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zeekayandHanzo Dev
638fba4c90
Bylines, paper authorship, correspondence addresses and the founder blurb under each post named an individual. They name the organisation that published the work instead: the brand on posts and pages, the research byline on papers, and research@ in place of a personal address. Both are what these repositories already used elsewhere — nothing new was coined. Co-authors are untouched. Where a paper named someone else alongside, they stay named; only the one byline changed. Bibliography entries, running heads, PDF metadata and affiliations move with it, so a citation still resolves to whoever the cited paper names. Sample and fixture data uses the placeholder name these tests already use elsewhere, so no assertion changed meaning. Co-authored-by: Hanzo Dev <[email protected]>
80 lines
2.7 KiB
Lean4
80 lines
2.7 KiB
Lean4
/-
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Authors: Antje Worring, Zoo Labs Foundation Research
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Revocation Model
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Revocations cancel vouches. A revocation must be cryptographically
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signed by the revoker — otherwise anyone could DoS the trust graph.
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Maps to:
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- hanzo/iam: token revocation lists
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- lux/node: validator key rotation and revocation
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Properties:
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- Revocations are signature-verified
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- Revocation is monotone (adding revocations only removes trust paths)
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- Revoked vouches have no authority
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-/
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import Mathlib.Data.Nat.Defs
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import Mathlib.Data.List.Basic
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import Mathlib.Tactic
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namespace Trust.Revocation
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/-- A revocation record -/
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structure Revocation where
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revoker : Nat -- who is revoking
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revoked : Nat -- whose vouch is being revoked
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timestamp : Nat -- when
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sigValid : Bool -- has the signature been verified?
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/-- A vouch reference (simplified) -/
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structure VouchRef where
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voucher : Nat
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vouchee : Nat
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/-- Check if a vouch is revoked -/
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def isRevoked (revocations : List Revocation) (v : VouchRef) : Bool :=
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revocations.any fun r =>
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r.sigValid && r.revoker == v.voucher && r.revoked == v.vouchee
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/-- Unsigned revocations are ignored -/
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theorem unsigned_revocation_ignored (r : Revocation) (v : VouchRef)
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(h : r.sigValid = false) :
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¬(r.sigValid && r.revoker == v.voucher && r.revoked == v.vouchee) = true := by
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simp [h]
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/-- Adding a revocation can only increase the revoked set (monotone) -/
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theorem revocation_monotone (revocations : List Revocation) (r : Revocation) (v : VouchRef)
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(h : isRevoked revocations v = true) :
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isRevoked (r :: revocations) v = true := by
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simp [isRevoked, List.any_cons] at *
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exact Or.inr h
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/-- Empty revocation list revokes nothing -/
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theorem empty_revokes_nothing (v : VouchRef) :
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isRevoked [] v = false := rfl
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/-- A valid revocation for the exact vouch works -/
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theorem valid_revocation_works (revoker revoked ts : Nat) (v : VouchRef)
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(h_revoker : (revoker == v.voucher) = true)
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(h_revoked : (revoked == v.vouchee) = true) :
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isRevoked [⟨revoker, revoked, ts, true⟩] v = true := by
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simp [isRevoked, List.any_cons, List.any_nil, h_revoker, h_revoked]
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/-- Filter: only valid (signed) revocations matter -/
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def validRevocations (revocations : List Revocation) : List Revocation :=
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revocations.filter (·.sigValid)
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/-- Filtering preserves revocation status -/
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theorem valid_filter_preserves (revocations : List Revocation) (v : VouchRef)
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(h : isRevoked revocations v = true) :
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isRevoked (validRevocations revocations) v = true := by
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simp only [isRevoked, validRevocations, List.any_eq_true, List.mem_filter,
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Bool.and_eq_true] at *
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obtain ⟨r, hr_mem, hr_match⟩ := h
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exact ⟨r, ⟨hr_mem, hr_match.1.1⟩, hr_match⟩
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end Trust.Revocation
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