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The popularization and conveniences of Internet have changed traditional auction transactions into electronic auction via Internet. In 2006, Chang and Chang proposed an anonymous auction that enabled bidders to bid in anonymous cases without any bonds. However, in the initiation phase, the bidder is unable to be anonymous as there is no mechanism to protect his (her) identity. Therefore, the lawless person might take this chance to do something illegal. Once the latter, who participates in thedblp:journals/ijnsec/YangL11 fatcat:gloyex2qm5dxzldrszeg67acre