Abstract: Secure access control system in banking or similar operations includes, at least a server (1) or host element in communication with a banking environment (5), a biometric device (2), a client element (3) and the communication elements (4) between the server element (1) and the client element (3), the elements being configured in such a way that an “applet” component built into the server element (1) initiates the control process (41) requesting the authentication (42) of the biometric device (2), performing the authentication by a certificate of the biometric device. T biometric device requests the biometric data (43), the data being verified by comparison with the biometric data recorded in a prior process and generating a password (OTP) which is sent to the server element (1) for validation, the banking environment (5) being informed thereof and responding with the user customized environment (49) if the authentication is positive, the environment being displayed in the client element (3).