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Publicly Verifiable Secret Sharing Member-join Protocol For Threshold Signatures

Jia Yu1, Fanyu Kong2, Rong Hao1, Xuliang Li3, and Guowen Li4
1. College of Information Engineering, Qingdao University, Qingdao, P. R. China
2. Institute of Network Security, Shandong University, Jinan, P. R. China
3. Network Center, Qingdao University, Qingdao, P. R. China
4. School of Computer Science and Technology, Shandong Jianzhu University, Jinan, P. R. China
Abstract—Publicly verifiable secret sharing (PVSS) allowsnot only shareholders themselves but also everyone verifythe shares of a secret distributed by a dealer. It has a lot ofelectronic applications. In this paper, we propose a publiclyverifiable member-join protocol for threshold signatures. Inour proposal, a new member can join a PVSS scheme toshare the secret only with the help of old shareholders.What’s more, everyone besides the new member can verifythe validity of the new member’s share, while only the newmember knows his share. Different from previous protocols,our protocol can tolerate a mobile adversary. This proposaladapts to many electronic applications. Finally, we analyzethe security of our scheme.

Index Terms—verifiable secret sharing, publicly verifiablesecret sharing, verifiable secret redistribution, verifiableencryption

Cite: Jia Yu, Fanyu Kong, Rong Hao, Xuliang Li, and Guowen Li, "Publicly Verifiable Secret Sharing Member-join Protocol For Threshold Signatures," Journal of Communications, vol. 3, no.7, pp. 36-43, 2008.
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