Use all three controls for different questions: a digest identifies the exact image content, a signature authenticates a claim about that content and its signer, and a software bill of materials (SBOM) describes what software is inside it. A digest can tell you whether the bytes you pulled match an expected image, but not who built them. A signature can establish that a trusted identity made a claim, but not that the code is safe. An SBOM can list components and licenses, but does not prove the image was signed or approved.
The practical deployment pattern is to resolve a human-readable tag to a platform-specific digest, deploy by digest, verify signatures under an explicit trust policy, and retain an SBOM whose subject and scope are clear. Docker Content Trust is not a future-proof default: Docker documents that it is being retired and that Notary v1 at notary.docker.io is scheduled to shut down on December 8, 2026.
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What each control answers
Container security evidence is easier to use when each artifact has one job. The three terms are related because they can all be attached to an OCI image, but they answer different questions.
| Control | Question answered | Evidence checked | What it does not prove |
|---|---|---|---|
| Digest | Did I retrieve the exact content identified by this reference? | A cryptographic hash of referenced bytes, using a named algorithm | Who produced the content, whether it was approved, or whether it is vulnerability-free |
| Signature | Did an identity authenticate a claim about this image, and do I trust that identity for this purpose? | A signed statement, the signer identity, and a policy that validates the signature and certificate or key | That the image is safe, current, or free of malicious or vulnerable code |
| SBOM | What software components, metadata, and relationships are present? | A structured inventory, such as SPDX, with a stated subject and scope | That the image was signed, approved, or free of vulnerabilities |
These controls complement one another. A deployment decision can require all three: the digest must match the release record, the signature must satisfy the organization’s signer policy, and the SBOM must be available for vulnerability, licensing, and incident-response work.
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How an image digest identifies content
An OCI image descriptor contains a media type, a byte size, and a digest. The digest is a hash of the referenced bytes using a named algorithm; OCI guidance says consumers should verify content against the digest before consuming it from an untrusted source. See the OCI Image Specification’s descriptor and digest guidance.
For a registry reference such as registry.example/app:release, the tag is a mutable name. A publisher can rebuild the image and move that tag to a new manifest. A digest reference, such as registry.example/app@sha256:…, names one content identifier. If the bytes retrieved do not hash to that value, the client should reject them.
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What is actually hashed?
An image is not one flat file. A manifest references a configuration object and filesystem layers. Each referenced object has its own digest, while the manifest has a digest that covers the manifest bytes and therefore the references it contains. An image index can reference several manifests, commonly one per operating-system and CPU platform. The OCI specification describes these image and index relationships in its image specification.
This distinction matters when a tag points to a multi-platform index. A Linux/amd64 node and a Linux/arm64 node can select different child manifests under the same tag. Pinning the index digest preserves the exact index, but your runtime still selects a platform-specific manifest from that index. For high-assurance deployment, record the platform and verify the selected manifest digest, not only the friendly tag.
Why a digest is not an identity claim
A digest proves correspondence between retrieved bytes and an expected hash. It does not say who created those bytes. Anyone who can publish an image can publish a different image with a different digest. The security of digest pinning therefore depends on how the expected digest reached your deployment system: a protected release record, an authenticated registry response, a reviewed configuration change, or another channel your organization trusts.
Tags, digests, and platform selection in a deployment
Tags are useful for discovery and human communication: 1.8.4, stable, or production are easier to read than a 64-character hash. They are poor alone as an audit record because they can move. Docker’s documentation also notes that signed and unsigned content associated with a tag can diverge under Docker Content Trust.
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A safe resolution workflow
- Resolve the release tag. Pull the image from the intended registry while recording the returned digest and the target platform.
- Review the manifest. Confirm that the selected operating system, architecture, configuration, and layer set are the release you approved.
- Pin the deployment. Put the digest reference in the deployment manifest, lock file, or equivalent release record. Keep the original tag as explanatory metadata, not as the sole selector.
- Check at admission and runtime. Ensure the orchestrator or registry policy rejects an image whose digest is not on the approved list. At runtime, inspect the image identity actually running on each node.
- Record platform context. For a multi-platform image, retain the index digest, selected child-manifest digest, platform, registry, and retrieval time.
For a local Docker Engine check, commands such as docker image inspect can show repository digests associated with a pulled image. The exact output depends on the registry and client version, so treat the registry’s manifest response and your deployment system’s recorded digest as the authoritative release evidence.
What a container signature adds
A signature is a cryptographic authentication of a claim tied to image content and a signer identity. The claim might say that a build system produced the image, that a release team approved it, or that a particular workflow attested to a property. Verification is meaningful only when the consumer checks the signature under an intended trust policy: which identities are allowed, which issuer or key is trusted, which repository and environment are in scope, and which claim types are required.
Identity and policy are inseparable
A mathematically valid signature is not automatically an authorization. A signature made by an unknown key may be authentic but irrelevant to your deployment. Conversely, a trusted signer may have been compromised or may have signed an image before a review gate. Define policy in terms of identity and context, for example: “accept only images in this repository signed by the production build identity from the approved issuer, and require a successful release attestation.” Store the policy with the deployment controls so that verification is repeatable.
Signing does not certify safety
Signing proves that the signer authenticated a statement; it does not prove that the image contains no exploitable dependency, malicious script, leaked secret, or configuration error. Vulnerability scanning, code review, reproducible-build controls, runtime hardening, and incident response remain separate safeguards. A signature should increase confidence in provenance and authorization, not replace security testing.
Docker Content Trust’s status and the 2026 deadline
Docker’s official documentation states, “Docker Content Trust (DCT) is being retired.” The same page says that Notary v1 at notary.docker.io will shut down on December 8, 2026: Docker Docs: Content trust in Docker.
DCT’s older workflow associates trust data with tags. That model does not make a tag permanently immutable, and Docker documents that signed and unsigned content associated with a tag can diverge. Do not design a new long-lived deployment process around the legacy docker trust workflow without confirming your registry’s migration plan and support dates.
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What to do if you use DCT today
- Inventory repositories, clients, CI jobs, and admission controls that depend on Notary v1 or
docker trust. - Identify the signing identities, keys, delegation roles, and renewal procedures currently in use.
- Ask your registry provider which successor signing and attestation workflows it supports, including how signatures are stored and verified.
- During migration, continue recording immutable digests so a control-plane change does not silently change the deployed bytes.
- Test failure behavior: an unsigned image, an image signed by the wrong identity, an expired certificate, and an index containing an unexpected platform manifest should all produce a clear rejection or escalation.
There is no single universal replacement established by the material available here. The right successor depends on your registry, identity provider, build platform, and deployment admission system.
What an SBOM contains—and what “scope” means
An SBOM is a structured inventory or description of software components. SPDX 3.0.1 defines an SBOM as a collection of SPDX elements describing a package and potentially its composition, provenance, licensing, and known quality or security information; the specification is available in the SPDX 3.0.1 document.
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Check the subject, format, and coverage
Before relying on an SBOM, establish three facts:
- Subject: Is it attached to an image manifest, an image index, a configuration object, a layer, or another artifact?
- Format: Is it SPDX, CycloneDX, or another machine-readable format, and can your tooling parse the version used?
- Scope: Does it cover the complete image, one layer, a filesystem path, or only build-time dependencies?
SBOM attachment specifications allow an SBOM to describe an image or a narrower image part. The Cosign SBOM specification also notes multiple formats and scopes, and its older attachment approach says attachment support is deprecated in favor of attestations. Treat the subject digest and scope as mandatory metadata; an SBOM without them can be impossible to match confidently to a running image.
Build-time generation and retention
Docker Build documents SBOM attestations that can be generated as part of a build: Docker Docs: SBOM attestations. Generate the SBOM from the same build that produces the image, store it in a registry or artifact store that preserves its relationship to the image, and retain a copy with the release record. Keep the image digest, SBOM digest, format, generator version, and scope together so an incident responder can retrieve the exact artifact later.
How the three controls fit into one release pipeline
- Build. Produce the image from reviewed source and a controlled build definition. Generate an SBOM attestation during or immediately after the build, recording its format and scope.
- Resolve. Publish the image and obtain the manifest or index digest. Determine the platform-specific child manifest that each supported deployment target will select.
- Sign. Have the designated build or release identity sign the image digest and, where applicable, sign attestations such as the SBOM. Keep signing and SBOM generation as separate evidence-producing steps.
- Verify before release. Check that downloaded content hashes to the expected digest, that the signature satisfies the repository and identity policy, and that the SBOM subject matches the image being released.
- Pin and admit. Deploy the digest reference. Configure admission controls to reject unapproved digests, missing or invalid signatures, and attestations that do not match the selected platform manifest or required scope.
- Monitor and respond. When a vulnerability, revoked signer, or compromised build is discovered, use the digest-to-SBOM relationship to identify affected releases, then revoke or block the digest through the deployment policy.
This separation prevents a common failure: treating one artifact as if it proves all three properties. The digest provides reproducible content identity; the signature supplies authenticated provenance or approval; the SBOM supplies component visibility.
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Common failure modes and fixes
“We deploy :latest, so everyone gets the same image.”
A tag can move between deployments. Fix the release record to a digest and make tag resolution a deliberate, reviewable step.
“The digest is pinned, so the publisher is trusted.”
A digest has no inherent publisher identity. Obtain it through a trusted channel and require a signature whose identity and scope match your policy.
“The signature is valid, so the image is secure.”
Validity only means the signed claim verifies under the selected trust rules. Review the claim, signer, build controls, vulnerability results, and runtime configuration separately.
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It may cover one layer, path, or dependency class. Inspect the attestation subject, format, and stated scope before using it for compliance or incident response.
“The index digest is enough for every machine.”
A multi-platform index can lead different nodes to different child manifests. Record and enforce the platform-specific manifest where your policy requires exact bytes.
“Docker Content Trust will keep working indefinitely.”
Docker documents the Notary v1 shutdown for December 8, 2026. Inventory dependencies now and validate your registry’s supported migration path instead of assuming the legacy workflow is a permanent control.
A practical verification checklist
- Is the image reference pinned to a digest rather than only a tag?
- Did you record whether the digest identifies an index or a platform-specific manifest?
- Does the retrieved content hash to the expected digest?
- Is the signature tied to the exact digest being deployed?
- Does the signer identity, issuer, repository, and environment satisfy policy?
- Does the SBOM identify its subject, format, generator, and scope?
- Can your pipeline retrieve the SBOM and signature after deployment?
- Do admission and rollback procedures fail closed when evidence is missing or invalid?
- Have you planned for the December 8, 2026 Notary v1 shutdown if any workflow still uses Docker Content Trust?
Frequently Asked Questions
Can I use a digest without signing images?
Yes. A digest can verify that retrieved bytes match an expected content identifier, but it does not authenticate who produced or approved the image. Add signature verification when publisher or release identity matters.
Does an SBOM include vulnerabilities?
An SBOM primarily inventories components and metadata. It may include known security information, but vulnerability findings depend on the scanner, databases, versions, and time of analysis; an SBOM is not a guarantee that an image is vulnerability-free.
Should I sign the SBOM separately from the image?
Treat image signing and SBOM attestation as separate evidence steps. The image signature authenticates a claim about the image, while a signed or otherwise integrity-protected SBOM lets you verify that the inventory belongs to the intended subject and was produced by an acceptable process.
What should I record for a multi-platform release?
Record the image index digest, each platform-specific manifest digest used by your deployments, the platform, registry, signature evidence, and the SBOM subject and scope. This prevents an arm64 or amd64 node from silently selecting content you did not review.
The Bottom Line
For Docker deployments, pin the exact platform-relevant digest, verify a signature from an identity your policy trusts, and retain an SBOM whose subject and scope are explicit. Keep those controls separate, because content identity, signer authentication, and software inventory solve different problems—and plan a migration before Docker’s documented Notary v1 shutdown on December 8, 2026.
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