In the last few years, Cloud computing is one of the most emerging technology in the world of computation. This technology provides services with one of the three service models: Software as a Service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). This model allows users and organizations to share their vital information, crucial computing resources across the world. Securing these essential resources from the unauthorized access of the users is one of the major issues which leads to reduce the growth of this technology in the Information Technology (IT) Industries. Authentication is one of the major security parameters while providing access of the registered services to the intended users. Single-tier authentication relies on username and password for accessing the registered services which is not sucient to secure from some well known attacks like brute-force attack, replay attacks, etc. so a solution to this issue; we come up with multi-tier authentication using single- sign on access of registered services. Multi-tier authentication security relies on the username and password as well as pattern matching and one-time password (OTP).
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