Designated-verifier proxy signcryption scheme

The identity-based proxy signcryptions can fulfill both the functions of signature and encryption efficiently. Combining with the designated-verifier signatures, using the bilinear pairings on elliptic curve, we construct a proxy signcryption scheme which can be used in the special circumstance that only the designated-verifier can verify. Analysis shows that our scheme is efficiency, and under the random oracle model our protocol is unforgeability.