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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Bazel
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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
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Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Sigstore Fulcio
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Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Sigstore Rekor
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diffoscope
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Reproducible Builds Project · Open Source · 2 capabilities in this domain
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in-toto
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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
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Open Source Security Foundation (OpenSSF) · Open Source · 2 capabilities in this domain
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Archivista
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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

in-toto

Cloud Native Computing Foundation (CNCF) · Build Integrity & Cryptographic Trust

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Open SourceFoundationCNCF Graduated

in-toto lets project owners define which steps must occur and who may perform them, then verifies signed link metadata end to end.

Repository ↗

What it does2 capabilities · 1 at full coverage

1 of 2 at full coverage, 1 that nothing else provides.

Build Provenance AttestationPartialBUILD · level 3 · 15 providers
Supply Chain Layout VerificationFullBUILD · level 5 · only provider

What it proves8 controls across 5 frameworks

Satisfied through its capabilities, not claimed by the vendor.

SLSA 1.23 / 16Build L1 — Provenance generated and distributed Build L2 — Signed provenance Source L3 — Enforced technical controls
SSDF 1.12 / 42PS.2.1 PS.3.2
CRA1 / 41Annex I Part I (2)(f)
OWASP Top 101 / 10A08:2025
SP 800-204D1 / 11204D-CI-EVIDENCE

What it stops6 techniques · 1 risk

6 techniques countered, 1 of them common

Artifact Tampering After BuildCommon
Build System ImplantRare
SLSA threat D: Build from modified source or parametersSLSA-D
SLSA threat E: Compromised build processSLSA-E
SLSA threat F: Upload of a modified artifactSLSA-F
SLSA threat G: Compromised distribution channelSLSA-G

1 risks reduced

Released artifact does not match reviewed sourceCritical

Where it runs2 phases · 1 way to deploy

Capabilities per lifecycle phase

Build2
Release1

How it is delivered

CLI tool

What it unlocks2 activities · reaches level 5

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

Level 3

Signed SLSA provenance for every artifactLow effort

Level 5

Detect any change that bypassed the front doorMedium 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 standard

Standards and formats

in-toto Attestation Framework

What else to look at2 siblings

Same family

ArchivistaOpen Source
WitnessOpen Source

What backs this up

No measurement, incident or pipeline using it.

Gantry 7.1.0 · OFF.12 · OFF.13