What algorithm does 2FA use?

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The algorithm used by Discourse for 2-Factor Authentication (2FA) is HMAC SHA 1. First_Name inquired about the algorithm due to issues with their 2FA app not recognizing Discourse. supermathie confirmed the algorithm and provided the equivalent oathtool command for generating TOTP codes.

1

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?

2

Yes. The equivalent oathtool command is

oathtool --totp -b «TOTPCODESTRING»

What are you using that it doesn’t recognise Discourse (presumably, it doesn’t recognise the QR code)?

Does it work with this?

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