Container image signing is the cryptographic signing of container images so verifiers can confirm authenticity and detect tampering. It matters because unsigned images are easier to spoof, replace, or distribute without strong authenticity checks.
What is Container Image Signing?
Signing helps admission policies and deployment systems reject unknown or altered images. Its real value depends on key protection, verification enforcement, and clean linkage to trusted build and registry workflows.
What Container Image Signing Commonly Supports
Common uses include admission control, deployment policy, supply chain security, and image trust validation.
Container Image Signing vs. Unsigned Image Deployment
Container image signing enables authenticity verification before runtime. Unsigned deployment relies much more on registry and naming trust alone.
Frequently Asked Questions
Why sign container images?
Because deployment systems need a reliable way to distinguish trusted images from altered or unapproved ones.
Does signing guarantee the image is safe?
No. A signed image can still be vulnerable or malicious if the signer or build pipeline was compromised.
