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| Colluding attacks on a group signature scheme |
| GUO Xing-yang, TANG Chao-jing |
| School of Electronic Science and Engineering, National University of Defense Technology, Hunan 410073, China; School of Telecommunication Engineering, Air Force Engineering University, Xi’an 710077, China |
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Abstract Xie and Yu (2005) proposed a group signature scheme and claimed that it is the most efficient group signature scheme so far and secure. In this paper, we show that two dishonest group members can collude to launch two attacks on the scheme. In the first attack they can derive the group secret key and then generate untraceable group signatures. In the second attack, they can impersonate other group members once they see their signatures. Therefore we conclude that the signature scheme is not secure. We show that some parameters should be carefully selected in the scheme to resist our attacks.
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Received: 10 June 2005
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