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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.
64 lines
2.5 KiB
TeX
64 lines
2.5 KiB
TeX
\section{Conclusion}
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Validators should not hold full signing keys. The single-key architecture is a
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design flaw inherited from a time when blockchain validators were assumed to be
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well-secured dedicated machines. Modern validator infrastructure---running on
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cloud VMs, managed by organizations with varying security postures, targeted by
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sophisticated adversaries---requires defense in depth.
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Threshold cryptography provides this defense at acceptable cost: 2--19\,ms signing
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latency, zero on-chain overhead (signatures are standard format), and a resharing
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protocol that handles validator set changes without key reconstruction. The
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implementation is deployed in production on the Lux network.
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%% ========================================================================
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%% BIBLIOGRAPHY
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%% ========================================================================
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\begin{thebibliography}{20}
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\bibitem{canetti2021uc}
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R. Canetti, R. Gennaro, S. Goldfeder, N. Makriyannis, and U. Peled, ``UC
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Non-Interactive, Proactive, Threshold ECDSA with Identifiable Aborts,''
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\emph{ACM CCS 2020}, pp.~1769--1787, 2020.
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\bibitem{komlo2020frost}
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C.~Komlo and I.~Goldberg, ``FROST: Flexible Round-Optimized Schnorr Threshold
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Signatures,'' \emph{SAC 2020}, pp.~34--65, Springer, 2020.
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\bibitem{pedersen1991threshold}
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T.~P. Pedersen, ``A Threshold Cryptosystem without a Trusted Party,''
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\emph{EUROCRYPT '91}, pp.~522--526, Springer, 1991.
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\bibitem{feldman1987practical}
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P.~Feldman, ``A Practical Scheme for Non-Interactive Verifiable Secret Sharing,''
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\emph{FOCS '87}, pp.~427--437, IEEE, 1987.
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\bibitem{gennaro2020fast}
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R.~Gennaro and S.~Goldfeder, ``One Round Threshold ECDSA with Identifiable Abort,''
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IACR ePrint 2020/540, 2020.
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\bibitem{boldyreva2003threshold}
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A.~Boldyreva, ``Threshold Signatures, Multisignatures and Blind Signatures Based on
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the Gap-Diffie-Hellman-Group Signature Scheme,'' \emph{PKC 2003}, pp.~31--46,
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Springer, 2003.
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\bibitem{groth2021non}
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J.~Groth, ``Non-Interactive Distributed Key Generation and Key Resharing,''
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IACR ePrint 2021/339, 2021.
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\bibitem{shamir1979share}
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A.~Shamir, ``How to Share a Secret,'' \emph{Communications of the ACM}, vol.~22,
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no.~11, pp.~612--613, 1979.
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\bibitem{desmedt1989threshold}
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Y.~Desmedt, ``Threshold Cryptosystems,'' \emph{AUSCRYPT '89}, pp.~3--14,
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Springer, 1990.
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\bibitem{boneh2001bls}
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D. Boneh, B. Lynn, and H. Shacham, ``Short Signatures from the Weil Pairing,''
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\emph{Journal of Cryptology}, vol.~17, no.~4, pp.~297--319, 2004.
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\end{thebibliography}
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