Abstract: A biometric authentication system for authenticating user(s) without requesting any personal information or device from the user(s) is disclosed. The system includes an onboarding module to enable the user(s) to register with the system. An input module receives the registration information from the user(s) and a machine learning module detects blur and bad image in the registration information. A verification module registers the user and creates a record by verifying the registration information with an issuing authority. A 3D liveliness detection module scans a face of the user, and creates a 3D face map of the user in real-time. An authentication module authenticates an identity of the user by searching for a matching record based on the face scan from pre-stored records and when a matching record is found. The user is authenticated without requesting any personal information and also 3D face map is deleted after authentication.