With digital services growing cyber threats like phishing, credential stuffing, brute-force attacks and identity theft are on the rise. Old single-factor authentication systems that only use passwords are not enough to protect information and critical systems. This paper looks at how Two-Factor Authentication (2FA) can improve security. 2FA is a security method that requires users to give two verification factors to access a system. It combines least two of the following: 1. Something the user knows (password or PIN) 2. Something the user has (OTP token, smartphone or smart card) 3. Something the user is (verification). By adding a layer of security 2FA greatly reduces the risk of unauthorized access even if passwords are compromised. The study looks at 2FA techniques, including: ? SMS-based One-Time Passwords (OTP) ? Time-Based One-Time Passwords (TOTP) ? hardware tokens, ? biometric authentication. It checks how well they work, how easy they're to use the challenges of implementing them and potential vulnerabilities like SIM swapping and phishing attacks. The paper also looks at real-world examples of organizations that used 2FA to prevent security breaches. It discusses practices for integrating 2FA into web applications using secure protocols and encryption standards. The research concludes that 2FA is a cost- practical solution for improving cyber security in areas like banking, education, government and enterprise environments. The use of -layered authentication mechanisms is crucial, in building strong digital ecosystems and protecting confidential information against evolving cyber threats, Two-Factor Authentication (2FA) helps to achieve this.
Cyber Security, Two-Factor Authentication (2FA), Multi-Factor Authentication (MFA), One-Time Password (OTP), Biometrics, Phishing, Identity Theft, Data Protection
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