TOTP

Understanding Secret Keys, Base32 Encoding, and Time Steps

Explore why TOTP secret keys use Base32 encoding (A-Z, 2-7) and how time drift is handled by authenticators.

Super Admin
Published Sep 17, 2026
1 min read

Why Base32 Encoding Is Used for 2FA Keys

Base32 encoding uses a 32-character alphabet consisting of uppercase letters A–Z and digits 2–7. This avoids easily confused characters like `0` vs `O` and `1` vs `l`, making manual secret key entry error-free.

Handling Clock Drift

If your device clock differs slightly from the server clock, authentication can fail. Standard authenticators validate codes within a small window of previous and next time steps to ensure smooth login experiences.

Our Web Authenticator features dynamic time offset adjustment to handle system clock variations automatically.

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About The Author

Super Admin

Author is a software developer and technical contributor at AuthBro. They specialize in building performance-oriented browser productivity systems and writing developer guidelines.

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