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Ensuring the authenticity and integrity of packages is a crucial part of maintaining the security of a Linux system. Whether you're installing software, updating packages, or performing system maintenance, verifying that the packages have not been tampered with since their creation is essential. This article will guide you on how to use rpm --checksig, as well as similar verification methods with apt, dnf, and zypper. Before diving into the specifics, it’s important to understand why package verification is necessary. Packages are typically signed with GPG (GNU Privacy Guard) keys that are owned by the package maintainers or distribution maintainers.