Securing Cloud Data under Key Exposure

Cloud storage in public systems has become a major issue to control data access. A pliable and most secure way to secure the data in the cloud severs for cloud storage is by using Ciphertext-Policy Attribute-Based Encryption (CP-ABE). But, in existing scheme the secure key distribution and verification is done by a single attribute authority which take a lot of time. When it is done by the single attribute authority, it is like a single-point play acquired in a big cloud storage system. There will be users who will be waiting for secret keys for a long-time which result in the less efficiency of the system. Many solutions have been proposed like multi authority scheme to overcome this problem but was unable to overcome this problem. So, in this paper we propose a new way to overcome this problem by using auditing mechanism. Auditing mechanism is like employing multiple attribute authorities to share the work in providing secret keys to the users who have been waiting for long time in queues. In this paper, the generation of keys is done by the Central authority for verified users. In this each authority is managed by the attribute individually. To improve the security of the process we also propose a mechanism which can detect the incorrectly verification process. Analysis shows that this process has great impact on the cloud security and its performance is better.