Two-factor authentication (2FA) overcomes the insecurity of passwords by adding a second factor to the authentication process. A variant of 2FA, which is even phishing-resistant unlike, e.g., SMS-based implementations, is offered by the FIDO2 protocol. In 2018 its compatibility with eID, the German electronic identification system, which is built into every German ID card, was published. Thus, users who own a German ID card may use it as a second factor to secure their online accounts.
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Keil et al. (2022) studied this question.
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