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(i) Yes/No authentication facility, which may be carried out using any of the modes specified in regulation 4(2); and

(ii) e-KYC authentication facility, which may be carried out only using OTP and/ or biometric authentication modes as specified in regulation 4(2).

4. Modes of Authentication. — (1) An authentication request shall be entertained by the Authority only upon a request sent by a requesting entity electronically in accordance with these regulations and conforming to the specifications laid down by the Authority.

(2) Authentication may be carried out through the following modes:

(a) Demographic authentication: The Aadhaar number and demographic information of the Aadhaar number holder obtained from the Aadhaar number holder is matched with the demographic information of the Aadhaar number holder in the CIDR.
(b) One-time pin based authentication: A One Time Pin (OTP), with limited time validity, is sent to the mobile number and/ or e-mail address of the Aadhaar number holder registered with the Authority, or generated by other appropriate means. The Aadhaar number holder shall provide this OTP along with his Aadhaar number during authentication and the same shall be matched with the OTP generated by the Authority.
(3) A requesting entity may choose suitable mode(s) of authentication from the modes specified in sub-regulation (2) for a particular service or business function as per its requirement, including multiple factor authentication for enhancing security. For the avoidance of doubt, it is clarified that e-KYC authentication shall only be carried out using OTP and/ or biometric authentication.
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(ii) Alternate Modalities: Some applications may use different modalities for exception handling. Alternate modalities include:
(a) Iris Authentication
(b) OTP Authentication (if allowed by policy)
(iii) Biometric Fusion: UIDAI is introducing face authentication as secondary authentication factor to reduce the rate of authentication failures, especially for senior citizens. At this time, face authentication will be used only conjunction with another authentication factor such as finger/iris/OTP.