ykpers (yubikey-personalization) is a library and command-line tool to perform personalization of Yubico YubiKeys and is a reference implementation for YubiKey configuration. For challenge-response mode to work as a normal user, you will have to create a 'yubikey' group and add your user to it. The recommended GID is 288. You can create this by doing the following: groupadd -g 288 yubikey You can use the plugdev group (or another group) if you like, by passing a group name to the script: GROUPNAME=plugdev ./ykpers.SlackBuild json-c is an optional dependency.