Abstract: The technology of engineering science is growingfaster and its usage isto bootincreasing speedily. The data and its usage has become an important issue in existence. There by the storage of data may be a crucial issue in means of life. For this data storage, Cloud Computing is useful. Cloud computing is that the follow of using a network of remote servers hosted on internet to store, manage and methodology data on demand and pay as per use. It provides access to a pool of shared resources instead of native servers or personal computers. as a result, outfit do not acquire the things physically, it saves managing value and time for organizations. As a result of the sector of cloud computing is spreading the new techniques are developing. This increase in cloud computing setting to boot can increase security challenges for cloud developers. Most of the organizations are an excellent deal concerned regarding the possession of their data.This analysis paper presents a review on the cloud computing concepts yet as security issues inherent at intervals the context of cloud computing and cloud infrastructure. This paper in addition analyses the key analysis and challenges that presents in cloud computing and offers best practices to service suppliers yet as enterprises. The foremost goal is to review different types of attacks and encryption techniques to secure the cloudmodel.