Cryptology ePrint Archive: Report 2004/244

Signcryption in Hierarchical Identity Based Cryptosystem

Sherman S.M. Chow and Tsz Hon Yuen and Lucas C.K. Hui and S.M. Yiu

Abstract: In many situations we want to enjoy confidentiality, authenticity and non-repudiation of message simultaneously. One approach to achieve this objective is to "sign-then-encrypt" the message, or we can employ special cryptographic scheme like signcryption. Two open problems about identity-based (ID-based) signcryption were proposed in \cite{CryptoePrint:2003:023}. The first one is to devise an efficient forward-secure signcryption scheme with public verifiability and public ciphertext authenticity, which is promptly closed by \cite{LNCS2971:ICISC2003:CYHC}. Another one which still remains open is to devise a hierarchical ID-based signcryption scheme that allows the user to receive signcrypted messages from sender who is under another sub-tree of the hierarchy. This paper aims at solving this problem by proposing two concrete constructions of hierarchical ID-based signcryption.

Category / Keywords: public-key cryptography / ID-based cryptography, Signcryption, Hierarchical ID-based Cryptosystem, Bilinear pairings

Publication Info: To appear in Security and Privacy in the Age of Ubiquitous Computing, IFIP TC11 20th International Conference on Information Security (SEC 2005), May 30 - June 1, 2005, Chiba, Japan.

Date: received 21 Sep 2004, last revised 15 Feb 2005

Contact author: smchow at cs hku hk

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Version: 20050215:152312 (All versions of this report)

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