🤖 AI Summary
This work addresses the lack of user-centric integration in existing decentralized identity systems, which obscures the delineation of responsibilities and dependencies among stakeholders concerning security and privacy. To bridge this gap, the paper proposes the first role-oriented, structured architectural model grounded in self-sovereign identity principles. It decomposes complex non-functional requirements into 24 distinct attributes and systematically assigns them across four key roles: data owner, issuer, verifier, and system. By integrating requirements engineering with trust modeling, the approach achieves a coherent alignment between user-centered needs and system design. This unified framework provides both theoretical grounding and architectural support for developing decentralized identity systems that are more secure, transparent, and user-controllable.
📝 Abstract
Centralized identity management systems continuously experience security and privacy challenges, motivating the exploration of Decentralized Identity (DI) and Self-Sovereign Identity (SSI) as user-focused alternatives. Although prior research has consolidated SSI principles and derived quality requirements for DI/SSI systems, it is significantly limited in integrating the user viewpoint. This work addresses this gap by embedding a user perspective into the requirements engineering process for DI/SSI systems. Building on existing SSI principles, composite requirements were decomposed into 24 simple quality or non-functional requirements (NFR). The resulting NFR are systematically mapped to the key actors, namely data owner, issuer, verifier, and system, based on varying degrees of responsibility and ownership. A dependency model is introduced to formalize relationships between actors. Inspired by trust modeling concepts, the model explicitly describes how actors interact and rely on each other for requirements fulfillment. By integrating user-centered requirements, responsibility allocation, ownership specification, and dependency modeling, this work provides the first structured model for DI/SSI system architectures.