关键词: 代理签名, 分布式数字身份, 可验证凭证, 区块链, 撤销

Abstract: With the proliferation of digital services in people’s daily lives, traditional identities have found a new form of expression—digital identities. In conventional network digital activities, the digital identity management is handled by centralized service providers, which brings a series of issues such as difficulties in centralized storage management and insufficient protection of user privacy. Consequently, the identity authentication technology based on decentralized identifier (DID) has become a current research hotspot. However, distributed digital identity authentication schemes often face problems of privacy leakage and cumbersome user signature authentication processes, presenting significant pain points in current distributed identity authentication technology. To address the aforementioned issues, this paper constructs a distributed identity authentication protocol based on revocable proxy signatures, verifiable credentials, and blockchain technology. This protocol achieves a userfriendly and secure signature authentication process, requiring low device performance from users participating in digital activities, making it suitable for a wider range of user digital activities.

Key words: proxy signature, decentralized digital identity, verifiable credential, blockchain, revocation