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Prof. Dr.-Ing. Tibor Jager

PD Dr.-Ing. Kai Gellert

Akademischer Oberrat
(tenured researcher)

gellert[at]uni-wuppertal.de

Campus Freudenberg
Building FME, Room 2.12

Google Scholar

Short Vita

  • 2025: Appointed Akademischer Oberrat auf Lebenszeit
    2024: Appointed Privatdozent (comparable to an associate professorship) in Computer Science, specializing in IT Security and Cryptography
  • 2024: Completed my habilitation and achieved the Lehrbefähigung (i.e., qualification to teach) in Computer Science, specializing in IT Security and Cryptography
  • 2023: Appointed Akademischer Rat auf Lebenszeit (i.e., achieved tenure)
  • 2021: Appointed Akademischer Rat auf Probe (probation period)
  • 2020: Completed my PhD with distinction under supervision of Tibor Jager and with Colin Boyd as second examiner
  • 2019-2021: Research assistant at University of Wuppertal, Germany
  • 2017-2019: Reseach assistant at Paderborn University, Germany
  • 2015-2017: Completed my master's degree in IT Security and Information Engineering at Ruhr University Bochum
  • 2012-2015: Completed my bachelor's degree in IT Security and Information Engineering at Ruhr University Bochum

My research interests lie at the intersection of theoretical and real-world cryptography, where I enjoy analyzing and improving the security of real-world communication protocols. This includes, e.g., the analysis of complex protocols such as the WhatsApp end-to-end encrypted backup protocol, developing efficient protocols with tailored security properties, or investigating if certain security properties are even possible to achieve in practice (and how to potentially evade such impossibility results).

Research Projects

  • 2025-2028: Theoretical Foundations of Real-World Password Authenticated Key Exchange, DFG Research Grant

Honors and Awards

  • 2024: Two of my students won a Barmenia-Förderpreis for outstanding bachelor theses on a topic with a strong mathematical focus
  • GDD-Wissenschaftspreis 2020 for an outstanding PhD thesis in the areas of data protection and data security
  • Deutschlandstipendium 2016, awarded to students with outstanding achievements and social commitment
  • Deutschlandstipendium 2015, awarded to students with outstanding achievements and social commitment

Media Coverage

Independent Teaching Experience

During my time at the University of Wuppertal, I have independently taught the following courses:

  • Grundlagen der IT-Sicherheit (WiSe 2022/23, WiSe 2023/24, WiSe 2024/25)
  • Moderne Kryptographie (SoSe 2022, SoSe 2023, SoSe 2024, SoSe 2025)
  • Effiziente Implementierung kryptographischer Verfahren (WiSe 2020/21, WiSe 2021/22, WiSe 2022/23, WiSe 2024/25)
  • Communication Security for Modern Applications (SoSe 2021)

In addition, I have independently supervised and examined > 15 bachelor's and master's theses. Two of my students have won the Barmenia-Förderpreis for an outstanding bachelor thesis.

Academic Service

I have served as an external reviewer for the following conferences and journals:

  • 2024: EUROCRYPT, CRYPTO
  • 2023: ASIACRYPT, CCS, Designs, Codes and Cryptography, ISC
  • 2022: EUROCRYPT, CRYPTO, ESORICS, IEEE Transactions on Dependable and Secure Computing (TDSC), IEEE Transactions on Mobile Computing (TMC)
  • 2021: IEEE S&P, ESORICS, ITC
  • 2020: Journal of Cryptology, ASIACRYPT, ASIACCS, ISC
  • 2019: CCS, PKC, ASIACCS, ACISP
  • 2018: CCS, ACNS, CT-RSA
  • 2017: PKC, ISC

Peer-Reviewed Publications

2024

2023

2022

2021

2020

2019

Doctoral Dissertation

zuletzt bearbeitet am: 06.05.2025

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