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Faster SeaSign signatures through improved rejection sampling

Boekbijdrage - Boekhoofdstuk Conferentiebijdrage

We speed up the isogeny-based “SeaSign” signature scheme recently proposed by De Feo and Galbraith. The core idea in SeaSign is to apply the “Fiat–Shamir with aborts” transform to the parallel repeated execution of an identification scheme based on CSIDH. We optimize this general transform by allowing the prover to not answer a limited number of said parallel executions, thereby lowering the overall probability of rejection. The performance improvement ranges between factors of approximately 4.4 and 65.7 for various instantiations of the scheme, at the expense of roughly doubling the signature sizes.
Boek: Post-Quantum Cryptography. PQCrypto 2019. Lecture Notes in Computer Science, vol 11505
Pagina's: 271 - 285
Aantal pagina's: 15
ISBN:978-3-030-25509-1
Jaar van publicatie:2019
BOF-keylabel:ja
IOF-keylabel:ja
Authors from:Higher Education
Toegankelijkheid:Open