The great technological advances, the development of various means of connection and communication, the openness of the world to each other and the reliance on the transmission of various types of data over the networks have led to a risk of leakage of these data and access to the wrong people or competitors, thus became an urgent need to maintain information security. Application or computer system security encompasses measures taken throughout the code's life-cycle to prevent gaps in the security policy of an application or the underlying system through flaws in the design, development, deployment, upgrade or maintenance or database of the application. Applications only control the kind of resources granted to them, not the resources which are granted. Authentication is actually the process of confirming that identity. It might involve confirming the identity of a person by validating their identity documents and verifying the authenticity. Here a person can find an application Android relies on the many advantages of the Android system to authenticate a user on the mobile device, so that they can login to a system that is built, installed on the environment of the computer.