How to prove yourself: practical solutions to identification and signature problems
Proceedings on Advances in cryptology---CRYPTO '86
On-line/off-line digital signatures
CRYPTO '89 Proceedings on Advances in cryptology
Improved Online/Offline Signature Schemes
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
Identification, Signature and Signcryption Using High Order Residues Modulo an RSA Composite
PKC '01 Proceedings of the 4th International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
Reducing Security Overhead for Mobile Networks
AINA '05 Proceedings of the 19th International Conference on Advanced Information Networking and Applications - Volume 1
Efficient generic on-line/off-line (threshold) signatures without key exposure
Information Sciences: an International Journal
Efficient Generic On-Line/Off-Line Signatures Without Key Exposure
ACNS '07 Proceedings of the 5th international conference on Applied Cryptography and Network Security
Identity-Based Online/Offline Encryption
Financial Cryptography and Data Security
Identity-Based On-Line/Off-Line Signcryption
NPC '08 Proceedings of the 2008 IFIP International Conference on Network and Parallel Computing
Optimal Online/Offline Signature: How to Sign a Message without Online Computation
ProvSec '08 Proceedings of the 2nd International Conference on Provable Security
Divisible On-Line/Off-Line Signatures
CT-RSA '09 Proceedings of the The Cryptographers' Track at the RSA Conference 2009 on Topics in Cryptology
An Efficient Identity-Based Online/Offline Encryption Scheme
ACNS '09 Proceedings of the 7th International Conference on Applied Cryptography and Network Security
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
Improved identity-based signcryption
PKC'05 Proceedings of the 8th international conference on Theory and Practice in Public Key Cryptography
On the key exposure problem in chameleon hashes
SCN'04 Proceedings of the 4th international conference on Security in Communication Networks
A public key cryptosystem and a signature scheme based on discrete logarithms
IEEE Transactions on Information Theory
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An online/offline signcryption scheme provides confidentiality and authentication simultaneously, and it is particularly suitable for the application of resource-constrained systems. In this paper, we present a key-exposure free online/offline signcryption scheme. In contrast, it seems that all the existing online/offline signcryption schemes based on Shamir-Tauman's paradigm suffer from the key exposure problem. In the random oracle model, the proposed scheme is proved to be indistinguishable against adaptive chosen-ciphertext attacks IND-CCA2 and existentially unforgeable against chosen-message attacks EUF-CMA. Besides, an improved scheme is proposed, which requires none of the recipient's public information in the offline phase and hence makes practical sense.