SPHINCS$^+$ post-quantum digital signature scheme with Streebog hash function
This work addresses the problem of quantum-resistant cryptography for secure communications, but it is incremental as it focuses on a specific hash function substitution.
The paper tackles the need for post-quantum digital signatures by analyzing the use of the Streebog hash function in the SPHINCS$^+$ scheme, providing performance comparisons and benchmarks against SHA-256-based implementations.
Many commonly used public key cryptosystems will become insecure once a scalable quantum computer is built. New cryptographic schemes that can guarantee protection against attacks with quantum computers, so-called post-quantum algorithms, have emerged in recent decades. One of the most promising candidates for a post-quantum signature scheme is SPHINCS$^+$, which is based on cryptographic hash functions. In this contribution, we analyze the use of the new Russian standardized hash function, known as Streebog, for the implementation of the SPHINCS$^+$ signature scheme. We provide a performance comparison with SHA-256-based instantiation and give benchmarks for various sets of parameters.