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| An Attack and Improve of a Group Signature Scheme Based on Chinese Remainder Theorem |
| Wang Feng-he①②; Hu Yu-pu①; Wang Chun-xiao③ |
| ①Key Lab of Computer Networks and Information Security, Ministry of Education, Xidian University, Xi’an 710071, China; ②Dept. of Mathematics, Taishan Collage., Taian 271000, China |
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Abstract An attack is mounted on a group signature scheme based on Chinese Remainder Theory(Chen-Scheme). It shows the Chen-Scheme is insecure: A colluding subset of group members can find the private key of other members and forge their signatures; The dishonest group center can produce a valid signature on behalf of group members. Using Schnorr signature scheme this paper proposes an improve scheme, which has good characteristics: A colluding subset of group members can not produce a valid signature that the group manager can not open; A dishonest group center can not sign messages on behalf of other members; The revocation of the membership is efficient .
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Received: 08 June 2005
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2007, Vol. 29 
