What TOTP is and how 2FA codes work
A practical guide to TOTP, one-time code generation, and safe token handling.
How TOTP works
TOTP uses a shared secret token and current time. The code refreshes every 30 seconds.
Why time sync matters
If device time is skewed, services can reject valid-looking codes.
Common use cases
TOTP protects logins for email, exchanges, control panels, and other accounts.