Sina Schaeffler

PhD student in cryptography at ETH Zurich and IBM Research. Supervised by Luca De Feo and Kenneth Paterson.

Research papers

• Qlapoti: Simple and Efficient Translation of Quaternion Ideals to Isogenies
  Giacomo Borin, Maria Corte-Real Santos, Jonathan Komada Eriksen, Riccardo Invernizzi, Marzio Mula, Sina Schaeffler, and Frederik Vercauteren. ASIACRYPT 2025. 2025.
  eprint code
• Constant time lattice reduction in dimension 4 with application to SQIsign
  Otto Hanyecz, Alexander Karenin, Elena Kirshanova, Péter Kutas, and Sina Schaeffler. TCHES 2025. 2025.
  eprint code
• Towards Leakage-Resilient Ratcheted Key Exchange
  Daniel Collins, Simone Colombo, and Sina Schaeffler. PKC 2025. 2025.
  eprint

Technical documents

• SQIsign Algorithm specifications and supporting documentation Version 2.0
  Marius A. Aardal, Gora Adj, Diego F. Aranha, Andrea Basso, Isaac Andrés Canales Martínez, Jorge Chávez-Saab, Maria Corte-Real Santos, Pierrick Dartois, Luca De Feo, Max Duparc, Jonathan Komada Eriksen, Tako Boris Fouotsa, Décio Luiz Gazzoni Filho, Basil Hess, David Kohel, Antonin Leroux, Patrick Longa, Luciano Maino, Michael Meyer, Kohei Nakagawa, Hiroshi Onuki, Lorenz Panny, Sikhar Patranabis, Christophe Petit, Giacomo Pope, Krijn Reijnders, Damien Robert, Francisco Rodríguez Henríquez, Sina Schaeffler, and Benjamin Wesolowski. 2025.
  document website code
• SQIsign Algorithm specifications and supporting documentation Version 1.0
  Jorge Chavez-Saab, Maria Corte-Real Santos, Luca De Feo, Jonathan Komada Eriksen, Basil Hess, David Kohel, Antonin Leroux, Patrick Longa, Michael Meyer, Lorenz Panny, Sikhar Patranabis, Christophe Petit, Francisco Rodríguez Henríquez, Sina Schaeffler, and Benjamin Wesolowski. 2023.
  document website code

Master Thesis

• Algorithms for Quaternion Algebras in SQIsign
  Sina Schaeffler. Master Thesis at ETH Zurich, supervised by Luca De Feo and Kenneth Paterson. 2023.
  pdf