Jan Bobolz

I’m a PhD student at Paderborn University, part of Prof. Blömer’s research group.

I am interested in (privacy-preserving) cryptography. Today, we regularly reveal private data that seems to be necessary for operation of a service, but really isn’t.

For example, we scan our customer loyalty card when grocery shopping, which uniquely identifies us. While this seems necessary (how else are they going to know which database entry to increment), with cryptography, we can remove the central database from the picture completely and instead let every user store their own (authenticated) point count on their phone.

Ideally, we’ll end up living in a world without huge databases containing your personal data. Instead you control your data and only disclose carefully chosen statements about it.

Research interests

I’m most at home in the discrete logarithm world (though I’m trying to branch out into some lattice stuff, too). Currently, I’m interested in:

  • Anonymous credentials
  • Privacy-preserving loyalty systems
  • Zero-knowledge proofs


I’m involved in these projects:

  • 🦎 Cryptimeleon, a Java library for prototyping privacy-preserving crypto.
  • 🪰 SFB 901 (On-the-fly computing)
    • Subproject C1: working on (anonymous) authentication
    • Transfer project T2: bringing privacy-preserving incentive systems closer to practice
  • 👨🏻‍🏫 Teaching