Security Framework for Single Sign-On in Cloud

Cloud is a leading technology used in current IT environment. Single sign-on allows users to enter their credentials one time to access multiple services. So authentication is main aspect for single sign-on and it must be more secured. Normally authentication is provided by only entering username and password but it is not sufficient because it is not secured to avoid brute-force attack, reply attack, etc. So we have designed a model for authentication which supports multi-level authentication process. In first step it is as normal authentication and then in next multi-level for authentication like pattern-matching and OTP on registered mobile.