User Revocation Based Anonymous Access Provision for Efficient Cloud User Privacy

Cloud computing is a recent technology provides a flexible, on-demand and low cost feature of computing resources. The Main issue in Cloud Computing is user identity privacy and data content privacy. The User Privacy in Cloud Computing is achieved by various data access control Schemes. Existing Fully Anonymous Access control scheme with decentralized attribute authority provides data content privacy and also prevents full user identity leakage by using N-oblivious transfer and multi-authority ciphertext-policy attribute based encryption scheme. But user attribute revocation is not implemented for better security. Supporting user revocation over Anonymous Multi-authority Ciphertext-policy attribute based encryption (MA-CP ABE) is an important issue in the real application. We Propose a Revocable Anonymous Access Control with Multi-authority cloud storage system to enhance the security and to solve revocation problem, Here Each Individual Attribute Authority is able to issue the attributes and keys independently. Our Revocable Anonymous Access Control Scheme for Multi-Authority Ciphertext-Policy Attribute Based Encryption can achieve both forward and backward security. Our security analysis and performance analysis shows that our scheme is more secure and more efficient than previous work. KeywordCP-ABE, Anonymity, Multi-Authority, Cloud Storage, Access Control, Attribute Revocation __________________________________________________________________________________________________