Abstract: Cloud computing is a new era of the modern world. Reasons for development of cloud computing are different people and different purpose depends upon the demand. The improvement of the cloud technology also increases the security issues twice. So we need to solve the security issues in the cloud technology. In this paper, we have discussed about cloud computing security mechanisms and presented the comparative study of several algorithms. In future we are going to propose a new plan to solve security issues for both cloud providers and cloud users.

Keywords: Cloud, Security, Encryption algorithms, Security issues