Faulting Winternitz One-Time Signatures to forge LMS, XMSS, or SPHINCS+ signatures

ePrint Report: Faulting Winternitz One-Time Signatures to forge LMS, XMSS, or SPHINCS+ signatures

Alexander Wagner, Vera Wesselkamp, Felix Oberhansl, Marc Schink, Emanuele Strieder

Hash-based signature (HBS) schemes are an efficient method of guaranteeing the authenticity of data in a post-quantum world. The stateful schemes LMS and XMSS and the stateless scheme SPHINCS+ are already standardised or will be in the near future. The Winternitz one-time signature (WOTS) scheme is one of the fundamental building blocks used in all these HBS …

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