On the security of some multi-PKG/multi-recipient signcryption schemes

Authors:
Jianhong Zhang;Jiancheng Zou
Affiliations:
College of Sciences, North China University of Technology, Beijing, China;College of Sciences, North China University of Technology, Beijing, China
Venue:
ASID'09 Proceedings of the 3rd international conference on Anti-Counterfeiting, security, and identification in communication
Year:
2009

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Abstract

Signcryption is an asymmetric cryptographic method that provides simultaneously both message confidentiality and unforgeability at a low computational and communication overhead. Indistinguishability and unforgeability are two primitive properties of a secure signcryption. Recently, to satisfy the security requirements of Ad hoc networks, Li et.al proposed two Multi-PKG ID-based signcryption schemes in ANCS2007 and Inscrypt2008, respectively. To satisfy the security requirements of multi-user setting, Li et.al also proposed a multirecipient signcryption scheme. In this work, we analyze the security of three signcryption schemes and show that the two Multi-PKG ID-based signcryption schemes are insecure against chosen ciphertext attacks and the multi-recipient signcryption scheme is insecure against chosen message attacks. And we discuss the reason of producing such attacks and the corresponding revised methods for each scheme.