Release signing is the process of applying a cryptographic signature to software builds, packages, or update metadata before they are distributed. The signature lets users, package managers, and update systems verify that the release came from the expected publisher and was not altered after it was built.
This matters because software distribution depends on trust. If attackers can modify a release in transit, they may try to insert malware, backdoors, or tampered updates. A valid signature helps defenders detect that kind of interference, while a leaked signing key can let an attacker produce convincing fake releases. In practice, release signing is paired with key protection, key rotation, and verification tools such as GPG or code-signing infrastructure. Strong release processes treat signing keys as high-value secrets, because losing control of them can undermine confidence in every build they protect.