CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
Digital Signcryption or How to Achieve Cost(Signature & Encryption)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
On the Security of Joint Signature and Encryption
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
Formal Proofs for the Security of Signcryption
PKC '02 Proceedings of the 5th International Workshop on Practice and Theory in Public Key Cryptosystems: Public Key Cryptography
Versatile padding schemes for joint signature and encryption
Proceedings of the 11th ACM conference on Computer and communications security
Generic Constructions of Identity-Based and Certificateless KEMs
Journal of Cryptology
Proceedings of the 2008 ACM symposium on Information, computer and communications security
Efficient and Provably Secure Certificateless Multi-receiver Signcryption
ProvSec '08 Proceedings of the 2nd International Conference on Provable Security
Certificateless Hybrid Signcryption
ISPEC '09 Proceedings of the 5th International Conference on Information Security Practice and Experience
Two birds one stone: signcryption using RSA
CT-RSA'03 Proceedings of the 2003 RSA conference on The cryptographers' track
Generic certificateless key encapsulation mechanism
ACISP'07 Proceedings of the 12th Australasian conference on Information security and privacy
Efficient and provably-secure identity-based signatures and signcryption from bilinear maps
ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
Hybrid signcryption schemes with insider security
ACISP'05 Proceedings of the 10th Australasian conference on Information Security and Privacy
Improved identity-based signcryption
PKC'05 Proceedings of the 8th international conference on Theory and Practice in Public Key Cryptography
Efficient identity-based encryption without random oracles
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
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Often authentication and confidentiality are required as simultaneous key requirements in many cryptographic applications. The cryptographic primitive called signcryption effectively implements the same and while most of the public key based systems are appropriate for small messages, hybrid encryption (KEM-DEM) provides an efficient and practical way to securely communicate very large messages. The concept of certificateless hybrid signcryption has evolved by combining the ideas of signcryption based on tag-KEM and certificateless cryptography. Recently, Lippold et al. [14] proposed a certificateless KEM in the standard model and the first certificateless hybrid signcryption scheme was proposed by Fagen Li et al. [16]. In this paper, we show that [14] is not Type-I CCA secure and [16] is existentially forgeable. We also propose an improved certificateless hybrid signcryption scheme and formally prove the security of the improved scheme against both adaptive chosen ciphertext attack and existential forgery in the appropriate security model for certificateless hybrid signcryption.