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In this research, we proposed robust authentication mechanism using user’s biometrics signals for complementing traditional authentication’s weak points. Nowadays, authentication system are developed using biometric. Biometrics are a unique, measurable a trait of a human being for verifying his/her identity. The types of biometric used in authentication system are iris, fingerprint, vein pattern, hand geometry etc. A biometric system provides an automated method of identifying a human being based on his/her biometric characteristics. But there are some security problems. Some biometrics can be copied by a malicious user with scanners. All biometrics characteristics extracted from a user are not possible to maintain a steady normal condition. So, we tried to apply user’s biometrics signals to authentication system as 3rd authentication factor. A biometrics signal is a pattern recognition that uniquely identifies human being based on his/her physiological traits. A biometrics signals should be impossible to masquerade or manipulate. This attribute is used as 3rd authentication phase. Proposed authentication mechanism is composed of 3 layered authentications; ID&P/W, PIN number or biometrics, and biometrics signals.