Signature

Overview

Signatures may be handwritten, electronic, or cryptographic. Digital signatures use a private key to create verifiable evidence linked to message content, while legal electronic signatures may rely on broader identity, intent, consent, and record requirements.

A valid cryptographic signature proves control of a key for the signed bytes, not necessarily the signer’s real-world identity, understanding, authority, or freedom from coercion. Ambiguous encoding can also cause users to approve a different meaning than expected.

Systems should bind signatures to exact content, domain, purpose, version, and intended recipient; protect signing keys; and preserve verification evidence. High-impact actions need readable intent, appropriate authorization, replay protection, and procedures for revocation or disputed signatures.

For Signature, repeated renewal is a signal that the underlying design needs correction.

Metrics for Signature should distinguish coverage, control execution, alerts, confirmed outcomes, losses, false positives, processing time, exceptions, and unresolved actions.

A signature is evidence that a specific signer approved or authenticated defined data, an action, or a document under an accepted method. A signature is meaningful only when signer identity, authority, intent, exact content, key custody, context, and verification evidence are properly established.

A production treatment of Signature should test evidence that a specific signer approved or authenticated defined data, an action, or a document under an accepted method within the relevant asset, decision, or service state. The Signature context record for evidence that a specific signer approved, authenticated defined data, and action should preserve source data, configuration or policy version, responsible actor, exception, and outcome. Review of Signature should determine whether safeguards addressing evidence that a specific signer approved, authenticated defined data, and action changed exposure in practice, not merely whether a document or setting existed.