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Cloud computing is an emerging computing paradigm that offers computational facilities and storage as services dynamically on demand basis via the Internet. The ability to scale resources and the pay-as-you-go usage model has contributed to its growth. However, cloud computing inevitably poses various security challenges and majority of prospective customers are worried about unauthorized access to their data. Service providers need to ensure that only authorized users access the resources, and for this they need to adopt strong user authentication mechanisms. The mechanism should provide users with the flexibility to access multiple services without repeated registration and authentication at each provider. Considering these requirements, this chapter deliberates a Single Sign-on based two-factor authentication protocol for cloud based services. The proposed scheme uses password and a mobile …