Matrix Identity System

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Subtitle:

User identification and third-party ID association framework in Matrix

Core Idea:

The Matrix Identity System manages user identities by providing unique Matrix IDs and allowing users to link third-party identifiers (3PIDs) like email addresses and phone numbers through federated identity servers.

Key Principles:

1. Unique User IDs:
   • Every Matrix user has a unique identifier in the format @localpart:domain tied to their homeserver.
2. Third-Party ID Linking:
   • Users can associate external identifiers like email addresses and phone numbers to their Matrix accounts.
3. Federated Identity Verification:
   • A network of trusted identity servers verifies ownership of 3PIDs and maintains mappings between 3PIDs and Matrix IDs.

Why It Matters:

• Discovery:
  • Users can find contacts on Matrix by searching for their email addresses or phone numbers.
• Authentication Flexibility:
  • Multiple authentication methods can be used beyond Matrix-specific credentials.
• Identity Portability:
  • Users can maintain consistent identity while changing homeservers.

How to Implement:

1. Identity Server Selection:
   • Connect to trusted identity servers in the Matrix ecosystem.
2. 3PID Verification:
   • Validate ownership of third-party IDs through confirmation codes sent via email, SMS, etc.
3. Binding Publication:
   • Publish verified mappings between 3PIDs and Matrix user IDs to identity servers.

Example:

• Scenario:
  • A new Matrix user wants to find existing contacts who already use Matrix.
• Application:
  • The user authorizes their Matrix client to look up their address book contacts on identity servers.
• Result:
  • The client displays which contacts have Matrix accounts, allowing the user to connect with them immediately.

Connections:

• Related Concepts:
  • Matrix Protocol: The broader communication protocol that uses this identity system
  • User and Device Management in Matrix: How users and their devices are managed in Matrix
• Broader Concepts:
  • Federated Identity: General approaches to identity across distributed systems
  • Decentralized Identifiers (DIDs): W3C standard for decentralized identifiers

References:

1. Primary Source:
   • Matrix Specification: Identity Service API
2. Additional Resources:
   • Matrix Identity Service documentation
   • Matrix 3PID association documentation

Tags:

#matrix #identity #federation #3pid #authentication #discovery

Connections:

Sources:

• From: Matrix Specification