Cloud computing is a recent computing model; provides consistent access to wide area distributed resources facing many problems as its usage increases. The emergence of cloud computing has made a tremendous impact on the Information Technology (IT) industry over the past few years. A recent survey by Cloud Security Alliance shows that security have become the primary concern for people to shift to cloud computing. Several methods are there to protect the cloud computing environment. Enormous loss to both cloud clients as well as cloud service providers happen even with small intrusions. Cloud computing environment should be secure enough in maintaining cloud clients trust level, as small intrusion can cause a huge loss to both cloud users as well as cloud service executives. Introduce a new method of intrusion tolerance can surely protect cloud platform. Provision of reliable and secure services in cloud computing environment is an important issue.
