Two-Factor Authentication (2FA) is easy to integrate with Bitcoin-Central 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. Under 'Choose Authenticator' select 'Other' and scan or enter information manually as directed.
You can find additional information on activating SAASPASS Authenticator into Bitcoin-Central on this page.
The key differences between Google Authenticator and SAASPASS Authenticator: