Cloud storage enables networked online storage where data is stored on multiple virtual servers, rather than being hosted on dedicated servers. Having remote database, there arises security problems. In order to maintain data integrity, proposed design consists of efficient methods that enable on-demand data correctness verification. In this paper, the authors put more focuses on the support of file-oriented cloud applications. The proposed system ensures effective security measures, utilizing the token pre-computation process and data encryption. Their security analysis shows that both internal and external attacks require exponential computational costs; that is, their scheme is computationally secure against these attacks.