3

I've set up Google authenticator as 2FA for ssh and it works great, but authenticator app for Android is not open source anymore. Is there a good real open source alternative?

3

Try FreeOTP, it supports both ​HOTP and ​TOTP.

https://fedorahosted.org/freeotp/

https://f-droid.org/repository/browse/?fdfilter=freeotp&fdid=org.fedorahosted.freeotp

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