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Cybersecurity · head to head

Cosign vs Varonis Data Security Platform

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
Varonis Data Security Platform logo

Varonis Data Security Platform

Cybersecurity

Data security platform that maps effective permissions, content classification and access activity across file shares, Microsoft 365 and SaaS.

From
$100/year
Rated
-
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • Each has a real cost: 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.; Varonis Data Security Platform deployment is a project rather than an installation: collectors, service accounts, the initial crawl of a large file estate and behavioural baselining typically run for weeks to months before the first genuinely useful report, so value arrives well after the invoice does.
  • They diverge on capability: Cosign covers Keyless signing, Varonis Data Security Platform covers Effective permissions modelling.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and Varonis Data Security Platform actually diverge.

Attributes where Cosign and Varonis Data Security Platform differ
AttributeCosignVaronis Data Security Platform
Starting priceFree$100/year
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsmacOS, Linux, Windows, DockerWeb, Desktop
FoundedUnknown2005

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

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 Cosign

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

Only in Varonis Data Security Platform

  • Effective permissions modelling
  • Content classification
  • Access activity auditing
  • Behavioural alerting
  • Blast radius view
  • Automated remediation
  • Stale data identification
  • Ransomware detection

What people use each for

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

Cosign

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

Varonis Data Security Platform

  • Answering an auditor or a board asking exactly which sensitive files are reachable by every employee and who has opened themnot Cosign
  • Cleaning up Microsoft 365 sprawl where Teams, SharePoint sites and shared links accumulated faster than governancenot Cosign
  • Investigating an insider incident where you need a defensible record of what a departing employee accessed and whennot Cosign
  • Reducing the blast radius of a compromised account before an incident by removing global access groups and broken inheritancenot Cosign

Where each one falls short

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

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.

Varonis Data Security Platform

  • Deployment is a project rather than an installation: collectors, service accounts, the initial crawl of a large file estate and behavioural baselining typically run for weeks to months before the first genuinely useful report, so value arrives well after the invoice does.
  • The collection model requires granting the platform broad read access across the data you are trying to protect, which needs its own approval and creates a high-value target, and some change boards spend longer approving that access than approving the purchase.
  • Findings are produced far faster than remediation capacity: an initial scan routinely surfaces hundreds of thousands of overexposed objects, and fixing them means altering permissions owned by business units, so without an executive mandate it becomes a dashboard nobody acts on.
  • Licensing is driven by identity counts and connected data sources, so a directory full of stale accounts and service principals inflates the bill and every additional platform you connect adds cost, which quietly pushes organisations to leave their least-governed systems uncovered.
  • Coverage is deepest in the Microsoft estate and thinner elsewhere: connectors exist for other SaaS and database platforms but they do not all support the same classification, alerting and automated remediation, so a heterogeneous estate receives uneven protection at a uniform price.

Pricing, plan by plan

Cosign

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

Varonis Data Security Platform

$100/year
  • Varonis Essentials$100/year
    • Data classification
    • Access visibility
    • Permission management
  • Varonis Professional$175/year
    • All Essentials features
    • Threat detection
    • User behavior analytics
  • Varonis Enterprise$300/year
    • All Professional features
    • Advanced analytics
    • Incident response

Which should you pick?

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

Choose Varonis Data Security Platform if

  • You need effective permissions modelling.
  • You work on Web, Desktop.
  • You also want content classification.
Varonis Data Security Platform review

Questions people ask

Is Cosign or Varonis Data Security Platform better?
Neither clearly leads. Cosign starts at Free and Varonis Data Security Platform at $100/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or Varonis Data Security Platform?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and $100/year for Varonis Data Security Platform.
Does Cosign or Varonis Data Security Platform run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. Varonis Data Security Platform runs on Web, Desktop.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Varonis Data Security Platform starts at $100/year.
What is Cosign best used for?
Cosign is most often used for signing container images in a build pipeline without managing long-lived private keys, attaching a signed bill of materials to a release so consumers can verify its provenance, meeting a customer or regulatory requirement for signed artifacts, verifying third-party images before they enter an internal registry. Of those, signing container images in a build pipeline without managing long-lived private keys and attaching a signed bill of materials to a release so consumers can verify its provenance are not what Varonis Data Security Platform is typically brought in for.
What can Cosign do that Varonis Data Security Platform cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Varonis Data Security Platform covers Effective permissions modelling, Content classification, Access activity auditing, Behavioural alerting.

Answered from the vendors’ own pages

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.

Varonis Data Security Platform: Is this data loss prevention?

No, and it is a common confusion. DLP watches data in motion and tries to stop it leaving. Varonis works on data at rest: where it is, who can reach it, and who touched it. They address different halves of the same problem and organisations frequently run both.

Cosign: Is signing alone enough?

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

Varonis Data Security Platform: On-premises or SaaS?

It is now sold principally as SaaS, with edge collectors deployed on your network to reach on-premises file shares and directories. Older on-premises deployments with Windows collectors and SQL Server still exist in the field and are being migrated.

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.

Varonis Data Security Platform: Does it need agents on every server?

Generally no. It collects through APIs and network protocols with service accounts, with collectors deployed near the data rather than agents on every host. That is one reason deployment is less invasive than the scale of the data suggests.

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.

Varonis Data Security Platform: How long until it is useful?

Expect weeks to a few months depending on the size of the file estate and how quickly the service accounts and access are approved. The classification and behavioural baselining both need time before the alerts mean anything.

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.

Varonis Data Security Platform: Can it fix the problems it finds automatically?

Yes, it can remove global access groups, repair broken inheritance and quarantine exposed files under policy. Most organisations run this in simulation first, because automatically changing permissions on live business data goes wrong loudly.

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