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zeekay
abf99d05fc
Restructured from flat .tex/.pdf files into per-paper subdirectories. Added Antje Worring as co-author on all papers. Synced PDFs to pdfs/ for download site.
28 lines
838 B
TeX
28 lines
838 B
TeX
\section{Pseudorandom Function for Stability}
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\label{sec:prf}
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FPC uses a cryptographic PRF to ensure deterministic thresholds:
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\begin{lstlisting}[language=Go, caption=PRF-based threshold stability]
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func deterministicThreshold(round int, seed []byte) float64 {
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input := append(seed, uint64ToBytes(round)...)
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hash := blake3.Sum256(input)
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// Map hash to [0, 1]
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val := binary.BigEndian.Uint64(hash[:8])
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normalized := float64(val) / float64(^uint64(0))
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// Scale to [thetaMin, thetaMax]
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return thetaMin + (thetaMax-thetaMin)*normalized
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}
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\end{lstlisting}
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This provides:
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\begin{itemize}
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\item \textbf{Determinism}: Same threshold for given round across honest nodes
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\item \textbf{Testability}: Reproducible simulations
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\item \textbf{Security}: Prevents adversarial threshold manipulation
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\end{itemize}
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