Heterogeneous signcryption

a cryptographic primitive

can simultaneously provide the confidentiality and unforgeability of data transmission between different public key cryptography.The paper gives the definition and security models of CLPKC-to-TPKI heterogeneous signcryption scheme between CLPKC (Certificateless Public Key Cryptography) and TPKI (Traditional Public Key Infrastructure)

and presents a construction by using the bilinear pairing.In the random oracle model

based on the assumptions of Computational Diffie-Hellman and modifying Inverse Computational Diffie-Hellman

the scheme is proved to satisfy the confidentiality and unforgeability of the insider security.Moreover

it satisfies the properties of ciphertext anonymity which can efficiently protect the privacies of sender and receiver.Owing to the independence and difference of the system parameters in CLPKC and TPKI

the scheme is more suitable in the practical environments.Furthermore

the analysis of efficiency shows that

comparing to the existing heterogeneous signcryption schemes

the scheme is more efficient

so it is suitable for the requirements of identity hiding and constrained bandwidth.