Abstract: Cloud computing is an rising technology that has become today’s blistering analysis space as a result of the advancement of inflated property and it's most attention-grabbing and magnetized technology that offers the on demand services to the users over the web. Since Cloud Computing stores the user knowledge and permits the user to figure on the cloud system so the protection has become the most concern that creates threat and tries to deploy the Cloud environments. Even supposing the Cloud Computing is economical, there area unit several challenges for knowledge security, which can deduct the users from mistreatment the cloud computing. To confirm the protection of knowledge, we have a tendency to planned a technique of RSA rule and Cramer – Shoup cryptosystem.

Keywords: Cloud Security; RSA; Cramer; Shoup; Cryptosystem.