International Journal of Emerging Technology in Computer Science and Electronics ( IJETCSE)
Trust negotiation is an approach to establishing trust between strangers through iterative disclosure of digital credentials. In this model, the access control policy for a resource is usually unknown to the party requesting access to the resource, when trust negotiation starts. Many organizations outsource their data management needs to an external service provider to relief the burden of storage management, universal data access with independent geographical locations, and avoidance of capital expenditure on hardware, software, personnel maintenance. To ensure the data security and integrity in cloud storage, CP-ABE scheme a promising cryptographic solution, enables data owners to define their own access policies over user attributes and enforce the policies on the data to be distributed.