friendica_2020-09-1_sharedHosting/doc/Two-Factor-Authentication.md

Configuring two-factor authentication

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You can configure two-factor authentication using a mobile app. A time-based one-time password (TOTP) application automatically generates an authentication code that changes after a certain period of time.

Tip: To configure authentication via TOTP on multiple devices, during setup, scan the QR code using each device at the same time. If 2FA is already enabled and you want to add another device, you must re-configure 2FA from your security settings.

Enabling two-factor authentication

1. Download an authenticator app

Any authenticator app should work with Friendica. Notheless, we recommend:

• For iOS, Matt Rubin's MIT-licensed Authenticator app.
• For Android, andOTP.

2. Record your one-use recovery codes

From your two-factor authentication user settings, enter your password and click on "Enable two-factor authentication".

You will be presented with a list of one-use recovery codes. Please save those in the same place you are saving your Friendica password (ideally, in a password manager like KeePass).

When you're done, click on "Next".

3. Setup your authenticator app

You have three methods to setup your authenticator app:

1. Scan the QR Code with your device camera. This will automatically configure your account on the app.
2. Click/tap on the provided totp:// URl. Ideally your authenticator app should be called with this URL and set up your account.
3. Enter your account settings manually. Friendica is using default settings for token type, code digit count and hashing algorithm but you may be required to enter them in your app.

Tip: If you have multiple devices, configure them all at this point.

Then verify your app is correctly configured by submitting a code provided by your app. This will conclude two-factor authentication configuration.

Note: If you leave this screen at any point without having submitted a verification code, two-factor authentication won't be enabled on your account. To complete the configuration, just come back to your two-factor authentication user settings and click on "Finish configuration" after entering your current password.

Disabling two-factor authentication

You can disable two-factor authentication at any time by going to your two-factor authentication user settings and click on "Disable two-factor authentication" after entering your current password.

You should remove your Friendica account from your authenticator app as it won't work again even if you reenable two-factor authentication. In this case you will have to configure your authenticator app again using the process above.

Managing your one-time recovery codes

When two-factor authentication is enabled, you can show your recovery codes, including the ones you've already used.

You can freely regenerate a new set of fresh recovery codes, just be sure to replace the previous ones where you saved them as they won't be active anymore.