Digital Signcryption or How to Achieve Cost(Signature & Encryption)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on 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
On the Security of Signcryption Scheme with Key Privacy
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Improved signcryption from q-Diffie-Hellman problems
SCN'04 Proceedings of the 4th international conference on Security in Communication Networks
Analysis and improvement of a signcryption scheme with key privacy
ISC'05 Proceedings of the 8th international conference on Information Security
Efficient Secret Authenticatable Anonymous Signcryption Scheme with Identity Privacy
PAISI, PACCF and SOCO '08 Proceedings of the IEEE ISI 2008 PAISI, PACCF, and SOCO international workshops on Intelligence and Security Informatics
Signcryption Scheme in Multi-user Setting without Random Oracles
IWSEC '08 Proceedings of the 3rd International Workshop on Security: Advances in Information and Computer Security
Forgery of Provable Secure Short Signcryption Scheme
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
On the Security of Provably Secure Multi-Receiver ID-Based Signcryption Scheme
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Efficient Constructions of Signcryption Schemes and Signcryption Composability
INDOCRYPT '09 Proceedings of the 10th International Conference on Cryptology in India: Progress in Cryptology
Analysis and improvement of an ID-based anonymous signcryption model
ICIC'09 Proceedings of the 5th international conference on Emerging intelligent computing technology and applications
An efficient signcryption scheme with key privacy and its extension to ring signcryption
Journal of Computer Security - The 2007 European PKI Workshop: Theory and Practice (EuroPKI'07)
Distributed signcryption from pairings
ICISS'11 Proceedings of the 7th international conference on Information Systems Security
An efficient signcryption scheme with key privacy
EuroPKI'07 Proceedings of the 4th European conference on Public Key Infrastructure: theory and practice
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In this paper, we analyse the Yang-Wong-Deng signcryption scheme [G. Yang, D.S. Wong, X. Deng, Analysis and improvement of a signcryption scheme with key privacy, in: Information Security Conference--ISC'05, in: Lecture Notes in Comput. Sci., vol. 3650, Springer-Verlag, Berlin, 2005, pp. 218-232] proposed in ISC'05, which is the improvement and enhancement of the security of Libert-Quisquater signcryption scheme [B. Libert, J.J. Quisquater, Efficient signcryption with key privacy from gap Diffie-Hellman groups, in: Public Key Cryptography--PKC'04, in: Lecture Notes in Comput. Sci., vol. 2947, Springer-Verlag, Berlin, 2004, pp. 187-200]. Although Yang et al. [G. Yang, D.S. Wong, X. Deng, Analysis and improvement of a signcryption scheme with key privacy, in: Information Security Conference--ISC'05, in: Lecture Notes in Comput. Sci., vol. 3650, Springer-Verlag, Berlin, 2005, pp. 218-232] proved that their scheme is secure against adaptive chosen ciphertext attacks and achieves ciphertext anonymity (which is also called key privacy) in the random oracle model; we disprove all their claims and show that their scheme is not semantically secure and does not achieve ciphertext anonymity.