Table 4 shows how sphincs+ compares to rsa and ecdsa for a 128-bit security level in terms of public key size, signature size, and veri cation speed on opentitan. Sphincs+-128s รขโ‚ฌ 64-byte private key, 32-byte public key, ~ 8kb signature, instant key generation, slow signing speed ~ few secs, instant verification, 133-bit security level Sphincs features a larger 1kb public and private key size and a 41kb signature size.

Sphincs+ 256 128-bit has a public key size of 32 bytes, a private key size of 64 bytes, and a signature of 17kb. It has been shown to operate at speeds of hundreds of hashes per second on a 4-core รขโ‚ฌยฆ Sphincs+-128s รขโ‚ฌ 64-byte private key, 32-byte public key, ~ 8kb signature, instant key generation, slow signing speed ~ few secs, instant verification, 133-bit security level