Section 4(2)(c) in AADHAAR (AUTHENTICATION AND OFFLINE VERIFICATION) REGULATIONS, 2021
(c)Biometric-based authentication: The Aadhaar number and biometric information submitted by an Aadhaar number holder are matched with the biometric information of the said Aadhaar number holder stored in the CIDR. This may be fingerprints-based or iris-based authentication or other biometric modalities based on biometric information stored in the CIDR.