Integrity Auditing with Homomorphic Encryption for Dynamic Cloud with Group user Revocation

With cloud computing, data owners are motivated to outsource their data from local sites to public cloud for great flexibility and economic saving. Recently, some research consider the problem of secure and efficient public data integrity auditing for shared dynamic data. But this scheme is not secure against collusion of cloud storage server. An efficient public integrity auditing with a secured group user revocation based on vector commitment and group user revocation. A distributed key generation algorithm is used to generate authenticated userpasswords across multiple servers and eliminate single point failures. This scheme supports the public checking and efficient user revocation and also provides confidentiality, efficiency andtraceability of secure group user revocation. A homomorphic encryption algorithm is also used forcreating unique id for the users.