Hill Cipher app in Python with GUI

Ok, today I made an app for Hill Cipher. I know that I posted some articles about this subject, even some source code in C for the version with message saved as an array but today I made an app with GUI in Python for the version with message saved as a matrix. And works fine!
So, I wont put the source code, only a deb file for installing and running this app on Ubuntu distros and a short PDF that explain the mode how this programm encode/decode a message.
About the message, forgive me for some errors, it was my first time when I used LaTex. So, you can find the archive HERE