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Process of Assigning a Trust Anchor
Define Federation Policies
Establish the governance model, including roles, responsibilities, and technical requirements.
Define metadata policies, such as signing algorithms, metadata formats, and validation rules.
Create or Select the Trust Anchor Organization
Choose an organization with the authority and capability to act as a trust anchor.
This organization must have a secure infrastructure for managing cryptographic keys and metadata.
Generate Trust Anchor Metadata
Create a signed metadata statement that includes:
Organization details
Public keys
Federation policies
Endpoints for metadata distribution
Distribute Trust Anchor Metadata
Publish the metadata at a well-known URL or through a secure distribution mechanism.
Ensure it is digitally signed using the trust anchor’s private key.
Register the Trust Anchor
Entities (e.g., identity providers, relying parties) configure the trust anchor’s metadata in their systems.
This may involve manual configuration or automated discovery using OpenID Federation protocols.
Validation and Trust Establishment
Participating entities validate the trust anchor’s metadata using its public key.
Once validated, they trust the anchor to vouch for other entities in the federation.
Ongoing Maintenance
Rotate keys periodically.
Update metadata as needed.
Monitor for security incidents or policy violations.
🛠️ Standards and Tools
OpenID Connect Federation 1.0 (draft standard)
JOSE (JSON Object Signing and Encryption)
Tools like pyOIDC, SATOSA, or FedLab can help implement federation logic.