A decentralized group signature scheme for privacy protection in a blockchain

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.

Trusted and Secure Blockchain-Based Durable Medium Electronic Service

“…The decentralized group signature scheme (DGSS) is considered in [15]. The idea is based on blockchain technology, while the user identity privacy is secured by the discrete logarithm concept.…”

“…Currently, a blockchain is one of the best solutions to store key data in safe structures that cannot be interfered with or changed. Therefore, it is successfully used in cryptocurrencies and other business applications [15]. Let us now describe the proposed idea in more detail.…”

Implications of the arithmetic ratio of prime numbers for RSA security

“…Nowadays, many new approaches aim to improve digital signature algorithms and signing schemes. One of these new ways is the group signature scheme in the blockchain (Devidas et al, 2021).…”