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This project implements the stateless hash-based signature scheme SPHINCS-256 for anArduino Due board. The scheme provides an effective replacement for digital signature in a post-quantum world. It combines the extended Merkle's signature scheme (XMSS), improved Winternitz one-time signatures (WOTS+), and "Hash to Obtain Random Subset" Trees (HORST) few-time signatures scheme.

The goal of this project is to to reproduce the implementation ofSPHINCS-256 on an STM32L100XC ARM Cortex-M3 but for a SAM3X8E ARM Cortex-M3 CPU using the Atmel Studio framework (ASF) such that environmental attacks, like side-channel analysis or fault injection, can be performed.

See the official website:https://sphincs.cr.yp.to/.

The project was intended to work with the following software :

• An Atmel SAM3X8E ARM Cortex-M3 board (Arduino Due)
• Arduino IDE 1.8.1
• Atmel Studio 7.0
• Program Arduino Due with Atmel Studio 7

• Daniel J. Bernstein et al. "SPHINCS: practical stateless hash-based signatures". In:IACR Cryptology ePrint Archive 2014 (2014), p. 795. url:http://eprint.iacr.org/2014/795.
• Andreas Hülsing, Joost Rijneveld, and Peter Schwabe. "ARMed SPHINCS - Computing a 41KB signature in 16KB of RAM". In:IACR Cryptology ePrint Archive 2015 (2015), p. 1042. url:http://eprint.iacr.org/2015/1042.
• Joost Rijneveld. "SPHINCS-py". GitHub repository.https://github.com/joostrijneveld/SPHINCS-py

Author : Aymeric Genetaymeric {dot} genet {at} epfl {dot} ch