Authentication is the process of verifying the identity of a user, device, or system before granting access to resources, applications, or data. It ensures that only authorized individuals can access sensitive information and perform specific actions within a network or system.
Common authentication methods include:
Passwords or PINs: The most basic form of verification.
Biometric Authentication: Uses fingerprints, facial recognition, or retina scans.
Two-Factor Authentication (2FA): Combines two methods, such as a password plus a verification code sent to a mobile device.
Token-Based Authentication: Uses security tokens or digital certificates for verification.
Authentication is critical in cybersecurity, protecting accounts, networks, and digital services from unauthorized access, identity theft, and data breaches. It is widely used in online banking, email accounts, cloud services, enterprise systems, and government networks.
Authentication works closely with authorization, which determines what an authenticated user is allowed to do within a system. While authentication verifies identity, authorization defines access levels and permissions.