TOTP vs HOTP: What Is the Difference?
Learn TOTP vs HOTP, how TOTP authentication works, common configuration issues, privacy considerations, and when to use the ToolNivo 2FA Code Generator.
Core concept
HOTP is standardized in RFC 4226, while TOTP is standardized in RFC 6238 and uses HOTP as a building block.
How it works
HOTP advances with an event counter. TOTP derives its moving factor from time, so its values rotate on a schedule.
Settings that must match
Time-based values are convenient for interactive authentication, but the verifier and authenticator still need compatible settings and sufficiently aligned clocks.
Common mistakes to avoid
TOTP and HOTP are not interchangeable simply because they use the same visible secret format. Their moving factors differ.
Security and recovery
For an existing account, use the OTP method configured by the provider rather than choosing a mode based on preference.
Standards note: Technical explanations follow RFC 6238 and, where relevant, RFC 4226. Always follow your account provider's configuration and recovery instructions.
Frequently asked questions
Can a TOTP generator bypass 2FA?
No. It needs the correct shared secret and matching settings.
Does TOTP depend on the device clock?
Yes. TOTP uses time as part of its moving factor, so significant clock disagreement can cause rejection.
Should I share my TOTP secret?
No. Treat the shared secret as sensitive authentication material.