Framework for Security of Shared Data in Cloud Environment

The data security in cloud computing is formidable task. The privacy of shared data and its integrity in untrusted public environment is highly subject to skepticism. Many approaches have been designed to audit cloud data. However issues with existing mechanism are weak authorization and access data control which is also a threat to identity privacy in dynamic group environment. In this paper a new framework is proposed for securing privacy and identity of owner and its data. This framework is referred as Privacy Preserving Authentication Privilege Access Data Integrity (PP-APADI). It leverages the enhance identity management using two factor authorization and enforced fine grained privilege access control in shared pool of resources. It uses Cipher-text Attribute Based Encryption (CP-ABE) for anonymous data access control. Besides random dynamic group key signature and efficient revocation handling mechanism is used to dual the security layer. This combined approach helps public auditing in cloud data without exploiting privacy of owner to public verifier. It also supports file sharing, recovery and replacement in a multi-tenant dynamic group environment.