Cloud Security and Storage Space Management using DCACrypt

Cloud Computing is a new computing model that distributes the computing missions on a resource pool that includes a large amount of computing resources. More and more companies begin to provide different kinds of cloud computing services for Internet users at the same time these services also bring some security problems. Internet users are able to acquire computing resource, storage space and other kinds of software services according to their needs. In cloud computing, with a large amount of various computing resources, users can easily solve their problems with the resources provided by a cloud. Today most cloud computing system use asymmetric and traditional public key cryptography to provide data security and mutual authentication. This research helps in securing the data without affecting the original data and protecting the data. In this technique the data are segmented into three different levels according to their data importance ranking, set by data owner. The data in each level can be encrypted by using encryption/decryption algorithms and keys before store them in the Cloud. In this technique the aim is to store data in a secure and safe way in order to avoid intrusions and attacks. Also, it will reduce the cost and time to store the encrypted data in the Cloud Computing. In this paper conducts a performance analysis by implementing the Advanced Encryption Standard (AES) in all levels in order to check the performance of model.