Decentralized Identity Pattern
Also known as: Self-Sovereign Identity (SSI), Decentralized Identifiers (DIDs)
1. Overview
The Decentralized Identity pattern, often associated with the concept of Self-Sovereign Identity (SSI), represents a fundamental shift in how digital identity is managed. Instead of relying on centralized authorities like corporations or governments to issue and control digital identities, this pattern empowers individuals to create, own, and manage their own identities in a secure and verifiable manner. The historical origins of this pattern can be traced back to the limitations of traditional, federated identity models and the rise of distributed ledger technologies (DLT), such as blockchain, which provide the necessary infrastructure for decentralized trust.
2. Core Principles
The Decentralized Identity pattern is built upon a set of core principles that ensure user-centric control and privacy:
| Principle | Description |
|---|---|
| Existence | Users must have an independent existence, not tied to any single organization. |
| Control | Users must be in control of their identities and their data. |
| Access | Users must have access to their own data. |
| Transparency | Systems and algorithms must be transparent. |
| Longevity | Identities should be long-lasting. |
| Portability | Information and services about identity must be transportable. |
| Interoperability | Identities should be as widely usable as possible. |
| Consent | Users must agree to the use of their identity. |
| Minimalization | Disclosure of claims must be minimized. |
| Protection | The rights of users must be protected. |
3. Key Practices
Traditional identity systems are centralized, meaning that a single provider (e.g., Google, Facebook, or a government agency) controls the user’s identity and data. This creates several problems:
- Single Point of Failure: If the central provider is compromised, all user data is at risk.
- Data Silos: User data is locked into specific platforms, making it difficult to move between services.
- Lack of Control: Users have little control over how their data is used and shared.
- Exclusion: Individuals without access to traditional identity documents may be excluded from digital services.
4. Implementation
The Decentralized Identity pattern addresses these problems by creating a trust model based on three key components:
- Decentralized Identifiers (DIDs): Globally unique identifiers that are created and controlled by the user. DIDs are not tied to any central authority and can be registered on a distributed ledger.
- Verifiable Credentials (VCs): Tamper-proof digital credentials that can be issued by any entity and verified by any other entity. VCs allow users to prove specific claims about themselves (e.g., “I am over 18”) without revealing unnecessary personal information.
- The Trust Triangle: A model that describes the interactions between the three main actors in a decentralized identity ecosystem: the issuer (who issues the VC), the holder (who holds the VC), and the verifier (who verifies the VC).
5. 7 Pillars Assessment
| Pillar | Score (1-5) | Rationale |
|---|---|---|
| Purpose | 3 | Serves a clear technical purpose in system design |
| Governance | 3 | Can be governed through standard engineering practices |
| Culture | 3 | Supports engineering culture of reliability and quality |
| Incentives | 3 | Aligns incentives toward system stability |
| Knowledge | 4 | Well-documented pattern with extensive community knowledge |
| Technology | 4 | Directly applicable to modern technology stacks |
| Resilience | 4 | Contributes to overall system resilience |
| Overall | 3.4 | A valuable technical pattern that supports commons infrastructure |
While the Decentralized Identity pattern offers significant advantages, there are also trade-offs and considerations to keep in mind:
| Pros | Cons |
|---|---|
| Enhanced user privacy and control | Complexity of implementation and user experience |
| Increased security and resilience | Lack of established standards and interoperability challenges |
| Reduced reliance on central authorities | Potential for new forms of exclusion if not designed inclusively |
| Greater portability of identity and data | Governance and key management challenges |
6. When to Use
The Decentralized Identity pattern is being explored and implemented in a variety of contexts:
- Digital Wallets: Mobile applications that allow users to store and manage their DIDs and VCs.
- Verifiable Credentials for Education: Universities can issue VCs for degrees and certificates, allowing students to easily share their qualifications with potential employers.
- Healthcare: Patients can use decentralized identity to control access to their medical records.
- Financial Services: Decentralized identity can be used to streamline Know Your Customer (KYC) processes and reduce fraud.
7. Anti-Patterns & Gotchas
In the age of AI and machine learning, the Decentralized Identity pattern becomes even more critical. As AI systems become more autonomous, they will need to be able to trust the data they are using. Decentralized identity can provide a secure and verifiable way to establish trust in data provenance and integrity, which is essential for building reliable and ethical AI systems.
8. References
The Decentralized Identity pattern aligns well with the principles of the Commons:
- Shared Resource: Decentralized identity infrastructure can be seen as a shared resource that is open and accessible to all.
- Democratic Governance: The governance of decentralized identity systems can be designed to be democratic and community-driven.
- Equitable Access: By reducing reliance on traditional identity documents, decentralized identity can promote more equitable access to digital services.
- Sustainability: Decentralized identity systems can be designed to be sustainable and resilient.
- Community Benefit: The primary goal of decentralized identity is to benefit the community by empowering individuals and promoting trust in the digital world.
References
[1] Microsoft. (2022). Decentralized Identity: The Basics of Decentralized Identity. https://techcommunity.microsoft.com/blog/microsoft-security-blog/decentralized-identity-the-basics-of-decentralized-identity/3071980 [2] W3C. (2022). Decentralized Identifiers (DIDs) v1.0. https://www.w3.org/TR/did-core/ [3] KuppingerCole. (n.d.). Beginner’s Guide to Decentralized Identity. https://www.kuppingercole.com/insights/decentralized-identity/decentralized-identity-guide