Sietse Ringers, PhD

• Architect and lead developer of the IRMA project at SIDN
• Interested in privacy enhancing technologies, cryptography, and in particular secure and privacy-friendly identity management
• Obtained PhD in 2016 on privacy-friendly identity management and the mathematical side of gauge theories and partial differential equations

The IRMA project

The IRMA project is a privacy-friendly, secure and easy-to-use authentication mechanism, using the Idemix attribute-based credential scheme as underlying credential scheme. As the lead programmer of IRMA I develop and maintain the core software: the IRMA server that can verify and issue attributes, the IRMA iOS/Android app core, and the protocols they use (source, documentation).

Attribute-based credentials

With an attribute-based credential scheme, you can selectively show some of your properties, while keeping others to yourself (more detailed explanation here). Idemix is an example of such a scheme; it is used in the IRMA project. Jaap-Henk Hoepman, Eric Verheul and myself have created a new, smart-card suitable attribute-based credential scheme.

PhD thesis

My PhD thesis Quantization using Jet Space Geometry and Identity Management using Credential Schemes, which I defended on 7 October 2016 at the University of Groningen, may be found here. I have many hardcopies left; if you would like one, feel free to contact me.

Publications

• S. Ringers, E. Verheul, and J.-H. Hoepman. An efficient self-blindable attribute-based credential scheme. In Financial Cryptography 2017 (FC’17). PDF, slides
• E. Verheul, S. Ringers, and J.-H. Hoepman. The self-blindable U-Prove scheme from FC’14 is forgeable. In Financial Cryptography 2016 (FC’16). PDF, slides
• S. Ringers, J.-H. Hoepman, and W. Lueks. On linkability and malleability in self-blindable credentials. In The 9th WISTP International Conference on Information Security Theory and Practice (WISTP’2015), Heraklion, Crete, Greece, August 24-25 2015. PDF

Earlier publications

• A. V. Kiselev and S. Ringers. A comparison of definitions for the Schouten bracket on jet spaces. In Proceedings of Sixth International Workshop “Group Analysis of Differential Equations and Integrable Systems”, Larnaca, Cyprus, 2012. arXiv: 1208.6196.
• S. Ringers, Topologically Twisted Yang-Mills Theory on K3 Surfaces. MSc thesis, supervised by prof. R. Dijkgraaf. PDF.

Contact

• sietse.ringers at sidn.nl
• mail at sietseringers.net
• PGP: 1454E9DA/639A 6D6A D9B0 B99A E2B9 D43C 13DA 013A 1454 E9DA