IDPKC-to-TPKC Construction of Multi-receiver Signcryption

Multi-receiver signcrption is useful in many applications such as secure email systems. In this paper, we propose a new efficient construction of multi-receiver signcryption from identity-based public key cryptosystem to traditional public key cryptosystem. The new scheme enables a user in IDPKC successfully broadcast messages, not only in authentic way but also in privately way, to users in TPKC. Furthermore, the security proof shows the proposed scheme is secure under the hardness of Generalized Bilinear Diffie-Hellman Problem in the random oracle.