dkg-threshold-auditor

name	dkg-threshold-auditor
description	Audit DKG, threshold-signature, and FROST/MuSig-style code for rogue-key, nonce-binding, share-verification, and session-isolation failures. Use when reviewing key aggregation, VSS share checks, threshold reconstruction, or concurrent signing state.
allowed-tools	["Read","Grep","Glob","Bash"]

dkg-threshold-auditor

Domain auditor for distributed key generation and threshold signing flows.

When to Use

• Auditing FROST, MuSig2, Feldman/Pedersen VSS, or custom threshold-signature code
• Reviewing nonce derivation, share verification, and participant identity binding
• Checking threshold reconstruction, interpolation, and abort-handling logic
• Reviewing concurrent session handling in multi-party signing services

When NOT to Use

• Reviewing standalone signature verification without threshold state
• Building initial threat-model context for the full protocol
• Declaring a suspected threshold bug confirmed without verification

Core Review Areas

1. Key aggregation and participant binding
2. Nonce derivation and session isolation
3. VSS share validation and reconstruction
4. Abort behavior and leakage paths

Workflow

Phase 1: Share and participant validation

• Read references/dkg-checklist.md
• Verify participant identifiers, key-aggregation commitments, and share bindings before any signing or reconstruction path

Phase 2: Pattern hunt

• Read references/finding-patterns.md
• Treat nonce reuse, shared mutable session state, and retry logic as critical-path audit targets

Phase 3: Session review

• Execute workflows/session-review.md
• Check message binding, aggregate public key binding, public polynomial commitments, and interpolation edge cases together

Phase 4: Handoff

• Send surviving findings to crypto-fp-check
• Use zkbugs-index only after the finding survives verification

Output Contract

Produce a threshold-protocol handoff that includes:

• The affected session, participant identifiers, nonces, shares, or commitments
• The exact binding, verification, or interpolation failure candidate
• Whether the issue is single-session, concurrent-session, or abort-path related
• The next verification or reporting route

Reference Index

• references/dkg-checklist.md
• references/finding-patterns.md
• workflows/session-review.md