A Blockchain-Based Digital Identity Management System via Decentralized Anonymous Credentials
Hui Cui, Monica Therese Whitty, Atsuko Miyaji, Zoey Ziyi Li · 2024
In recent years, there has been an increasing trend in data breaches and personal information leakage. Data breaches often occur, in part, because of unintentional human errors. It is, therefore, critical to improve technical solutions to protect personal data. A promising solution to such a global issue is called Decentralized Identity (DID). Different from traditional centralized personal data storage systems, where users have no control over their personal data, individuals in DID management systems have complete control over their personal information. Unfortunately, existing DID solutions fail to achieve full decentralization and meet various needs in real-world applications. For example, previous DID protocols focus on privacy protection without considering that users may need to claim the same credential multiple times in some cases. Due to such an observation, in this paper, we build a blockchain-based digital identity management (BDIdM) system from a Decentralized Anonymous Credential (DAC) scheme, achieving a level of linkability to reuse certain credentials without weakening the security in the DAC scheme.