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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.
33 lines
1.2 KiB
TeX
33 lines
1.2 KiB
TeX
\section{Multi-Party Encrypted Workflows}
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The FHE+MPC hybrid generalizes beyond orderbook matching to any multi-party encrypted workflow.
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\subsection{Pattern}
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\begin{enumerate}[leftmargin=2em]
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\item $N$ parties encrypt their private data under a shared FHE public key.
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\item A function $f(x_1, \ldots, x_N)$ is evaluated homomorphically on the encrypted inputs.
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\item The result $\text{FHE.Eval}(f, \text{ct}_1, \ldots, \text{ct}_N)$ is submitted to the MPC committee.
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\item The MPC committee performs threshold decryption and returns the plaintext result with an attestation.
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\end{enumerate}
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No party ever sees another party's private input. The MPC committee never sees any input---only the encrypted result of the computation.
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\subsection{Applications}
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\begin{center}
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\begin{tabular}{lll}
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\toprule
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\textbf{Application} & \textbf{Private Inputs} & \textbf{Decrypted Output} \\
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\midrule
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Private orderbook & Orders (side, price, qty) & Matched trades only \\
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Sealed-bid auction & Bids & Winning bid + winner \\
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Private voting & Votes & Tally only \\
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Credit scoring & Financial data & Score (not data) \\
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Supply chain pricing & Unit costs & Total cost (not components) \\
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\bottomrule
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\end{tabular}
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\end{center}
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