This proves that you have access to the secret, and can only be used once. To secure his Lego mini-figures, [Luca] built an authentication system using Google Authenticator and Arduino.

It also based on Android and Arduino platform both of which are free open source software. In this paper, a system called door locks automation system using Bluetooth-based Android Smartphone is ...

Passwords. As the world marks World Password Day, cybersecurity experts in the UAE are issuing a clear warning: neglecting your digital front door is an open invitation for attackers.