Which multifactor authentication method uses unique physical characteristics for identity verification?

The multifactor authentication method that utilizes unique physical characteristics for identity verification is biometrics. Biometrics rely on the individual’s inherent traits, such as fingerprints, facial recognition, iris patterns, or voice recognition, to authenticate their identity. This approach leverages the uniqueness and permanence of these physical characteristics, making it a robust method of securing access to systems and data, as it is significantly harder to replicate or spoof biological traits compared to traditional authentication methods.

In contrast, security tokens, smart cards, and passwords involve factors that are either something you possess or something you know, rather than something that is an intrinsic part of the individual. Security tokens generate one-time passwords but do not rely on physical traits. Smart cards also contain encrypted data and may require a pin or password for access. Passwords are knowledge-based authentication, requiring the user to remember a secret phrase or word, which does not relate to their physical characteristics. Thus, biometrics stand out as a unique authentication method based on individual physical attributes.