✦ LIBER ✦

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

✍ Scribed by Hu Xiong; Jianbin Hu; Zhong Chen; Fagen Li

Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 208 KB
Volume: 37
Category: Article
ISSN: 0045-7906
DOI: 10.1016/j.compeleceng.2011.01.006

No coin nor oath required. For personal study only.

✦ Synopsis

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.

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