Privacy-preserving cipher text multisharing

Privacy become important issue to protect data against unauthorized person. The need of providing privacy to not only data but also the information of delegators. So to make more privacy to data we are making use of new technique that is proxy re-encryption which include conditional sharing. In Proxy re-encryption, a semi-trusted proxy can transform a cipher text to more secure cipher text that the receiver can decrypt the data by the key provided to them. However, the proxy cannot access the plaintext. Privacy to the data in such a way that including data and the information related to delegators is stored only on the server nowhere else it is available. Cipher policy attribute based encryption is a more efficient and flexible as the encrypted can control the access structure when encrypting a message. Meanwhile, a user can obtain secret keys from multiple authorities without releasing is global identifier and attributes to them.