Category

# \#tech

 1 post in `tech` on the Who's OOO blog.

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 April 23, 2026

##  [ Adding Two-Factor Authentication to Who's OOO ](https://whoisooo.app/blog/adding-2fa-to-whosooo) 

How I added optional 2FA to Who's OOO: encrypted TOTP secrets, Argon2id backup codes, rate limiting, and no open-redirect traps.

 [\#tech](/blog/tag/tech/)

 [ Read more  — Adding Two-Factor Authentication to Who's OOO ](https://whoisooo.app/blog/adding-2fa-to-whosooo)