TOTP[1] is a common one. I use the FreeOTP[2] Android app but there are plenty of other options. [1]: https://en.wikipedia.org/wiki/Time-based_One-time_Passwor

TOTP[1] is a common one. I use the FreeOTP[2] Android app but there are plenty of other options. [1]: https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm https://en.wikipedia.org/wiki/Time-based_One-time_Password_A... [2]: https://freeotp.github.io/ https://freeotp.github.io/