On the security of an identity based multi-proxy signature scheme

Authors:
Hu Xiong;Jianbin Hu;Zhong Chen;Fagen Li
Affiliations:
School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, PR China and Chongqing Key Lab of Computer Network and Communication Technology, Chongqing 400065, PR Chi ...;School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, PR China;School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, PR China;School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, PR China
Venue:
Computers and Electrical Engineering
Year:
2011

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Abstract

In a multi-proxy signature scheme, an original signer could authorize a proxy group as his proxy agent. Then only the cooperation of all the signers in the proxy group can generate the proxy signatures on behalf of the original signer. Recently, Cao and Cao gave the first formal definition and security model of an identity-based multi-proxy signature scheme, then proposed an identity-based multi-proxy signature scheme from bilinear pairings and proved its security in their security model. Although they proved that their scheme is secure under this model, we disprove their claim and show that their scheme is not secure. We also present a simple fix to prevent this attack.