SPHINCS-256 is a high-security post-quantum stateless hash-based signature scheme that signs hundreds of messages per second on a modern 4-core 3.5GHz Intel CPU. Signatures are 41 KB, public keys are 1 KB, and private keys are 1 KB. SPHINCS-256 is designed to provide long-term 2128 security even against attackers equipped with quantum computers. Unlike most hash-based signature schemes, SPHINCS-256 is stateless, allowing it to be a drop-in replacement for current signature schemes.
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