无可信中心的秘密共享-多重签名方案的密码分析  

Cryptanalysis of Secret-Sharing Multi-Signature Scheme Without Trusted Centre

作　　者：王天银[1] 温巧燕[1] 

机构地区：[1]北京邮电大学网络与交换技术国家重点实验室,北京100876

出　　处：《华南理工大学学报（自然科学版）》2008年第9期52-54,共3页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"863"计划项目(2006AA01Z419);国家自然科学基金重大研究计划项目(90604023);现代通信国家重点实验室基金资助项目(9140C1101010601);北京市自然科学基金资助项目(4072020);河南省教育厅自然科学基础研究项目(2007120007;2008B120005)

摘　　要：首先,对一种新的无可信中心的秘密共享-多重签名方案进行分析,并提出了一种伪造攻击;利用这种攻击,攻击者可以很容易地伪造有效的秘密共享-多重签名,从而证明了该方案是不安全的.然后,对该方案进行了改进,在改进的方案中,参与签名的所有签名者共同决定签名所需的参数,而且达到规定门限个数的签名者共同合作才能生成有效的秘密共享-多重签名.最后,证明了改进后的方案具有更高的安全性,而且可以抵抗文中提出的攻击.In this paper, a new secret-sharing multi-signature scheme without trusted center is analyzed, and a forged attack is given. By using this attack, any attacker can easily forge a valid secret-sharing multi-signature, so that the scheme is not secure. In order to solve this problem, an improved scheme is given, in which all the signers participating in the signing jointly determine the needed signature parameters and only in the case of the signers with the threshold number working together can an effective secret-sharing multi-signature be generated. It is proved that the improved scheme is more secure and effective in resisting the above-mentioned forged attack.

关 键 词：数字签名 秘密共享 多重签名 可信中心 

分 类 号：TN918.1[电子电信—通信与信息系统]