Prof. Dr. Anja Lehmann

Cavit Özbay

PhD Student

Room: H-1.10

Phone: +49 331 5509-4863

E-Mail: Cavit.Oezbay(at)hpi.de


I am studying for my PhD degree in HPI since September 2022. I completed my MSc degree in Sabanci University, Computer Science and Engineering in 2022. I had BSc in 2020 from Istanbul Technical University, Computer Engineering. My main research interests include privacy enhancing protocols and my current research is mainly shaped around:

  • Privacy-preserving authentication
  • Multi-party signatures 
  • Privacy properties of signatures


  • Multi-Signatures for Ad-h... - Download
    Lehmann, A., Özbay, C.: Multi-Signatures for Ad-hoc and Privacy-Preserving Group Signing. Preprint. (2023).


  • 1.
    Ozbay, C., Levi, A.: Blacklisting Based Anonymous Authentication Scheme for Sharing Economy. IEEE Transactions on Dependable and Secure Computing. 1–18 (2023).