That’s the moment you realize continuous integration isn’t just about speed. It’s about trust. Without trust in your code, in your commits, and in your build artifacts, speed doesn’t matter.
GPG in Continuous Integration isn’t a luxury. It’s a layer that guarantees integrity from commit to production. With Git commit signing and artifact verification through GNU Privacy Guard (GPG), you ensure every change comes from a verified source. No unknown fingerprints. No spoofed commits. No silent injections.
A modern CI pipeline should verify GPG signatures before merging and before deploying. This alone stops a large class of supply chain attacks. The workflow is simple: developers sign commits locally with their private keys, the CI server verifies the signature against the developer’s trusted public key, and only then does the build run. When artifacts are produced, they are signed again—now at the CI level—so downstream systems can trust them.
Why this matters now:
The attack surface for your software has moved upstream. Code that looks clean can be poisoned before it even hits production. GPG verification in CI isn’t just about authenticity; it’s about enforcing a chain of custody for every byte that ships.