Felix Günther





I am a postdoctoral researcher in the Cryptography and Complexity Theory (Cryptoplexity) group led by Marc Fischlin at the Computer Science Department of Technische Universität Darmstadt, Germany. I obtained my Ph.D. in Computer Science from TU Darmstadt in February 2018 under the supervision of Marc Fischlin. Prior to that, I studied Computer Science and IT Security at TU Darmstadt. I am a member of the Collaborative Research Center CROSSING at TU Darmstadt and a member of the IACR.

Research Interests

I am interested in applied cryptography and computer security, with a particular focus on provable security and interest in narrowing the gap between the theoretical understanding and practical security of real-world cryptographic systems. In my work so far I especially investigated the provable security of (Internet) cryptographic protocols for key exchange and secure channels. More broadly, I studied the privacy and security of cryptographic protocols, privacy-preserving cryptography (incl. homomorphic encryption, key management, and signatures), and cryptographic security in online social networks.

Academic Career and Education

since 2018Postdoctoral researcher in the Cryptography and Complexity Theory (Cryptoplexity) group at TU Darmstadt
2013–2018Ph.D. in Computer Science, TU Darmstadt
2010–2013M.Sc. in Computer Science, TU Darmstadt
2010–2013M.Sc. in IT Security, TU Darmstadt
2007-2010B.Sc. in Computer Science, TU Darmstadt

Awards and Honors

2018Best Teaching Award for Lecture Real World Crypto, TU Darmstadt, summer term 2017 (teaching assistant)
2017CROSSING Collaboration Award 2017
2015Best student paper award at ACISP 2015
2011Laureate of the CAST Award IT Security (CAST-Förderpreis IT-Sicherheit): 2nd prize in the category "Bachelor and Study Theses" for my bachelor thesis "Cryptographic Treatment of Private User Profiles"
2007-2013Scholarship from the German National Academic Foundation (Studienstiftung des deutschen Volkes)

Professional Activities

May 2019EUROCRYPT 2019 Workshop General Co-Chair
Sep 2018Speaker at the ECRYPT-NET School on Integrating Advanced Cryptography with Applications
Feb-Dec 2011Collaboration in the project "Group Signatures: Privacy-Preserving Authentication Methods", a survey for the BSI (German Federal Office for Information Security), of the Cryptographic Protocols Group at TU Darmstadt
The resulting survey can be found at www.bsi.bund.de.

Research Visits

Mar 2017 UC San Diego, La Jolla, CA, USA – Security and Cryptography Group
Host: Prof. Mihir Bellare
Feb 2017 Stanford University, Stanford, CA, USA – Applied Cryptography Group
Host: Prof. Dan Boneh
Jan 2017 Cornell Tech University, New York City, NY, USA – Security Group
Host: Prof. Thomas Ristenpart
Johns Hopkins University, Baltimore, MD, USA – Information Security Institute
Host: Prof. Matthew D. Green
IBM T.J. Watson Research Center, Yorktown Heights, NY, USA – Cryptography Research Group
Host: Dr. Hugo Krawczyk
Apr 2016 Ruhr-Universität Bochum, Bochum, Germany – Lehrstuhl für Netz- und Datensicherheit
Hosts: Prof. Dr. Jörg Schwenk and Dr. Tibor Jager
Jun-Jul 2015 Queensland University of Technology, Brisbane, Australia – Information Security Discipline
Host: Senior Lecturer Dr. Douglas Stebila
May 2015 Technische Universität Dresden, Dresden, Germany – Lehrstuhl für Datenschutz und Datensicherheit
Host: Prof. Dr. Thorsten Strufe
Jan 2015 Royal Holloway, University of London, Egham, UK – Information Security Group
Host: Prof. Kenneth G. Paterson

Peer Reviewing for Scientific Conferences and Journals

  • 2018: ACM CCS
  • 2017: EUROCRYPT, PKC, ACISP, Latincrypt
  • 2016: CRYPTO
  • 2015: Latincrypt, ACM CCS
  • 2014: INFOCOM, TCC, ACNS, ASIACRYPT, Elsevier Information Processing Letters
  • 2013: Elsevier Computer Communications Journal

Research Impact and Media Attention


Technische Universität Darmstadt

  • summer term 2018: Teaching assistant for the lecture Real World Crypto by Marc Fischlin
  • summer term 2018: Organization of the graduate-level seminar Reading the Crypto Classics
  • winter term 2017/2018: Organization of the graduate-level seminar Reading the Crypto Classics
  • summer term 2017: Teaching assistant for the lecture Real World Crypto by Marc Fischlin
    (Best Teaching Award)
  • winter term 2016/2017: Teaching assistant for the research seminar Research-Oriented Cryptography by Marc Fischlin
  • winter term 2015/2016: Teaching assistant for the lecture Functional and Object-oriented Programming Concepts (Funktionale und objektorientierte Programmierkonzepte, ex. Grundlagen der Informatik 1) by Marc Fischlin
  • winter term 2013/2014: Teaching assistant for the lecture Introduction to Computer Science 1 (Grundlagen der Informatik 1) by Marc Fischlin
  • winter term 2011/2012: Teaching assistant (tutor) for the lecture Introduction to Cryptography (Einführung in die Kryptographie) by Marc Fischlin

Felix Günther

Dr. rer. nat. Felix Günther

Technische Universität Darmstadt
Department of Computer Science
Cryptography and Complexity Theory Group
Mornewegstrasse 30
64293 Darmstadt

Office:S4|14 4.3.21
Phone:+49 6151 16-25733

Technische Universität Darmstadt

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