New Parameter Sets for SPHINCS+

Jinwoo LEE  Tae Gu KANG  Kookrae CHO  Dae Hyun YUM  

IEICE TRANSACTIONS on Information and Systems   Vol.E104-D   No.6   pp.890-892
Publication Date: 2021/06/01
Publicized: 2021/03/02
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019EDL8223
Type of Manuscript: LETTER
Category: Information Network
post-quantum cryptography,  hash based signatures,  SPHINCS,  SPHINCS+,  parameters,  

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SPHINCS+ is a state-of-the-art post-quantum hash-based signature that is a candidate for the NIST post-quantum cryptography standard. For a target bit security, SPHINCS+ supports many different tradeoffs between the signature size and the signing speed. SPHINCS+ provides 6 parameter sets: 3 parameter sets for size optimization and 3 parameter sets for speed optimization. We propose new parameter sets with better performance. Specifically, SPHINCS+ implementations with our parameter sets are up to 26.5% faster with slightly shorter signature sizes.