User Device

Full Title or Meme

A portable User held computer with capability acting as or including a User Authenticator.

While it is possible to program a User Device to function with more than one user, this page will focus on a purely personal device.
Both separate user held devices, like FIDO U2F late binding tokens, or user credential held securely in a Trusted Execution Environment on a User Device like a Smart Phone are considered.
Biometric Attributes are taken to be exclusively the measure of human characteristics like fingerprint, facial and behavior patterns.
The human characteristics are another factor that can be a part of Multi-factor Authentication.
So the human characteristics can be considered to be a Credential.
The measurements of the characteristic are compared against a template of the characteristics using some Assurance level to produce a Validated claim.

False positives
False negatives
Attacks against the sensor capabilities. Various movie and television plots have shown the attacks like taking someone's eyeball, or using a thin-film replica of a finger print to complete an Authentication which Authorizes access.