Two-Factor Authentication (2FA) is easy to integrate with Bitcoin.de by using the SAASPASS Authenticator(works with google services like gmail and dropbox etc.) and it's Multi-Factor Authentication (MFA) capabilities. The SAASPASS Authenticator supports the time-based one-time password (TOTP) standards. Download the SAASPASS app and setup the SAASPASS Authenticator.
You can find additional information on activating SAASPASS Authenticator into Bitcoin.de on this page.
Log into bitcoin.de. In the upper right hand corner, click the dropdown and choose ‘Settings’.
Under ‘Security’ choose ‘Activate smartphone/One-Time Password’. Open your SAASPASS app, choose ‘Authenticator’, ‘Other’, ‘Scan Barcode’, and scan the barcode on your screen with your app. Then enter the code produced by SAASPASS.
The key differences between Google Authenticator and SAASPASS Authenticator: