摘要： 利用群签名体制给出一个可撤消投标者的安全的网上招投标方案。该方案实现了参与竞标公司身份的匿名性、中标者的不可否认性、可公开验证性等安全性问题。该文解决了群签名中成员删除问题。即当竞标公司因为某些原因被撤消其资格时,可信权威人士只需更改群公钥的一个参数,并用其他竞标公司的公钥加密后广播出去。而无须更改其他竞标公司的数字证书,使接下来的竞标过程顺利进行,同时保证了被撤消的竞标公司的身份与它以前参与竞标的项目的不可联系性。

关键词: 网上招投标, 群签名, 知识签名, 成员删除

Abstract: This paper utilizes a group signature scheme to propose a secure scheme of bidding and tendering on Internet with revocation of bidder. This scheme realizes the anonymity of identity of bidders, unforgeability and public verifiability of successful bidders, etc. The paper resolves the problem of member deletion in group signatures. When a bidder is withdrawn, an authority only needs to modify a parameter of public key, and broadcasts it encrypted by the public key of another bidder. They needn’t to modify the digital certifications of other bidders, and can ensure the unlinkability of identity of the withdrawn bidders to the former items of tendering.

中图分类号: 

• TP393.09