OIST Visiting Program

2 February 2026

From January 13th to January 26th Sebastian Spindler participated in the first two weeks of the OIST Thematic Program “Isogeny-based Cryptography” in Onna (Okinawa, Japan). The mornings started off with many interesting research talks, and afterwards the participants formed smaller groups to brainstorm on various topics in the current landscape of isogeny-based cryptography; during the first week these brainstorm sessions focused on the more theoretical mathematical foundations of the field, while the second week shifted the focus to cryptanalysis of current schemes and reductions between different security assumptions.
As part of the morning presentations, Sebastian also gave his talk “The recent history of l^•-isogeny proofs of knowledge”, in which he surveyed the recent developments of proofs of knowledge for isogeny paths. These developments mainly include the QuSAC Lab’s CRYPTO paper “More Efficient Isogeny Proofs of Knowledge via Canonical Modular Polynomials” and its soon to be published follow-up “On the Use of Atkin and Weber Modular Polynomials in Isogeny Proofs of Knowledge” as well as the Asiacrypt paper “Faster Proofs and VRFs from Isogenies” written by QuSAC collaborators Robi Pedersen and Shai Levin.

Picture: 52401374224_a025aa9169_k.jpg (1920×1080) (oist.jp)

Aktuelles

Asiacrypt 2025

From the 8th until the 12th of December, members of the QuSAC group visited Asiacrypt, the largest cryptography conference of Asia. The 2025 edition took place in Melbourne, Australia. It was a valuable opportunity to speak with other researches and learn about recent research. In total, 3 papers accepted at the conference were (co-)authored by members of the QuSAC group.

Swissogeny Day Lausanne

On November 26th Shernyce Duncombe, Marzio Mula and Sebastian Spindler participated in the fourth edition of the Swissogeny Day, which was hosted at the EPFL in Lausanne. The one-day workshop kicked off with research talks on generalized lollipop attacks, an alternative approach to SQIsign incorporating level structures, and an attack on the active security of PEARL-SCALLOP.

Research Visit and Seminar Talks @ INRIA Bordeaux

In November 2025, two researchers from the QuSAC lab, Marzio Mula and Sebastian Spindler, visited the CANARI project-team at Inria Bordeaux and the Institut de Mathématiques de Bordeaux. During their stay, they gave two seminar talks at the Algorithmic Number Theory Seminar (Séminaire de Théorie Algorithmique des Nombres).

Invited Speaker at the Australian Summer School on Privacy 2025

Prof. Daniel Slamanig was an invited speaker at the Australian Summer School on Privacy 2025, held at the University of New South Wales (UNSW) in Sydney. The summer school brought together students, researchers, and practitioners from academia and industry to explore current developments in privacy-enhancing technologies, including topics such as cryptography for privacy, differential privacy, usable privacy, and AI privacy.

Talk @ Crypto 2025

On August 18th, Sebastian Spindler presented the paper “More Efficient Isogeny Proofs of Knowledge via Canonical Modular Polynomials”, which arose from a collaboration between the QuSAC group and CODE colleague Sören Kleine, remotely during the 45th edition of the CRYPTO conference.

Isogeny Club

On October 7th, Sebastian Spindler gave the online talk “Counting ℓ-isogenies with different modular polynomials” as part of the seventh season of the Isogeny Club. The talk covered both the CRYPTO paper “More Efficient Isogeny Proofs of Knowledge via Canonical Modular Polynomials”, which is a joint work of the QuSAC group and CODE colleague Sören Kleine, as well as subsequent, not yet published follow-up work that investigates other modular polynomials.