title: Efficient certificate-based signcryption secure against public key replacement attacks and insider attacks.
abstract: Signcryption is a useful cryptographic primitive that achieves confidentiality and authentication in an efficient manner. As an extension of signcryption in certificate-based cryptography, certificate-based signcryption preserves the merits of certificate-based cryptography and signcryption simultaneously. In this paper, we present an improved security model of certificate-based signcryption that covers both public key replacement attack and insider security. We show that an existing certificate-based signcryption scheme is insecure in our model. We also propose a new certificate-based signcryption scheme that achieves security against both public key replacement attacks and insider attacks. We prove in the random oracle model that the proposed scheme is chosen-ciphertext secure and existentially unforgeable. Performance analysis shows that the proposed scheme outperforms all the previous certificate-based signcryption schemes in the literature.
authors: College of Computer and Information Engineering, Hohai University, No. 8, Focheng Xi Road, Jiangning District, Nanjing, Jiangsu 211100, China.
authors: Yang
authors: 0000-0003-4860-8384
authors: Y
authors: Lu
authors: College of Computer and Information Engineering, Hohai University, No. 8, Focheng Xi Road, Jiangning District, Nanjing, Jiangsu 211100, China.
authors: Jiguo
authors: J
authors: Li
mesh_terms: D022126:Access to Information; D000465:Algorithms; D016494:Computer Security; D003219:Confidentiality; D008962:Models, Theoretical