Digital Signcryption or How to Achieve Cost(Signature & Encryption)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
Identity Based Proxy-Signcryption Scheme from Pairings
SCC '04 Proceedings of the 2004 IEEE International Conference on Services Computing
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Li and Chen proposed an identity based proxy-signcryption scheme which is based on the Libert and Quisquater's identity based signcryption scheme recently. However, we demonstrate that their scheme does not satisfy the strong unforgeability and forward security in the strict sense. Furthermore, establishing a secure channel has much influence on their scheme. Based on the new ID-based signcryption scheme proposed by Chow et al, an efficient forward secure and public verifiable identity based proxy-signcryption scheme without the secure channel is proposed. The proposed scheme overcomes the weakness of Li-Chen scheme. The security and performance of the scheme are also analyzed.