Abstract: In cloud computing for the secure access of the data, data owners can go for the encryption that is based on the attributes to encrypt the data that has been stored in the data center. Users delegate the decryption part of work to the servers of cloud to reduce the cost of computing. So attribute based encryption technique comes into picture. But delegation by the servers of the cloud lead to the tampering of the data or not providing access to the eligible users for cost saving purpose.

Keywords: Verifiable delegation, Attribute based encryption, cipher text, outsourcing.