With the development of cloud computing, Data security becomes more and more important in cloud computing. This paper analyses the basic problem of cloud computing data security. Since Cloud Computing share distributed resources via network in the open environment thus it makes security problems. In this method, we use Grid selection and Pass Point algorithms. This algorithm process on the image to get the pixel points and the points were used as a secret key for the file uploaded by the user. These techniques were different from the usual technique like Text Based Password or randomized key authorization has some difficulties that users have tended to write passwords down manually.

Keywords: Graphical password, password, co-ordinates, CaRP, Captcha, Dictionary attack, password guessing attack, security primitive ;