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