Providing High Security Assurance To Anti Collusion Information Distribution Scheme for Self-Motivated Clusters in the Cloud

Abstract

Benefited from cloud computing, users can get an effective and cost-effective way to swap data between cloud group members with low maintenance features and low running costs. Meanwhile, we must provide security assurance for data file exchange, since they are subcontracted. Unfortunately, due to frequent changes to the actual one, data sharing while retaining privacy remains a challenging issue, especially for a cloud that is unreliable due to collusive attack. In addition, for existing schemes, security of key distribution is based on the secure communication channel, however, having such a channel is a strong prerequisite and difficult to practice. In this document, we propose a secure data exchange schema for dynamic members. First of all, we propose a secure method to distribute keys without any secure communication channel and users can securely secure their private keys from the group administrator. Second, our schema can get detailed access control, any group user can use source in the cloud, and revoked users can not re-access the cloud after they've been revoked. Third, we can protect the scheme from collusion, which means that revoked users cannot get the original data file, even if they conspire with the unreliable cloud. In our approach, by

leveraging the polynomial function, we can get a safe user revocation scheme. Finally, our schema can achieve good efficiency, which means that earlier users do not need to modernize their private keys for the circumstances, if a new user joins the cluster or a user is withdrawn from the group