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29 lines
1.2 KiB
TeX
29 lines
1.2 KiB
TeX
\section{SLH-DSA: Hash-Based Signatures (FIPS 205)}
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\subsection{Construction}
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\SLHDSA{} (formerly SPHINCS+) is a stateless hash-based scheme whose security reduces solely to hash function second-preimage resistance---no lattice or number-theoretic assumptions. Zoo deploys \SLHDSA{}-SHA2-192s.
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The scheme uses a hypertree of $d = 7$ XMSS trees of height $h/d$ ($h = 63$ total), with FORS few-time signatures at the leaves. This provides $2^{63}$ signing capacity per key pair with the most conservative security margin of any post-quantum scheme.
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\subsection{Performance and Usage}
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\begin{table}[h]
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\centering
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\begin{tabular}{lcc}
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\toprule
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\textbf{Parameter} & \textbf{SLH-DSA-SHA2-192s} & \textbf{ML-DSA-65} \\
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\midrule
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Public key / Secret key & 48\,B / 96\,B & 1,952\,B / 4,032\,B \\
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Signature & 16,224\,B & 3,309\,B \\
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Sign / Verify & 280\,ms / 6.2\,ms & 0.68\,ms / 0.25\,ms \\
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\bottomrule
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\end{tabular}
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\caption{\SLHDSA{}: compact keys, large signatures, slow operations}
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\label{tab:slhdsa-perf}
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\end{table}
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Reserved for high-assurance, low-frequency operations: root CA key certification, DAO constitutional amendments, long-term validator identity binding, cross-chain bridge anchors.
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