满足便携文档格式的公平多方合同签署协议

doi:10.3969/j.issn.1001-2400.2018.01.021

西安电子科技大学学报

满足便携文档格式的公平多方合同签署协议

张永强1;刘佳南2;田海博2

(1. 数安时代科技股份有限公司, 广东广州 510000；
2. 中山大学数据科学与计算机学院, 广东广州 510006)

收稿日期:2017-01-22 出版日期:2018-02-20 发布日期:2018-03-23
作者简介:张永强(1977-)，男，高级工程师，博士，E-mail: zhangyq@gdca.com.cn
基金资助:
广东省自然科学基金资助项目(2015A030313133)

ZHANG Yongqiang1;LIU Jia'nan2;TIAN Haibo2

(1. Global Digital Cybersecurity Authority Co., Ltd., Guangzhou 510000, China;
2.School of Data and Computer Science, Sun Yat-sen Univ., Guangzhou 510006, China)

Received:2017-01-22 Online:2018-02-20 Published:2018-03-23

摘要/Abstract

摘要：

当前，便携文档格式中的多个数字签名与公平多方合同签署协议所交换的多个数字签名存在签署内容不一致的问题．文中尝试解决这一实际问题，构造以便携文档格式文件为载体的公平多方合同签署协议．采用了分布式的哈希计算方法，使得多个参与方可以在隐藏各自秘密的情况下，完成对一个共同消息的哈希;并采用传统的可验证加密签名技术，保障公平性，减少交互次数．最终获得了每次合同签署只需要与可信第三方交互一次的公平多方合同签署协议，并给出了该协议实际的性能参数．根据文中的结果，可以在实际应用中以便携文档格式文件为载体，多个参与方公平地签署一份文档，并通过普通的便携文档格式阅读器完成验证．

关键词: 多方合同签署协议, 便携文档格式, 实际应用, 公平性, 数字签名

Abstract:

Currently, there is an inconsistent problem about the content to be signed by multiple signatures that are exchanged in a fair multi-party contract signing protocol (FMCSP) and by those following the portable document format(PDF). This paper tries to solve the practical problem by constructing an FMCSP based on PDF files. It proposes a distributed method to compute hash values so that multiple parties could compute a hash value of a common message while they hide their secrets in the message respectively. It adopts the traditional verifiable encrypted signature technology to guarantee the fairness and reduce the interaction rounds. Finally, it obtains an FMCSP where only one interaction is needed to sign a contract, and gives practical performance parameters. According to the work, one could use a PDF file to fairly sign a document among multiple parties in practical applications, and the final signed PDF file could be verified by a common PDF reader.

Key words: multi-party contract signing protocol, portable document format, practical applications, fairness, digital signatures

张永强;刘佳南;田海博. 满足便携文档格式的公平多方合同签署协议[J]. 西安电子科技大学学报, 2018, 45(1): 117-122.

ZHANG Yongqiang;LIU Jia'nan;TIAN Haibo. [J]. Journal of Xidian University, 2018, 45(1): 117-122.

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