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In today’s organizations need for several new resources and storage requirements for terabytes of data is generated every day. Cloud computing provides solution for this in a cost effective and efficient manner. Cloud computing provides on demand resources as services to clients. Cloud is highly scalable and flexible. Although it is benefiting the clients in several ways but as data is stored remotely it has many security loopholes like attacks, data lose, other security and authentication issues. In this paper we are proposing an authentication model for cloud computing based on the Kerberos protocol to provide single sign-on and to prevent against DDOS attacks. This model can benefit by filtering against unauthorized access and to reduce the burden, computation and memory usage of cloud against authentication checks for each client. It acts as a third party between cloud servers and clients to allow secure access to cloud services. In this paper we will see some of the related work for cloud security issues and attacks. Then in next section we will discuss the proposed architecture, its working and sequential process of message transmission. Next we will see how it can prevent against DDOS attacks, some benefits and how it provides single sign-on.