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Paper details
Number 2 - June 2021
Volume 31 - 2021
A decentralized group signature scheme for privacy protection in a blockchain
S. Devidas, Subba Rao Y.V., N. Rukma Rekha
Abstract
Group signature schemes play a vital role in protecting identity privacy of a member of a group who signs a message using
the group signature. However, in the existing group signature schemes the centralized group manager has control over all
the participants, and these managers can be malicious. They may take a biased decision when there is a dispute among
the group members or while revealing the identity of a group member. To overcome the trust issues related to centralized
group managers and to improve user privacy, a decentralized group signature scheme (DGSS) is proposed by decentralizing
the role of the group manager. The proposed scheme will be more suitable for decentralized environments like a
blockchain. Security analysis along with the proof of correctness is also provided for the proposed scheme. A framework
for a blockchain-based e-auction protocol using the DGSS is also proposed in this paper.
Keywords
blockchain, decentralization, e-auction, group signature, privacy, smart contract