According to the German Federal Office for Information Security (BSI), reliable protection of critical systems and data should be implemented with an integrated security solution that supports strong two-factor authentication at a minimum. Strong authentication goes well beyond the security provided by a single password. It requires other components (factors) to determine the identity of the user with certainty. The “knowledge” factor (password or PIN) is extended by the addition of another factor – the “possession” factor (smartcard, token, etc.) or “biometrics” (fingerprint, voice, etc.).