ESECU FIDO Key is a self-developed hardware authenticator complying with FIDO Universal Second Factor (U2F) standard. By adding an ESECU FIDO authenticator to user login, the security of online services with the existing password infrastructure is significantly enhanced. Users need not worry about their account information being stolen by phishing, hacking or viruses attack. By simply pressing a button, users can easily authenticate all U2F-enabled services and applications (e.g. Google, Github, Dropbox, etc) with the same device.