Two-factor authentication
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... 2FA is used as an additional security measure to protect user accounts.
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Use two-factor authentication whenever an online service allows it.
Many services have this feature disabled by default, but offer it anyway. It's worth checking your login procedures.
If your password or PIN falls into the wrong hands, your sensitive data is still well protected if it is protected from unauthorized access by a second factor.
So funktioniert die Zwei-Faktor-Authentisierung | BSI
Quelle: BSI
Further information
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