This page is currently queued for revision.
Multifactor Authentication (MFA)*
Acronyms, Abbreviations, and Initialisms
|Short Form||Full Form|
|TOTP||Time-Based One-Time Password|
Step-up authentication is an additional factor or procedure that validates a user's identity by using the following means:
- Challenge questions
- Out-of-band authentication (phone call or SMS)
- Dynamic knowledge-based authentication (questions unique to the end user)
Authentication requires a match against a template or a known quantity. Therefore, variables (such as variable keystrokes) aren't useful for authentication.
Multifactor authentication requires at least two of the following:
- Type 1: Something you know
- Type 2: Something you have
- Type 3: Something you are
In some cases, a fourth factor is mentioned:
- Type 4: Something you do (linked to something you are); physiological and behavioral, such as how you write or type.
This field is constantly evolving, and additional considerations include:
- Time-based one-time passwords (TOTPs)
- Somewhere you are (location based)