Cloud computing is an Internet-based computing, whereby shared resources, software, and information are provided to computers and other devices on demand. However, adopting a cloud computing paradigm may have positive as well as negative effects on the data security of service consumers [1]. Cloud Computing is a term used to describe both a platform and type of application. As a platform it supplies, configures and reconfigures servers, while the servers can be physical machines or virtual machines. On the other hand, Cloud Computing describes applications that are extended to be accessible through the internet and for this purpose large data centers and powerful servers are used to host the web applications and web services. Authentication is one the most important security primitive [6]. Password authentication is most widely used authentication mechanism. Password provides security mechanism for authentication and protection services against unwanted access to resource. In this paper, we applied a technique to preserve our password using graphical authentication.
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