Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
New Signcryption Schemes Based on KCDSA
ICISC '01 Proceedings of the 4th International Conference Seoul on Information Security and Cryptology
Digital Signcryption or How to Achieve Cost(Signature & Encryption)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
INDOCRYPT '00 Proceedings of the First International Conference on Progress in Cryptology
A Signcryption Scheme Based on Integer Factorization
ISW '00 Proceedings of the Third International Workshop on Information Security
A Signcryption Scheme with Signature Directly Verifiable by Public Key
PKC '98 Proceedings of the First International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
Encrypted Message Authentication by Firewalls
PKC '99 Proceedings of the Second International Workshop on Practice and Theory in Public Key Cryptography
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
ECDSA-Verifiable Signcryption Scheme with Signature Verification on the Signcrypted Message
Information Security and Cryptology
Parallel authentication and public-key encryption
ACISP'03 Proceedings of the 8th Australasian conference on Information security and privacy
New DSA-verifiable signcryption schemes
ICISC'02 Proceedings of the 5th international conference on Information security and cryptology
Analysis and improvement of a signcryption scheme with key privacy
ISC'05 Proceedings of the 8th international conference on Information Security
Efficient identity-based signcryption in the standard model
ProvSec'11 Proceedings of the 5th international conference on Provable security
A generic construction of accountable decryption and its applications
ACISP'12 Proceedings of the 17th Australasian conference on Information Security and Privacy
Generic constructions for verifiable signcryption
ICISC'11 Proceedings of the 14th international conference on Information Security and Cryptology
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Signcryption as a cryptographic primitive that offers both confidentiality and authentication simultaneously. Generally, in signcryption schemes, the message is hidden and thus the validity of the signcryption can be verified only after the unsigncryption process. Thus, a third party will not be able to verify whether the signcryption is valid or not. Signcryption schemes that allow any one to verify the validity of signcryption without the knowledge of the message are called public verifiable signcryption schemes. Third party verifiable signcryption schemes allow the receiver of a signcryption, to convince a third party that the signcryption is valid, by providing some additional information along with the signcryption. This information can be anything other than the receiver's private key and the verification may or may not require the exposure of the corresponding message. This paper shows the security weaknesses in two such existing schemes namely [14] and [4]. The scheme in [14] is Public Key Infrastructure (PKI) based scheme and the scheme in [4] is an identity based scheme. More specifically, [14] is based on elliptic curve digital signature algorithm (ECDSA). We also, provide a new identity based signcryption scheme that provides both public verifiability and third party verification. We formally prove the security of the newly proposed scheme in the random oracle model.