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SPHINCS is a stateless hash-based signature scheme, which is quantum robust. It was proposed by Bernstein et al. in 2015 [paper]. SPHINCS+ 256 has a public key size of 1kB, a private key size of 1kB, and a signature of 41 kB. It has been shown to operate at speeds of hundreds of hashes per second on a 4-core 3.5GHz processor.