital identities. Involved in several projects, regarding the security and privacy aspects of electronic identification (eIDAS, mDL, eHealth, Self-sovereign identities). Also interested in Android Hacking and the Human Factor in IT security.


  • 2021:   Team Lead Identity Management at Fraunhofer AISEC
  • 2019 - 2021: Security Researcher at Fraunhofer AISEC
  • 2018 - 2019: Research Assistant at Freie Universität Berlin
  • 2015 - 2018: M.Sc. in Computer Science at Technische Universität Darmstadt
  • 2012 - 2015: B.Sc in Computer Science at Darmstadt University of Applied Sciences


Ohlendorf, Tim, Studier, Wolfgang, and Marian Margraf. "SLIDEDroid: A Secure Lightweight Identity for the Android Platform". crypto day matters 31 (2019) [Extended Abstract]

Schwan, Matthias, Tim Ohlendorf. "Mobile-ID based on Secure Elements". Fraunhofer SmartCard Workshop (2019) [Proceedings]

Ohlendorf, Tim, Wolfgang Studier, and Marian Margraf. "Digitale Identitäten auf dem Smartphone". Datenschutz und Datensicherheit-DuD 43.1 (2019): 17-22 [Journal]

Ohlendorf, Tim. “Detecting Custom Cryptography In Android Applications.” (2018) [Thesis].

Otterbein, Florian, Tim Ohlendorf, and Marian Margraf. "The German eID as an Authentication Token on Android Devices." IJCSIS Vol. 14 No.12 (2016) [Journal]

Otterbein, Florian, Tim Ohlendorf, and Marian Margraf. "Mobile Authentication with German eID." IFIP Summer School (2016) [Extended Abstract]

Ohlendorf, Tim. "Machbarkeitsstudie zur Online-Ausweisfunktion des neuen Personalausweises unter Android." (2015) [Thesis]

Workshops and Talks

  • Moving Forward with Mobile Driving Licences - Panel Discussion - Identity Week 2020.
  • Designing and Implementing a Mobile European Student Card, 21st ISSE Conference 2019. Presentation Slides
  • SLIDEDroid: A Secure Lightweight Identity for the Android Platform, 31. Krypto-Tag 2019. Presentation Slides
  • Student eCard - Der digitale Studierendenausweis auf dem Smartphone, Research to Market Challenge 2019. Presentation Slides
  • Digital Identities on Mobile Devices, Digital Document Security 2019. Presentation Slides
  • Secure eID - Die Onlineausweisfunktion des nPA auf dem Smartphone, OmniSecure 2019. Presentation Slides
  • Mobile Authentication with German eID, IFIP Summer School 2016


  • Winter 18/19: Security Protocols and Infrastructure (Tutorial)
  • Summer 19: Machine Learning in the Context of IT Security (Seminar)
  • Winter 19/20: Security Protocols and Infrastructure
  • Summer 20: Machine Learning & IT-Security (Seminar)

Supervised Theses

  • Besendorf, Janik (2021). Automatic Detection of Android Device Security Properties. Bachelor thesis. Freie Universität Berlin.
  • Walter, Lilli (2021). The Threat of Sensor-based Covert Channels in Smart Homes. Master thesis. Freie Universität Berlin.
  • Dean, Lawrence (2020). Secure deployment, storage and use of a virtual health card on smartphones. Master thesis. Technische Universität Darmstadt.
  • Rösner, Julian (2020). Key Management for End-to-End Security Using the Example of the Electronic Health Record. Master thesis. Technische Universität Berlin