Multi-Armed SPHINCS+

Published in In *ACNS-SCI 2023*, 2023

SPHINCS+ is a quantum-resistant, stateless hash-based signature scheme standardized by NIST. Despite its strong security guarantees, it suffers from:

  • Large signature sizes
  • Slow signing processes

This paper focuses on mitigating the signing latency by leveraging:

  • The multi-core Snapdragon 865 Mobile Platform
  • Vector extensions for parallel processing

Key results:

  • Achieves up to 15× speed-up over non-vectorized implementations
  • Demonstrates side-channel protected versions using vectorized SHAKE-based SPHINCS+
  • Suggests hash-based signatures are viable even on constrained mobile devices with proper parallelization

This work bridges secure PQ signatures and efficient mobile deployment.

Recommended citation: Gustavo Banegas, Florian Caullery. (2023). "Multi-Armed SPHINCS+." In ACNS-SCI 2023.
Download Paper | Download Slides | Download Bibtex