Over the past decade, the Self-Sovereign Identity (SSI) model has gained prominence and is expected to become a key element in the authentication and identification processes of European citizens when accessing digital services. Driven by the recent eIDAS 2.0 Regulation, which updates and expands the first eIDAS Regulation by incorporating new concepts and principles aligned with the modern digital landscape, a new framework is being developed to ensure the secure use of digital identity in Europe. This framework places particular emphasis on privacy, user control over personal data, and interoperability across different national systems. This thesis work analyzes both the SSI model, comparing it with previous approaches and highlighting its strengths and challenges, and the innovations introduced by eIDAS 2.0.