Implementation on Partially Verifiable Multi-signature Scheme in Electronic Contract Systems

Abstract

With the rapid development of mobile devices and information technology in recent years, electronic contract systems, by which mutually agreed contracts can be easily and conveniently signed and stored, have steadily advanced. In addition, as the concept of self-sovereign identity has emerged, it is recommended to select and submit only the data an individual wants to prove, out of all data related to the individual, when using data that contains personal information. Although several multi-signature schemes have been proposed, they have limitations such as sequential signing or disclosure of the original data. Thus, in this paper we developed and implemented a Multi-signature scheme, in which only the data to be verified are disclosed and verified. We analyzed the security of the scheme to demonstrate its usability in electronic contract system environments.