This document provides an introduction to an encryption and decryption application created by a group including Saif Islam, Habab Nisar, and Bilal Rafique. It describes encryption as converting data into an unreadable ciphertext using a key or algorithm, while decryption transforms the data back to its original readable form. The application uses Matlab commands to convert arrays and read/write audio files with a graphical user interface created using the GUIDE command. It has various uses for secure data transfer, military intelligence, and safe communication.