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Certificateless signcryption scheme in the standard model
Authors:Zhenhua Liu  Yupu Hu
Affiliation:a Applied Mathematics Department, Xidian University, Xi’an, Shaanxi 710071, China
b Key Laboratory of Computer Networks and Information Security of Ministry of Education, Xidian University, Xi’an, Shaanxi 710071, China
Abstract:Certificateless public key signcryption scheme is an important cryptographic primitive in cryptography. Barbosa and Farshim proposed a certificateless signcryption scheme. However, their construction is proven to be secure in the random oracle model but not the standard model, and the scheme is also vunlerable to the malicious-but-passive key generation center (KGC) attacks. To overcome these disadvantages, we introduce a formal security model for certificateless signcryption schemes secure against the malicious-but-passive KGC attacks and propose a novel certificateless signcryption scheme. The proposed certificateless signcryption scheme is proven to be IND-CCA2 secure under the decisional Bilinear Diffie-Hellman intractability assumption without using the random oracles. The proposed scheme is also proven to be existentially unforgeable under the computational Diffie-Hellman intractability assumptions. Furthermore, performance analysis shows that the proposed scheme is efficient and practical.
Keywords:Certificateless cryptography  Signcryption  Standard model  Bilinear pairings  Provable security
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