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istio.io/content/en/docs/reference/glossary/trust-domain.md

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Trust Domain

Trust domain corresponds to the trust root of a system and is part of a workload identity

Istio uses a trust domain to create all identities within a mesh. Every mesh has an exclusive trust domain.

For example in spiffe://mytrustdomain.com/ns/default/sa/myname the substring identifying the mesh is: mytrustdomain.com. This substring is the trust domain of the mesh.