Cloud is future of information technology and rapid Growth of Cloud Computing in recent years has raised many security concerns one of which is the security of data in the cloud. As cloud computing works on internet challenge of secure data transfer comes with it, and the thus question of how to build cloud computing environment secure is one of the hot research subjects. In this paper, we outline the Data Security Challenge and introduce an ASCII based Cryptography algorithm for secure transmission of data between client and cloud. © 2016, International Journal of Pharmacy and Technology. All rights reserved.