There are many applications hosted by different cloud service providers. Predominantly, there are email and social networking applications. These applications are being subscribed to and used by many people from different parts of the world. Typically, users need to memorize and use different credentials for accessing each of these customer-centric, collaborative, and cloud applications. Managing multiple credentials is a tough assignment. The solution is to implement an authentication mechanism that can use the proven concept of federated identity. This is accomplished by separating the aspect of user authentication from the application logic code and delegating the authentication requirement to a trusted and third-party identity service provider. The trusted identity providers can authenticate users on behalf of application service providers. The identity service providers have, for example, a Microsoft, Google, Yahoo!, or Facebook account. This identity pattern can simplify development, minimize the requirement for user administration, and improve the user experience of the application.