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Title:
Optimization for SPHINCS+ using Intel Secure Hash Algorithm Extensions
Authors: Thomas Hanson, Qian Wang, Santosh Ghosh, Fernando Virdia, Anne Reinders, Manoj R. Sastry
Abstract:SPHINCS+ was selected as a candidate digital signature scheme for standardization by the NIST Post-Quantum Cryptography Standardization Process. It offers security capabilities relying only on the security of cryptographic hash functions. However, it is less efficient than the lattice-based schemes. In this paper, we present an optimized software library for the SPHINCS+ signature scheme, which combines the Intel® Secure Hash Algorithm Extensions (SHA-NI) and AVX2 vector instructions. We obtain significant speed-up of SPHINCS±128f-simple on both non-optimized (70%) and AVX2 reference implementations (8% -23%) offering 128-bit security.
ePrint: https://eprint.iacr.org/2022/1726
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