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When you use Linux, one of the essential security practices involves managing GPG (GNU Privacy Guard) keys. GPG keys help ensure the integrity and authenticity of your software packages by verifying that they are signed by trusted sources. This blog post will guide you through the process of managing GPG keys for trusted repositories across different package managers like apt, dnf, and zypper. GPG keys are cryptographic tokens used in the process of securing communication and data. In the context of Linux repository management, GPG keys enable you to verify the authenticity of packages downloaded from repositories. When a package is installed, the package manager checks the signature against the GPG key to ensure it is not tampered with.