Port knocking allows you to only expose your SSH port if a certain set of TCP or UDP packets are received. It requires you to run a port knocking daemon on your server such as 'knockd'.
See the following wikipedia page for more information:
This plugin is open source and we welcome all contributors.
Please see the plugin's github repository for more information and please feel free to submit pull requests:
This JuiceSSH plugin requires JuiceSSH 1.5.0 or greater be installed