Authentication Methods

TL; DR

Authentication is the process of verifying the identity of users, devices, or systems

It answers the question of whether the client has the right identity to access the resource.

Authentication Factors

• Knowledge, ie what one knows such as passwords, PINs, security questions
• Possession ie what one have such as tokens, smart cards, mobile devices
• Inherent ie what one is such as biometrics information like fingerprints, face
• Behaviour ie what one does such as typing patterns, mouse movements, immediate browsing history

Multi-Factor Authentication (MFA)

Combines multiple factors for stronger security:

• Something you know + Something you have
• Significantly reduces successful attacks
• Standard requirement for sensitive systems

Modern Authentication Trends

• Passwordless Authentication - Eliminates passwords entirely
• Single Sign-On (SSO) - One login for multiple systems
• Risk-based Authentication - Adaptive based on context
• Continuous Authentication - Ongoing verification

Factors to consider when deciding on authentication methods

• User experience vs security balance
• Backup authentication methods
• Legacy system integration challenges
• Compliance requirements (NIST, ISO 27001)

Authentication systems integrate with [/20250706214223575484]] platforms like Microsoft Entra ID to provide comprehensive security frameworks.

Further questions

• Which method is better?