The main objective of this post is to give you a quick glance at how you can create service menus and plugins for use under Dolphin, the default file manager in KDE.
In order to achieve the goal, you need to know what service you want to create for Dolphin. That's where I present you AES Crypt, a nice simple application that allows you to encrypt/decrypt your files in an easy and cross-platform way. Unfortunately, the linux version lacks some features, like UI integration (for obvious reasons), and it's up to us users to make something about it.