# What algorithm does 2FA use?

**URL:** <https://meta.discourse.org/t/what-algorithm-does-2fa-use/330478>\
**Category:** Support\
**Created:** [October 11, 2024, 6:16pm UTC](https://meta.discourse.org/t/what-algorithm-does-2fa-use/330478 "2024-10-11T18:16:47Z")\
**Posts on this page:** 1\
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**Author:** ![First\_Name](https://avatars.discourse-cdn.com/v4/letter/f/7ab992/32.png) [@First\_Name](https://meta.discourse.org/u/First_Name)\
**Post date:** [October 11, 2024, 6:16pm UTC](https://meta.discourse.org/t/what-algorithm-does-2fa-use/330478/1 "2024-10-11T18:16:47Z")

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My 2FA app doesn’t recognize Discourse, and I need to input the data myself before I can add the code. What algorithm is the 2FA? Is it HMAC SHA 1?

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