Cloud computing now-a-days growing rapidly and is an innovative computing model that delivers services on the internet for fulfilling computing demand of the users. There are different integrated technologies in cloud. Each has some loopholes, which raises several security and privacy concerns. One of the major security concerns in cloud computing is to protect against network intrusions that affect confidentiality, availability and integrity cloud resources and offered services. Hidden Markov model is a state transition based model in which the transition of states can be predicted using the probability distribution of one state to another.