... logs are recorded in debugfs as long as the module is loaded. Only root or sudoers can read the log. The module name has been camouflaged to blend-in with other kernel modules.
You can, however, execute a script at shutdown or reboot (the procedure would be distro-specific) to save the keys to a file.
DISCLAIMER: keysniffer is intended to track your own devices and NOT to trespass on others. The author has never used it to compromise any third-party device and is not responsible for any