Warpcast

2FA stands for "Two Factor Authentication", that is, using two ways to authenticate yourself to a service. For example passwords is "Something you know", your cellphone is "Something you have". There is also "Something you are" (Biometrics). 2/14

Some people will tell you there is also "Somewhere you are" (Location-based authentication). This is not so simple to implement, though, so let's stick to "Something you know/have/are" 3/14

TOTP stands for "Time-Based One-Time Password Algorithm", and is derived from HOTP. Both defined at RFC 6238 and RFC 4226 https://datatracker.ietf.org/doc/html/rfc6238 https://datatracker.ietf.org/doc/html/rfc4226. 4/14