Securing Data and Validating Identity Through GPG

In a modern DevSecOps pipeline, automating deployments without verifying their authenticity introduces critical software supply chain vulnerabilities. Security extends beyond system hardening; it requires proving that source code and packaged components have not been altered during transit to production environments. This chapter delivers a systematic, practical framework to mastering GPG (GNU Privacy Guard) within the Linux ecosystem. Moving past theoretical cryptographic concepts, you will examine key management best practices, including secure offline backups and the Web of Trust architecture. Crucially, you will implement digital signatures to sign and verify both raw documents and native RPM packages. Whether you are a student learning to secure the software delivery lifecycle or a veteran administrator ensuring that enterprise repositories deploy exclusively authentic, uncorrupted artifacts, this guide establishes the foundational layer required to mitigate code tampering.