Proceedings of the 2008 ACM symposium on Information, computer and communications security
A New Efficient Certificateless Signcryption Scheme
ISISE '08 Proceedings of the 2008 International Symposium on Information Science and Engieering - Volume 01
Strongly secure certificateless public key encryption without pairing
CANS'07 Proceedings of the 6th international conference on Cryptology and network security
Provably secure certificate-based signature scheme without pairings
Information Sciences: an International Journal
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Certificateless cryptography introduced by Al-Riyami and Paterson eliminates the key escrow problem inherent in identity based cryptosystems. Even though building practical identity based signcryption schemes without bilinear pairing are considered to be almost impossible, it will be interesting to explore possibilities of constructing such systems in other settings like certificateless cryptography. Often for practical systems, bilinear pairings are considered to induce computational overhead. Signcryption is a powerful primitive that offers both confidentiality and authenticity to noteworthy messages. Though some prior attempts were made for designing certificateless signcryption schemes, almost all the known ones have security weaknesses. Specifically, in this paper we demonstrate the security weakness of the schemes in [2], [1] and [6]. We also present the first provably secure certificateless signcryption scheme without bilinear pairing and prove it in the random oracle model.