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Application & OT Security · Intermediate

Image Signing

Cryptographically signing container images so deployment systems can verify their origin and integrity before running them.

Definition

Tools include Sigstore Cosign and Notary Project (Notation). Signatures are stored in the registry and verified by admission controllers, ensuring only images from trusted pipelines are deployed.

Example

A Kubernetes policy rejects any image not signed by the organization's release key.

Exam tip

Pair signing with admission enforcement; signing alone does nothing if unchecked.

Related terms