Passwordless authentication is an authentication mechanism in which users log in to systems without typing a password. Instead, passwordless authentication usually takes the form of possession factor (something you have) or inherent factor (biometrics - something you are).

Passwordless authentication relies on a cryptographic key pair with a private and public key. The cryptographic key pair makes the passwordless method of authentication more secure.

Examples of passwordless factors that can be used to replace passwords:

Possession Factors:

• Hardware token
  
• Software token (using a phone)
• Smart card
  
• NFC tag

Inherent Factors:

• Fingerprint scan
• Facial recognition scan
• Iris scan
• Vein scan
• Behavioral factors such as typing walking and typing dynamics