Trust and security have prevented businesses from fully accepting cloud platforms. To protect clouds, CSP (Cloud Service Providers) must first secure virtualized data-center resources, maintain user privacy, and preserve data integrity. Using a trust-overlay network over multiple data centers to implement a reputation system for establishing trust between service providers and data owners is becoming mandatory. Data coloring and software watermarking techniques protect shared data objects and ensures the security level in the cloud. These techniques safeguard multi-way authentications, enable single sign-on in the cloud, and strengthen the security for accessing confidential data in both public and private clouds. However the problem is, once the onetime authentication is done with Cloud Service Provider (CSPs), there is no guarantee that only the legitimate user is accessing the confidential data and maintaining privacy till the user quits the secured cloud. Hence to provide the continuous authentication the proposal has been designed.