Certificate-based signcryption with enhanced security features

Authors:
Jiguo Li;Xinyi Huang;Meixue Hong;Yichen Zhang
Affiliations:
College of Computer & Information Engineering, Hohai University, Nanjing 210098, China;Institute for Infocomm Research (I2R), Singapore;College of Computer & Information Engineering, Hohai University, Nanjing 210098, China;College of Computer & Information Engineering, Hohai University, Nanjing 210098, China
Venue:
Computers & Mathematics with Applications
Year:
2012

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Abstract

Certificate-based cryptography overcomes the inherent shortcomings in traditional public key cryptography and identity-based cryptography. It provides effective mechanisms to design efficient public key cryptography systems with less reliance on underlying infrastructure. As a classic primitive in public key cryptography, signcryption performs signature and encryption in a single logical step, by integrating confidentiality, integrity, authentication and non-repudiation much more efficiently than the traditional sign-then-encrypt approach. In this paper, we first define an enhanced security model for certificate-based signcryption. We then analyze an existing certificate-based signcryption scheme, and show that it is insecure due to two classic attacks. Furthermore, we propose a new certificate-based signcryption scheme. Our scheme is proven secure against adaptive chosen ciphertext attacks and adaptive chosen message attacks in the random oracle model.