What are the various authentication methods in existence today?

  • Single-Factor Authentication
  • Two-Factor Authentication (2FA)
  • Token authentication (2FA using purpose-built physical device)
  • Biometric authentication
  • Behavior biometrics e.g. keystroke dynamics, voiceprints
  • Multi-Factor Authentication (MFA)
  • Password Authentication Protocol (PAP)
  • Challenge Handshake Authentication Protocol (CHAP)
  • Extensible Authentication Protocol (EAP)
  • Single Sign-On (SSO)
  • Certificate-based authentication
  • Transaction authentication
  • Computer recognition authentication (Fingerprinting)
  • CAPTCHAs

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