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

Abstract

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

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

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