Abstract:

With the development of 5G networks, heterogeneous networks have become the research focus of 5G networks. The heterogeneous signcryption scheme can be used to guarantee the confidentiality and unforgeability in different cryptography. A security analysis for a signcryption scheme in certificateless cryptosystem was firstly provided, and the scheme does not satisfy the unforgeability of signatures, because a malicious KGC can forge a signature. Secondly, to enhance security, a new signcryption scheme was proposed, and extends the new scheme to the heterogeneous network environment under the traditional public key cryptosystem to the certificateless cryptosystem. The new schemes can overcome the security weakness of the original schemes, and can also ensures the security of data transmission between the traditional public key cryptographic and the certificateless cryptographic. In the end, in the random oracle model, based on the computational Diffie-Hellman problem, the unforgeability of the new scheme is proved, and the efficiency analysis shows that the proposed scheme has better communication efficiency and lower computational cost.

Key words: heterogeneous system, signcryption, KGC, unforgeability