My time at RUB is coming to an end and I'm looking for an industry position. Primarily looking for remote or Rhine-Ruhr area positions, but will consider any exceptional offers. So if you're looking to hire a cryptographer to work on cryptographic protocols, or related areas, maybe we should talk!

I'm looking for a PhD student to work with me on formal verification for cryptographic protocols. This is a 4-year position at VU Amsterdam, co-supervised with Kristina Sojakova. Send me an email if you want to know more!

Consider attending our CASA summer school on cryptography and distributed computing from June 22.-25. in Bochum! Registration is open until March 12. casa.rub.de/en/events/ca...

I am very excited that our work on secure cloud storage is now online. A big shoutout also to my co-author @jonasjanneck.bsky.social who will present the results at Eurocrypt’26!

We updated our work on the first concrete security proof of the Falcon signature scheme 🦅 ia.cr/2024/1769 This is joint work with Pierre-Alain, Phillip, Hubert, and @kiltz.bsky.social and will appear at Eurocrypt’26 🎉

Happy to announce that Bird of Prey is accepted at EC’26 🛸✍️🎉 eprint.iacr.org/2025/1844 The paper presents three signature combiners for PQC migration preserving strong unforgeability. They capture all broadly used classical schemes and can be used with *any* PQ signature in a black-box way!

I am co-organising (with @drl3c7er.bsky.social and Lucjan Hanzlik) a workshop on Privacy-Enhancing Cryptography in Rome on May 10 as an affiliated event to IACR Eurocrypt. Submit your best PEC-work (3-page extended abstract) for presentation by February 25th: privcryptworkshop.github.io

Planning your trip to Eurocrypt or looking for an excuse to still go? The reviewers did not appreciate your too involved or too elegant proofs? Consider submitting a talk to ProTeCS (protecs-workshop.gitlab.io), an affiliated event of EC, where we celebrate proofs as independent objects of study!

Are you looking for a signature combiner for PQC migration? We already have combiners/hybrids for unforgeability. But do we have combiners that also preserve strong unforgeability and all BUFF properties? Now we do:

Snake Mackerel: An Isogeny-Based AKEM Leveraging Randomness Reuse (Jonas Janneck, Jonas Meers, Massimo Ostuzzi, Doreen Riepel) ia.cr/2025/1474

The preliminary program for the Cryptographic Applications Workshop (CAW) at Eurocrypt'25 is out. #CAW focuses on the construction and analysis of cryptography built for practice. This thread gives a quick overview; the full program and abstracts are here: caw.cryptanalysis.fun#program

The 3rd edition of WISC – Women in Security and Cryptography Workshop will take place in Bochum from June 16 to 18. Already confirmed are talks by Lejla Batina, Zinaida Benenson, Shafi Goldwasser, Martina Lindorfer, and Doreen Riepel. Registration is open now! casa.rub.de/en/events/wi...