User Authentication Methods

1. Password-Based Authentication

Password-based authentication is the most common method of verifying a user's identity. It involves the user providing a secret password that matches the one stored in the system's database. This method is widely used due to its simplicity and ease of implementation.

Example: When you log into your email account, you enter your username and password. The system checks if the password matches the one associated with your username.

2. Multi-Factor Authentication (MFA)

Multi-factor authentication (MFA) enhances security by requiring users to provide two or more verification factors to gain access. These factors typically include something the user knows (like a password), something the user has (like a mobile device), and something the user is (like a fingerprint).

Example: After entering your password, a banking app might send a one-time code to your mobile phone. You must enter this code to complete the login process.

3. Biometric Authentication

Biometric authentication uses physical or behavioral characteristics to verify a user's identity. Common biometric methods include fingerprint scanning, facial recognition, and iris scanning. This method is highly secure but requires specialized hardware.

Example: When unlocking your smartphone, you can use your fingerprint or face to authenticate, bypassing the need for a password.