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In the world of Linux, ensuring the security and integrity of software packages is paramount. This is why understanding different repository signing mechanisms is crucial for anyone managing Linux systems. Signed repositories help safeguard users against malicious packages and unauthorized modifications. In this article, we'll explore how repository signing works and give specific operating instructions for three popular package managers: apt (used in Debian and Ubuntu), dnf (used in Fedora), and zypper (used in openSUSE). Repository signing is a mechanism used to ensure that the packages you download and install on your system are exactly what they claim to be. This is done by using digital signatures.