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32 lines
1.6 KiB
TeX
32 lines
1.6 KiB
TeX
\section{The Invariant: Machine-Checkable Security Claims}
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\label{sec:invariant}
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\begin{invariant}[Machine-checkable security]
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Every security property of the Lux Network either:
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\begin{enumerate}[leftmargin=2em]
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\item Has a machine-checkable proof (formal verification in Coq, Lean, or TLA+), or
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\item Has an automated test suite that verifies the property against known test
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vectors, or
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\item Is explicitly listed as an unverified assumption with a justification for
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why it is believed to hold.
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\end{enumerate}
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There is no fourth category. ``We believe it is secure'' without one of the above
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annotations is not a valid security claim.
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\end{invariant}
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This invariant is not aspirational---it is a \emph{process requirement}. Every
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protocol change must be accompanied by an update to one of the three categories.
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New cryptographic primitives require either a proof reference or NIST KAT validation.
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New consensus rules require either a formal proof or a TLA+ model. New implementations
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require either formal verification or an automated test suite with coverage metrics.
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The purpose of this invariant is not to achieve 100\% formal verification (which is
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impractical for a large system). The purpose is to eliminate the category of
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``security claims that nobody has checked.'' Every claim is checked by a machine, a
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proof system, or a test suite---or it is explicitly marked as unchecked.
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%% ========================================================================
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%% 10. RELATED WORK
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%% ========================================================================
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