The Mechanism · Gated-generation receipt

gen-in-3-4-sentences-explain-an-hmac-state-any-key-formula-bf6d

stable pending witness
2026-05-29 05:27:38 UTC · anthropic/claude-sonnet-4-5

Prompt

In 3-4 sentences, explain an HMAC. State any key formula.
57 chars

Generation

An HMAC (Hash-based Message Authentication Code) is a cryptographic authentication technique that combines a secret key with a message and a hash function to verify both data integrity and authenticity. It protects against tampering by ensuring that only parties with the shared secret key can generate valid authentication codes. The key formula is: **HMAC(K, m) = H((K' ⊕ opad) || H((K' ⊕ ipad) || m))** where K' is the key (padded to block size), m is the message, H is the hash function, opad and ipad are outer and inner padding constants, ⊕ is XOR, and || denotes concatenation.
26 tokens in · 163 tokens out · 3938 ms · $0.0025

The four gates

RED
pass
no disqualifying input patterns detected
FLOOR
pass
output above protective minimum; no mismatches
WAY
pass
no declared way_path (Way check NA); no coercion language
EXECUTION
deferred
no witnesses available (Witness Roll not yet constituted)

Verifier results

scripture_anchors NOT_APPLICABLE
0 Scripture citation(s) extracted
theology_doctrine NOT_APPLICABLE
no doctrine keyword patterns detected

Metrics

Total latency
3946.0 ms
Base LLM
3938.3 ms
Verifiers
0.2 ms
Gates
0.0 ms
Cost
$0.0025

Trail

05:27:38 received prompt_chars=57 verifiers=['scripture_anchors', 'theology_doctrine']
05:27:38 red_gate decision=pass reason=no disqualifying input patterns detected
05:27:42 base_llm_call model=anthropic/claude-sonnet-4-5 tokens_in=26 tokens_out=163 latency_ms=3938.3 cost_usd=0.0025
05:27:42 verifier:scripture_anchors verdict=NOT_APPLICABLE summary=0 Scripture citation(s) extracted
05:27:42 verifier:theology_doctrine verdict=NOT_APPLICABLE summary=no doctrine keyword patterns detected
05:27:42 floor_gate decision=pass reason=output above protective minimum; no mismatches
05:27:42 way_gate decision=pass reason=no declared way_path (Way check NA); no coercion language
05:27:42 execution_gate decision=deferred reason=no witnesses available (Witness Roll not yet constituted)
05:27:42 signed hash_algo=sha256 hash=sha256:25f7a08e858e35578781b9d7aa49e67ba3cb29ae41421a2bf248a263fba8ff74

Content hash

sha256:25f7a08e858e35578781b9d7aa49e67ba3cb29ae41421a2bf248a263fba8ff74

SHA256 over the canonical JSON (excluding this field). Tamper detection. Ed25519 signing planned for v2 once the operator’s signing key is provisioned on disk.

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