A Efficient Data Sharing Scheme for Dynamic Groups in the Cloud

Abstract

As per the rapid growth and essentiality for providing security in cloud. In this we propose A Secure Anti-Collusion Data Sharing Scheme for Dynamic Groups in the Cloud by using Identity based Encryption. Meanwhile, we must provide security guarantees for the sharing data files since they are outsourced. Unfortunately, because of the frequent change of the membership, sharing data while providing privacy-preserving is still a challenging issue, especially for an untrustedclouddue to the collusion attack.Firstly, we propose a safe route for key dispersion with no safe correspondence channels, and the clients can safely acquire their private keys from gathering administrator. Besides, the plan can accomplish fine-grained access control, any client in the gathering can utilize the source in the cloud and refused clients can't get to the cloud again after they are rejected. Thirdly, we can protect the plan from trickery attack, which implies that rejected clients can't get the first information record regardless of the possibility that they scheme with the untrusted cloud. In this methodology, by utilizing polynomial capacity, we can achieve a protected client denial plan.