Efficient Certificate-Based Signcryption Secure against Public Key Replacement Attacks and Insider Attacks

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 simultan...

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Bibliographic Details
Published in:TheScientificWorld 2014-01, Vol.2014 (2014), p.1-12
Main Authors: Lu, Yang, Li, Jiguo
Format: Article
Language:English
Subjects:
Access to Information
Algorithms
Analysis
Computer Security
Confidentiality
Cryptography
Cybersecurity
Data encryption
Models, Theoretical
Network security
Public key encryption
Public Key Infrastructure
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Summary: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.
ISSN:2356-6140
1537-744X
1537-744X
DOI:10.1155/2014/295419