Type-based proxy re-encryption is an effective and efficient cryptographic solution to ciphertext delegation and distribution
which also enables the ciphertext owners to carry out fine-grained delegation control.In this paper
we propose a new type-based proxy re-encryption scheme without pairings and prove it against the chosen-ciphertext attack (CCA) in the random oracle model.Compared with the existing type-based proxy re-encryption schemes constructed with pairings
our scheme owns better efficiency as well as the master key security.