Secure Data Sharing in Cloud Computing Using Revocable Storage Identity-based Encryption Methodology: A Survey

Abstract

Cloud computing is one of the best ways to store, retrieve and share data which is easy, convenient and also beneficial for both the organization and individuals. But there are many of disadvantages because of which users hesitate to share data to the cloud as they contain important and valuable information. Therefore it is necessary to apply encryption on your user’s shared data, for this Identity-based encryption is one of common and promising approach to secure shared data. However access control is not static. That is, when some user’s authorization is expired, there should be a mechanism that can remove him/her from the system. Consequently, the revoked user cannot access both the previously and subsequently shared data. To overcome this problem Revocable-storage identity-based encryption (RS-IBE) is introduced, which can provide the forward/backward security of cipher text with functionalities like user revocation and cipher text update that takes place simultaneously. The performance comparisons indicate that the proposed RS-IBE scheme has advantages in terms of functionality and efficiency, and thus is feasible for a practical and cost-effective data sharing system. Keywords - Cloud computing, data sharing, revocation, Identity-based encryption, cipher text update, decryption key