Cloud computing is not fully mature and still lot needs to be explored. After our current work we are claiming that security is the most important threat to both the users and the vendors of cloud computing. Vendors, Researchers and IT security professionals are working on security issues associated with cloud computing. Different models and tools have been proposed but still nothing fruitful found. While doing research on security issues of cloud computing we came to know that there are no security standards available for secure cloud computing. In our future work we will work on security standards for secure cloud computing.