Outsourcing Data based on Key Exchange and File Encryption with Integrity Check

Abstract

Cloud computing is a developing innovation and it gives different services to clients. The most attractive service of cloud computing is Data outsourcing. By Data Outsourcing the data owners can have any size of data on the cloud server and clients can retrieve data from cloud server when required. Cloud storage system provides facilitative file storage and sharing services for distributed clients. To address controllable outsourcing, integrity and origin auditing concerns on outsourced files, proposes an Identity Based Data Outsourcing (IBDO) scheme outfitted with attractive highlights worthwhile over existing systems in securing outsourced data. First, IBDO scheme allows a user to authorize devoted intermediaries that means dedicated proxies to upload data to the cloud storage server on her behalf, e.g., an organization may approve a few workers (proxies) to transfer documents to the organization's cloud account in a controlled way. In IBDO framework, to designate outsourcing rights to a proxy, the administrator signs a committed warrant for the proxy. The warrant may indicate who can outsource which sort of documents during what time in the interest of the data owner. The proxies are authorized and identified with their recognizable identities, which takes out complicated certificate management in usual secure distributed computing systems. The key exchange between administrator and users are done by ECDH (Elliptical Curve Diffie Hellman) algorithm. Second, IBDO scheme facilitates comprehensive auditing, that is, IBDO scheme not just allows regular integrity auditing as in existing schemes for securing outsourced data, yet in addition permits to audit the information on data origin, type, and consistence of outsourced files. The security of the files are also ensured in this system by encrypting the files using AES (Advanced Encryption Standard) algorithm.