An inherence factor authenticates a user through something they are, typically a biometric characteristic. Common examples include facial, palm, fingerprint, and retinal scans. section 11.3.2
Inherence is one of three multifactor authentication categories: knowledge means something you know, possession means something you have, and inherence means something you are. Multifactor authentication requires factors from different categories; combining a password and PIN does not qualify because both are knowledge factors. section 11.3.2 section 11.6
Cross-category authentication
A restricted area can require a badge touch, a possession factor, followed by a fingerprint scan, an inherence factor. A network login can combine a username and password with an SMS code sent to a smartphone; the code depends on possession of that device. section 11.3.2
For exam identification, classify these inherence methods:
- Facial scan section 11.3.2
- Palm scan section 11.3.2
- Fingerprint scan section 11.3.2
- Retinal scan section 11.3.2
