Kryptel can be the application you are searching for. The versatility of the configuration will lead you to a very intuitive way to protect your private data, create backups or encrypt data by using powerful algorithms.
Kryptel integrates itself in the right-click menu, so it is extremely easy to use. If you want to encrypt some files you only have to right-click them and choose the encrypt option.
Kryptel can use several algorithms, but the most used ones are the following: AES, Blowfish, Serpent or IDEA.