I am a Computer Science Professor (W3) at the Rheinische Friedrich-Wilhelms-Universität Bonn and a member of the Fraunhofer FKIE in Bonn. My research interests lie in the intersection of technical IT security & privacy and behavioural research. I study the interaction effects between technical and psychological, social, economic, cognitive, and emotional factors related to the security and privacy behaviour of individuals and institutions.


Usability problems are a major cause of many of today’s IT-security incidents. Security systems are often too complicated, time-consuming, and error prone. For more than a decade researchers in the domain of usable security (USEC) have attempted to combat these problems by conducting interdisciplinary research focusing on the root causes of the end-user problems and on the creation of usable security mechanisms. I am currently particularly focusing on the human factors of experts such as IT administrators and developers, since many of the most catastrophic security incidents were not caused by end-users, but by developers or administrators. Heartbleed and Shellshock were both caused by single developers yet had global consequences. The recent Sony hack compromised an entire multi-national IT-infrastructure and misappropriated over 100 TB of data, unnoticed. Fundamentally, every software vulnerability and misconfigured system is caused by developers or administrators making mistakes. My group and I are studying these kind of incidents and developing strategies to prevent them from happening in the future.


Academic Service


  • IEEE EuroS&P'17 PC Co-Chair
  • USENIX SOUPS'17 PC Co-Chair
  • USENIX SOUPS'16 PC Co-Chair
  • WWW’15 Area PC Chair Security and Privacy
  • NDSS’15 Workshop Chair
  • Associate Editor ACM Transaction on the Web
  • USEC’14 Workshop Co-Chair
  • NDSS Organising Committee
  • USENIX SOUPS Steering Committee
  • Financial Crypto

Board of Directors

  • USEC Steering Committee


Program Committees


  • IEEE S&P'14,15,16
  • IEEE EuroS&P'16
  • ACM CCS'14,15
  • SOUPS'14,15
  • USEC'14
  • FC'13,14



I am very lucky to work with many very talented students. Currently I am supervising:


  • Karoline Busse
  • Anastasia Danilova
  • Sergej Dechand
  • Ismail Khoffi
  • Alena Naiakshina
  • Henning Perl
  • Christian Tiefenau
  • Khaled Yakdan


Institute of Computer Science 4

Friedrich-Ebert-Allee 144

53113 Bonn



Phone: +49 228 73 54 218

Fax: +49 228 73-4571


Room: II.36






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