An image file is no exception to this. Since an image file has a form in a text code, you can open it using a text editor and enter a secret code in that text.

Most of the Linux configuration files are plain text and can be edited with either the Gedit graphical editor in GNOME or the Vi command line text editor, depending on your preference.

In the world of text editors, there's a plethora of options out there. If you've ever Googled "how to edit HTML sites" or some such, you know what we mean. Allow us, then, to introduce you to VIM ...