Erickson

As a requirement for my Bachelor degree, I'm asked to release to google play a version of my application. The project objective is to build an application that can scan a qrcode and authenticate the user through a service provider. The layout is simple and the main functionality of the authentication is on the server and consist of two steps:

1. Registration: After scanning, User will send his identity to the Service provider. The service Provider will compute a hash function and send to the user the value of that hash function for later authentication.

2. Authentication: During this phase, the user will send to the server the hash value previously saved and a time stamp T. The server will check for the correctness. If it is invalid, then reject if. Otherwise, authenticate the user