Two-factor authentication (2FA) is intended to make the login process more secure for Internet users. Users must also enter a code after entering their email address and password as usual.
Security researcher Anna Lena Fehlhaber from the University of Hanover says 2FA protects against account or resource theft. There is also a widespread assumption that a second device is absolutely necessary for 2FA. But according to chip.de experts, it is entirely possible to use your own smartphone for both steps of login process.