DefinePK

Abstract

Now a day’s everyone storing there data in cloud because we can’t depends on hard drives if they crash one can’t have backup for ever data. Famous Cloud storage applications are Drop box, Google drive, Sky drive, Box, Amazon cloud drive, Surdoc and Apple icloud. In cloud data security is provided by various security algorithms. In our research we have chosen attribute based encryption technique to encrypt the data in cloud. We have proposed new attribute based encryption techniques which is known as trust attribute based encryption. In trust attribute based encryption first we find the trust of the attribute in web site and second based on trust attribute we from the access policy to cipher text. We propose scalable revocation scheme to trust based attribute based encryption by applying proxy re-encryption and lazy re-encryption to trust based attribute based encryption to provide efficiently revoke rights to users. We compare trust based attribute based encryption with key policy attribute based encryption; cipher text policy attribute and Hierarchical attribute based encryption based on time and number of attributes. We prove that trust based attribute based encryption is efficient compare to existing techniques.