Appears in collection : 2024 - T3 - WS2 - Emerging topics in design and cryptanalysis of post-quantum schemes

The 2022 attack on the SIDH cryptosystem changed the landscape of isogeny-based cryptography, not only destructively, but also by providing powerful new constructive tools. In this talk, we present SQIsignHD, a post-quantum digital signature scheme similar to SQISign. Exploiting the new machinery, SQIsignHD overcomes the main drawbacks of SQISign, improving its scalability, signing efficiency, and the security proof.