Aggregating Digital Identities through Bridging. An Integration of Open Authentication Protocols for Web3 Identifiers
Ben Biedermann, Matthew Scerri, Victoria Kozlova, Joshua, Ellul

TL;DR
This paper proposes a privacy-preserving digital identity bridge integrating Web2 and Web3 authentication protocols to reduce fragmentation and improve user experience, while discussing inherent limitations and trust issues.
Contribution
It introduces a novel digital identity bridge that connects Web2 and Web3 protocols, addressing interoperability and privacy concerns in decentralized digital identities.
Findings
The bridge can mitigate identity fragmentation across platforms.
It demonstrates improved user experience through identity aggregation.
The approach highlights limitations related to trust and centralisation in the bridging process.
Abstract
Web3's decentralised infrastructure has upended the standardised approach to digital identity established by protocols like OpenID Connect. Web2 and Web3 currently operate in silos, with Web2 leveraging selective disclosure JSON web tokens (SD-JWTs) and Web3 dApps being reliant on on-chain data and sometimes clinging to centralised system data. This fragmentation hinders user experience and the interconnectedness of the digital world. This paper explores the integration of Web3 within the OpenID Connect framework, scrutinising established authentication protocols for their adaptability to decentralised identities. The research examines the interplay between OpenID Connect and decentralised identity concepts, the limitations of existing protocols like OpenID Connect for verifiable credential issuance, OpenID Connect framework for verifiable presentations, and self-issued OpenID provider.…
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Taxonomy
TopicsDigital Rights Management and Security · Access Control and Trust
