Cryptanalysis of Two Ring Signcryption Schemes

Authors:
Huaqun Wang;Hong Yu
Affiliations:
School of Information Engineering, Dalian Fisheries University, DaLian, China;School of Information Engineering, Dalian Fisheries University, DaLian, China
Venue:
Information Security and Cryptology
Year:
2009

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Abstract

Ring signcryption scheme is an important cryptographic primitive that can be used to protect privacy and authenticity of a collection of users who are connected through an ad-hoc network, such as Bluetooth.In this paper,we analyze two ring signcryption schemes:Wang-Zhang-Ma's scheme (2007) and Zhu-Zhang-Wang's scheme (2008). We give different attack methods to the above two ring signcryption schemes. There exist Malicious KGC attack and Non-repudiation attack on Wang-Zhang-Ma's scheme (2007).There exist anonymity attack and existential unforgeability attack on Zhu-Zhang-Wang's scheme.