IoT is revolutionizing the world. One of its renowned applications is a smart door lock system to protect the valuables and secrets behind the door. In IoT based system the user is transmitting his confidential data over the network which may contain passwords and other information, which are as crucial as the secrets or valuables behind the door. To resolve the valuables security and information security issues, we uniquely propose a password based and cryptographically shielded highly secure door lock system. We designed and developed a complete system including an Android smartphone app, using cryptographic algorithms for secure communication and programmable hardware with sensors and actuators in order to control unauthorized access. This cryptoLock not only protects our valuables behind the door but also it protects our data which is being transmitted over the network. It gives easy remote access, controls unauthorized access and gives a complete sense of security.