Build Integrity & Cryptographic Trust

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Sigstore Cosign
Scored
Open Source Security Foundation (OpenSSF) · Open Source · 4 capabilities in this domain · 4.18 / 5
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AWS Signer
Capabilities only
Amazon Web Services · Commercial · 3 capabilities in this domain
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Chainguard Factory
Capabilities only
Chainguard · Commercial · 3 capabilities in this domain
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Notation (Notary Project)
Capabilities only
Cloud Native Computing Foundation (CNCF) · Open Source · 3 capabilities in this domain
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Tekton Chains
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Continuous Delivery Foundation · Open Source · 3 capabilities in this domain
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Witness
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Cloud Native Computing Foundation (CNCF) · Open Source · 3 capabilities in this domain
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Azure Trusted Signing
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Microsoft · Commercial · 2 capabilities in this domain
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Bazel
Capabilities only
Google · Open Source · 2 capabilities in this domain
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CyberArk Code Sign Manager
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CyberArk · Commercial · 2 capabilities in this domain
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Keyfactor Signum
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Keyfactor · Commercial · 2 capabilities in this domain
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SLSA GitHub Generator
Capabilities only
Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Sigstore Fulcio
Capabilities only
Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Sigstore Rekor
Capabilities only
Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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diffoscope
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Reproducible Builds Project · Open Source · 2 capabilities in this domain
selected
in-toto
Capabilities only
Cloud Native Computing Foundation (CNCF) · Open Source · 2 capabilities in this domain
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melange
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Chainguard · Open Source · 2 capabilities in this domain
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slsa-verifier
Capabilities only
Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Archivista
Capabilities only
Cloud Native Computing Foundation (CNCF) · Open Source · 1 capabilities in this domain
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Kosli
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Kosli · Freemium · 1 capabilities in this domain
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In Build Integrity & Cryptographic Trust

Sigstore Rekor

Open Source Security Foundation (OpenSSF) · Build Integrity & Cryptographic Trust

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Open SourceFoundation

Rekor records signing events so anyone can audit what was signed by which identity and when, and provides inclusion proofs for offline verification.

Repository ↗

What it does2 capabilities · 1 at full coverage

1 of 2 at full coverage, 1 through a named feature.

Artifact Chain-of-Custody TracingPartialBUILD · level 4 · 4 providers
Keyless Signing with Transparency LogFullBUILD · via a feature · level 3 · 8 providers

What it proves6 controls across 5 frameworks

Satisfied through its capabilities, not claimed by the vendor.

SSDF 1.12 / 42PS.2.1 PS.3.2
CI/CD Top 101 / 10CICD-SEC-9
CSF 2.01 / 106ID.AM-08
SLSA 1.21 / 16Build L3 — Signing secrets isolated
SP 800-204D1 / 11204D-CI-EVIDENCE

What it stops2 techniques · 1 risk

2 techniques countered, 1 of them common

Artifact Tampering After BuildCommon
Code Signing Key TheftRare

1 risks reduced

Released artifact does not match reviewed sourceCritical

Where it runs3 phases · 2 ways to deploy

Capabilities per lifecycle phase

Build2
Release2
Deploy1

How it is delivered

SaaSSelf-hosted

What it unlocks3 activities · reaches level 5

Program activities its capabilities support, reaching level 5. Supporting an activity is not completing it.

Level 2

Sign release artifactsLow effort

Level 4

Verify provenance and attestations before promotionMedium effort

Level 5

Full chain of custody for every artifactHigh effort

How it holds up

Not assessed yet: no strengths, limits or evaluation scores. 47 of 340 products carry an assessment and 29 are scored.

What it costsOpen source (free) · free tier

LicensingOpen source (free)

Priced pernone

BillingFree

Scales withOperating effort only

Total cost

No license cost, but self-support, upgrades, scaling and integration effort must be budgeted as personnel cost.

What it takes to run

No staffing, rollout time or operational commitment recorded.

What it works with1 feature

Named features

Append-only transparency log with inclusion proofsAppend-only transparency log with inclusion proofs in Sigstore Rekor.

What else to look at5 siblings

Same family

GitsignOpen Source
OpenSSF Model SigningOpen Source
Sigstore CosignOpen Source · 4.18
Sigstore FulcioOpen Source
Sigstore Policy ControllerOpen Source

What backs this up

No measurement, incident or pipeline using it.

Gantry 7.1.0 · OFF.12 · OFF.13