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Government · head to head

Azure Government vs Cosign

Azure Government logo

Azure Government

Government

Trusted Cloud for Government

From
On request
Free plan
No
Full reviewWebsite
Cosign logo

Cosign

Cybersecurity

Signs and verifies container images and artifacts, with or without managing keys

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • Each has a real cost: Azure Government restricted to US government entities, their solution providers and contractors handling government data, with Microsoft validating eligibility first; Cosign keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
  • They diverge on capability: Azure Government covers FedRAMP High Authorized, Cosign covers Keyless signing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Azure Government and Cosign actually diverge.

Attributes where Azure Government and Cosign differ
AttributeAzure GovernmentCosign
Starting priceOn requestFree
Pricing modelusage-basedOpen source, no licence fee
Free tierNoYes
PlatformsWeb, Cli, SdkmacOS, Linux, Windows, Docker
CategoryGovernmentCybersecurity
Founded1975Unknown

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Azure Government

  • FedRAMP High Authorized
  • DOD IL5 Approved
  • Isolated Datacenters
  • Hybrid Cloud
  • AI & ML Services
  • Microsoft 365
  • Dynamics 365
  • Power Platform

Only in Cosign

  • Keyless signing
  • Key and KMS signing
  • Registry-native storage
  • In-toto attestations
  • Offline verification
  • Trusted root and signing config

What people use each for

The jobs each tool is most often brought in to do.

Azure Government

  • Hosting US government workloads in dedicated domestic datacentresnot Cosign
  • Systems needing FedRAMP High, DoD IL2 to IL5, CJIS or ITAR authorisationnot Cosign
  • State, local and tribal government cloud servicesnot Cosign
  • Contractors processing controlled government datanot Cosign

Cosign

  • Signing container images in a build pipeline without managing long-lived private keysnot Azure Government
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Azure Government
  • Meeting a customer or regulatory requirement for signed artifactsnot Azure Government
  • Verifying third-party images before they enter an internal registrynot Azure Government

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Azure Government

  • Restricted to US government entities, their solution providers and contractors handling government data, with Microsoft validating eligibility first
  • A narrower service catalogue than commercial Azure
  • New features arrive later than in the commercial regions
  • Pricing is not published and runs through federal contract vehicles such as JWCC, GSA and NASA SEWP

Cosign

  • Keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
  • A signature proves who signed, never whether they should have. The documentation is explicit that Sigstore cannot determine authorisation, so every consumer must write and maintain their own identity and issuer policy or verification means nothing.
  • Nothing is enforced without an admission controller. Signing changes what you can prove, not what runs, and the official policy controller has a small maintainer base for a component sitting in a cluster admission path.
  • Upgrades break pipelines. Version 3 changed defaults, version 4 is announced as removing legacy functionality and roughly half the command line flags, and two official client libraries still lacked support for the new log format as of mid 2026.
  • Signatures do not expire. An artifact signed before a maintainer account was compromised and one signed after are indistinguishable unless somebody is actively monitoring the transparency log, and almost nobody is.

Pricing, plan by plan

Azure Government

On request
  • Pay-as-you-goFree
    • Virtual Machines
    • Azure SQL
    • Storage

Cosign

Free
  • CosignFree
    • Apache-2.0
    • Public Sigstore infrastructure free to use
    • No usage limits published

Which should you pick?

Choose Azure Government if

  • You need fedramp high authorized.
  • You work on Web, Cli, Sdk.
  • You also want dod il5 approved.
Azure Government review

Choose Cosign if

  • You need keyless signing.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, Docker.
  • You also want key and kms signing.
Cosign review

Questions people ask

Is Azure Government or Cosign better?
Neither clearly leads. Azure Government starts at On request and Cosign at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Government or Cosign?
Cosign has a free tier; the other does not. Paid plans start at On request for Azure Government and Free for Cosign.
Does Azure Government or Cosign run on more platforms?
Azure Government runs on Web, Cli, Sdk. Cosign runs on macOS, Linux, Windows, Docker.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Azure Government starts at On request.
What is Azure Government best used for?
Azure Government is most often used for hosting us government workloads in dedicated domestic datacentres, systems needing fedramp high, dod il2 to il5, cjis or itar authorisation, state, local and tribal government cloud services, contractors processing controlled government data. Of those, hosting us government workloads in dedicated domestic datacentres and systems needing fedramp high, dod il2 to il5, cjis or itar authorisation are not what Cosign is typically brought in for.
What can Azure Government do that Cosign cannot?
Azure Government covers FedRAMP High Authorized, DOD IL5 Approved, Isolated Datacenters, Hybrid Cloud. Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations.

Answered from the vendors’ own pages

Azure Government: How is Azure Government pricing determined?

Azure pricing follows a pay-as-you-go model where you only pay for services you use. Prices vary by product, region, and usage patterns. Committed use discounts and reserved instances can save up to 65% for compute services.

Source
Cosign: Does Cosign tell me if an image is vulnerable?

No. It has no vulnerability knowledge whatsoever. It can carry an SBOM as a signed attestation but never reads it. Pair it with a scanner.

Cosign: Is signing alone enough?

No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.

Cosign: What does a bare cosign verify actually prove?

Very little. Without a pinned certificate identity and OIDC issuer, it accepts a valid signature from any identity at all.

Cosign: What is the risk of keyless signing?

Your OIDC provider becomes the root of trust. Compromise of that account yields genuine, verifiable signatures, so account security is the control that matters.

Cosign: Should we expect breaking changes?

Yes. Version 4 is announced to remove roughly half the flags, and a post-quantum migration is named as a further breaking change after that.

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