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istio.io/content/help/faq/security/use-k8s-secrets.md

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Does Istio authentication use Kubernetes secrets? 120

Yes. The key and certificate distribution in Istio Authentication is based on Kubernetes secrets.

Secrets have known security risks. The Kubernetes team is working on several features to improve Kubernetes secret security, from secret encryption to node-level access control. And as of version 1.6, Kubernetes introduces RBAC authorization, which can provide fine-grained secrets management.