The number of reported web application vulnerabilities is increasing dramatically. The most of vulnerabilities result from improper input validation. This paper presents extensions to the Tainted Mode model which allows intermodule vulnerabilities detection. Besides, this paper presents a new approach to vulnerability analysis which incorporates advantages of penetration testing and dynamic analysis Henceforth, it is required to have secured services. The main concern is to provide security to end user to protect files or data from the unauthorized group. The web application is now used to performs an intelligent standard of collection of services, applications, information, infrastructure comprised of pools of computer, network, information, and storage resources. With these advantages storing a large amount of data including important information on websites motivates a highly accomplished hacker to hack the critical information also. Hence, security is considered a topmost issue in cloud computing. This paper aims at analyzing encryption algorithms based on factors such as cost, time, key length and block size. The analysis indicates that several algorithm and various tools help in improving security to save the data