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zeekayandHanzo Dev
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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]>
108 lines
3.7 KiB
Lean4
108 lines
3.7 KiB
Lean4
/-
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Authors: Antje Worring, Zoo Labs Foundation Research
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Vouch-Based Trust Model
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No CA. No global root. Trust flows through attestation chains.
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Each vouch bounds the scope of delegated authority.
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Maps to:
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- hanzo/iam: attestation chains
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- lux/node: validator vouch graph
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- zoo/contracts: role endorsements
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Properties:
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- Chain authority is monotonically decreasing
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- Unrecognized keys have no authority
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- Vouch signatures bind ALL security-relevant fields
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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.Vouch
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/-- Recognition level: how much we trust this key -/
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inductive RecognitionLevel where
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| unrecognized -- No trust path
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| vouched -- Vouched by someone trusted
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| direct -- Directly trusted (root)
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deriving DecidableEq, Repr
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def RecognitionLevel.rank : RecognitionLevel → Nat
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| .unrecognized => 0
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| .vouched => 1
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| .direct => 2
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/-- Unrecognized is minimum recognition -/
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theorem unrecognized_min (r : RecognitionLevel) :
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RecognitionLevel.rank .unrecognized ≤ RecognitionLevel.rank r := by
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cases r <;> simp [RecognitionLevel.rank]
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/-- A vouch: one key vouches for another with bounded scope.
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The signature MUST bind all fields to prevent replay attacks. -/
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structure Vouch where
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voucher : Nat -- voucher's public key (abstract)
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vouchee : Nat -- who is being vouched for
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scope : Nat -- authority bound (abstract)
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expires : Nat -- expiry timestamp
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/-- Vouch chain authority: foldl min over scope values.
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Authority can only NARROW through delegation. -/
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def chainAuthority (chain : List Vouch) (top : Nat) : Nat :=
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chain.foldl (fun acc v => min acc v.scope) top
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/-- foldl-min over scopes is monotone in the starting accumulator -/
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theorem foldl_min_mono (chain : List Vouch) (a b : Nat) (h : a ≤ b) :
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chain.foldl (fun acc v => min acc v.scope) a
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≤ chain.foldl (fun acc v => min acc v.scope) b := by
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induction chain generalizing a b with
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| nil => simpa using h
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| cons hd tl ih =>
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simp only [List.foldl_cons]
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exact ih (min a hd.scope) (min b hd.scope) (by omega)
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/-- Adding a vouch can only reduce authority -/
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theorem chain_authority_monotone (chain : List Vouch) (v : Vouch) (top : Nat) :
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chainAuthority (v :: chain) top ≤ chainAuthority chain top := by
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simp only [chainAuthority, List.foldl_cons]
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exact foldl_min_mono chain (min top v.scope) top (Nat.min_le_left top v.scope)
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/-- Empty chain gives full authority -/
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theorem empty_chain_full (top : Nat) :
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chainAuthority [] top = top := by
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simp [chainAuthority]
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/-- Chain authority is bounded by top -/
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theorem chain_bounded (chain : List Vouch) (top : Nat) :
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chainAuthority chain top ≤ top := by
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induction chain generalizing top with
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| nil => simp [chainAuthority]
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| cons hd tl ih =>
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simp [chainAuthority, List.foldl_cons]
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calc chainAuthority tl (min top hd.scope)
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≤ min top hd.scope := ih (min top hd.scope)
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_ ≤ top := Nat.min_le_left top hd.scope
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/-- Chain authority is bounded by every vouch's scope -/
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theorem chain_bounded_by_scope (chain : List Vouch) (top : Nat) (v : Vouch)
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(hv : v ∈ chain) :
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chainAuthority chain top ≤ v.scope := by
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induction chain generalizing top with
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| nil => exact absurd hv (List.not_mem_nil _)
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| cons hd tl ih =>
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rw [List.mem_cons] at hv
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cases hv with
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| inl h =>
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subst h
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simp only [chainAuthority, List.foldl_cons]
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calc chainAuthority tl (min top v.scope)
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≤ min top v.scope := chain_bounded tl _
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_ ≤ v.scope := Nat.min_le_right top v.scope
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| inr h =>
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simp only [chainAuthority, List.foldl_cons]
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exact ih (min top hd.scope) h
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end Trust.Vouch
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