Individual skill
implementing-sigstore-for-software-signing
Implements Sigstore-based software signing and verification using Cosign keyless signing, Rekor transparency log verification, and Fulcio certificate authority integration to establish cryptographic provenance for container images, binaries, and software artifacts. The practitioner configures OIDC-based identity binding, verifies signing events against the Rekor transparency log, and integrates signing workflows into CI/CD pipelines. Activates for requests involving software supply chain signing, keyless container signing, Sigstore deployment, or artifact provenance verification.
internal/tools/skills/data/supply-chain-security/implementing-sigstore-for-software-signing/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Last checked
- Nov 9, 2026
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- 1,320
- Repository last updated
- Nov 8, 2026
- License
- Apache-2.0
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- sigstore Declared skill tag
- cosign Declared skill tag
- rekor Declared skill tag
- fulcio Declared skill tag
- software-signing Declared skill tag
- supply-chain Declared skill tag
- keyless-signing Declared skill tag
- oidc Declared skill tag
- transparency-log Declared skill tag
- devops Derived category
- engineering Derived category
- operations Derived category
- devops-containers Derived category
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# Implementing Sigstore for Software Signing
## When to Use
- Signing container images and software artifacts without managing long-lived cryptographic keys
- Establishing verifiable provenance for build outputs in CI/CD pipelines using OIDC identity binding
- Querying the Rekor transparency log to audit when and by whom an artifact was signed
- Verifying that container images pulled from registries were signed by authorized identities and issuers
- Integrating Sigstore verification into Kubernetes admission controllers to enforce signed-image policies
**Do not use** for signing artifacts that require air-gapped or offline signing workflows where OIDC authentication is unavailable, for environments that cannot reach the public Sigstore infrastructure (Fulcio, Rekor) and have no private instance deployed, or as a replacement for traditional PGP/GPG signing where regulatory compliance mandates specific key management procedures.
## Common Misconfigurations & Verification
The classic Sigstore failure is signing everything correctly while verification is either absent or so loose it proves nothing.