International Journal of Computer Science and Mobile Computing (IJCSMC)
Today, there is a demand of distributed data security in data sharing system such as social network or cloud computing challenging issue in data sharing system is access policy and support of policy update. The cryptographic solution to this issue is cipher text policy attribute based encryption. In which data owner defines their access policy over user attribute and applies this policy on data. The problem introduce the scheme is called as key escrow problem, in which key generation center decrypt any message which addressed to the User by generating there private key.