Aadhaar authentication is not one thing. UIDAI supports several modes, and knowing the difference helps you understand what a given verification actually proves and what it needs to work. This is a plain explainer of the main types.
OTP authentication
The most familiar mode: the resident approves a one-time password sent to their Aadhaar-registered mobile, and UIDAI confirms the match. It needs connectivity and the registered phone, and it is well suited to receptions and online onboarding. See Aadhaar OTP verification explained.
Biometric authentication
Here the resident presents a fingerprint or iris on a certified device, matched against UIDAI records. It removes the dependency on a registered phone but requires biometric capture hardware — and, because it handles biometric data, extra care under privacy rules (see biometric data and the DPDP Act).
Demographic authentication
This checks demographic details (like name and date of birth) against UIDAI records for a yes/no match. It is typically used to corroborate other information rather than as a standalone identity proof.
And the offline route
Separate from these online modes, offline verification (OVSE) validates a UIDAI-signed artefact with no live call at all — see online vs offline. It is the practical choice where connectivity or a registered phone can not be assumed.
Which Certopact uses
Certopact Entry verifies via online AUA/KUA (OTP) and offline OVSE, with DigiLocker, name-match scoring and Live Face — chosen per location. Learn more about Aadhaar visitor verification. This is general information, not legal advice.