SD-JWT
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A high‑level, non‑technical look at Self‑Sovereign Identity and the EU Digital Identity Wallet
Embracing Self-Sovereign Identity: A Promising Future for Personal Data Management If you live in the Channel Islands and want your sensitive data kept securely on your own devices, new digital identity tools can help. Self‑sovereign identity (SSI) is a simple idea: you hold your own digital credentials (like an ID card, proof of age, or a qualification) in a secure app and share only what’s needed, with your consent.
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A detailed look into SSI and the current projects including the EU Data Wallet
Navigating the Evolving Landscape of Self-Sovereign Identity: From Failures to Future Promises TL;DR Self-sovereign identity (SSI) is advancing but fragmented: Sovrin’s shutdown in 2025 underscores funding and adoption woes, while standards like AnonCreds (zero-knowledge proofs ZKPs for deep privacy) and SD‑JWT (lightweight web disclosure) compete. Projects like cheqd.io, Dock, and ION drive innovation, but interoperability lags. The EU’s EUDI Wallet, rolling out by 2026 with pilots testing cross-border creds, could unify implementations in one user‑controlled app—enabling seamless, consent‑based data sharing and digital sovereignty.
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A high level look into SSI and the current projects including the EU Data Wallet
Why this post Self-sovereign identity (SSI) and its adjacent ecosystems evolved fast over the last 24 months. This post summarises where the core standards sit, how the European Digital Identity (EUDI) Wallet programme frames the stack, and what’s actually shipping across networks and vendors—using current, primary sources throughout. This post is a bit more technical in nature as implementation gets closer. If you need more details or background please read the deeper dive version of this post.
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Privacy by Design - A look back and a look forward
From X.400 to SMTP: The Story of a Simpler Takeover In the early days of digital communication, there were two competing visions for email. One was the complex, feature-rich, and highly structured X.400 standard, championed by the International Telecommunication Union (ITU). The other was the simpler, more flexible Simple Mail Transfer Protocol (SMTP), which emerged from the internet’s open and collaborative development. Ultimately, SMTP and complementary protocols like PGP (Pretty Good Privacy) prevailed due to their simplicity, adaptability, and the decentralized nature of the internet.
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Privacy by Design & the EU Data Wallet
From X.400 to SD-JWT: A Privacy Evolution in the EU Digital Identity Wallet The landscape of digital identity is constantly evolving, and with the advent of the EU Digital Identity (EUDI) Wallet, we’re seeing a significant leap towards user-centric and privacy-respecting systems. For those of us with a longer history in digital communication, the term “X.400” might ring a bell. While seemingly disparate, comparing the foundational concepts behind X.400 and the modern SD-JWT (Selective Disclosure for JSON Web Tokens) within the context of the EUDI Wallet highlights a remarkable evolution, particularly in how we handle and control personal data.
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Privacy by Design Comes to the fore
Enhancing Privacy and Security in Messaging with SD-JWT In a world where our digital conversations are the new frontier of personal data, the security and privacy of our messaging applications are more critical than ever. We’ve all grown accustomed to end-to-end encryption, which is a great first step, but what happens when you need to share personal information within a conversation? SD-JWT (Selective Disclosure for JSON Web Tokens) offers a powerful solution that can take messaging privacy to a whole new level.
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