Overview#

Two-Factor Authentication is an Authentication which has Two Authentication Factors and is a form of Multi-Factor Authentication

The most common types use either Tokens (Hard tokens or Soft tokens or One-Time Password Systems).

Some use a Biometric Token (Something You Are) as used in Biometric Authentication.

Most Common Two-Factor Authentication Systems#

The most common types use either Tokens (Hard tokens or Soft tokens or One-Time Password Systems).

The Good part is:

• Many on the market.
• Easy to integrate into existing systems.
• Typically used in VPNs (RADIUS type systems)
• Users understand the systems
• Any machine or device maybe used.

The not so good

• Single vendor commitment as no cross vendor standards. (Mitigated by use of OpenID Connect)
• Requires software and or Hardware be utilized for Implementation.!! More Information

There might be more information for this subject on one of the following:

• 2FA
• Apple ID
• Payment Services Directive
• RSA SecurID
• Sign in with Apple
• What To Do About Passwords