Method — Liveness Proof
Independent, jurisdiction-neutral, non-advisory reference.
Scope Framing
This domain defines liveness proof as a structural concept describing how authentication systems verify that a real, physically present human subject participates in a verification process.
The reference focuses on terminology stabilization, structural interpretation of verification phases, and boundary clarification within identity authentication environments.
The site does not interpret biometric system performance, regulatory identity frameworks, or operational authentication infrastructure design.
Conceptual Discipline
- Descriptive terminology only
- No prescriptive security guidance
- No implementation instructions
- No jurisdiction-specific assumptions
- No liability attribution
- No vendor-specific biometric or authentication systems
Lifecycle Perspective
Liveness proof is treated as a structural phase within authentication and identity verification processes.
The reference therefore focuses on the verification moment in which a system must determine whether a biometric or behavioural signal originates from a live human subject rather than from a replay, artifact, or presentation attack.
Lifecycle interpretation includes:
- signal capture from a subject
- challenge or stimulus mechanisms
- evaluation of biometric or behavioural response
- detection of presentation attacks
- authentication continuation after successful verification
Boundary Integrity
Liveness proof is treated as a structural verification event within authentication systems.
It is not:
- a biometric system certification framework
- a regulatory identity compliance interpretation
- a security architecture specification
- a forensic investigation method
- a deployment guide for authentication infrastructure
Update Rules
Changes are permitted only when:
- the definitional boundary of liveness proof materially evolves
- institutional standards affecting biometric verification models change
- structural clarification improves terminology precision
Minor editorial corrections are not logged. Material changes are recorded in /changelog/.