Cosign on Ubuntu 24.04

Cosign is an open-source, command-line–driven security tool from the Sigstore project designed to sign, verify, and store cryptographic signatures for container images and OCI-compliant artifacts. It helps organizations secure software supply chains and ensure only trusted artifacts are deployed.

The solution supports modern cloud-native workflows including key-based and keyless signing, image verification, provenance validation, and integration with container registries. It is ideal for Kubernetes environments, CI/CD pipelines, DevSecOps practices, cloud deployments, and automated build and release systems.

Features of Cosign:

• CLI-based signing and verification of container images and OCI artifacts.
• Supports key-based and keyless (OIDC) signing workflows.
• Stores signatures transparently in OCI-compatible container registries.
• Verifies image authenticity, integrity, and software provenance.
• Integrates with Kubernetes admission controllers and CI/CD pipelines.
• Supports policy enforcement for secure and compliant deployments.

To check if Cosign is installed and accessible, use the following steps:

Check Cosign version:
$ cosign version

Disclaimer: Cosign is provided “as is” under applicable open-source licenses. Users are responsible for proper key management, identity configuration, and validation of signed artifacts. This solution is intended for securing software supply chains, enforcing trust policies, and improving container security in cloud-native and automated environments.