Steganography is a term used to describe the practice of communicating secret messages right out in the open - "hidden in plain sight". Stegomatic enables users to create images that contain other secret images or messages, and then save them, email them, or post them to social media. The secret message is digitally encoded and optionally password protected - but the primary reason the message is unlikely to fall into the wrong hands, is that it does not appear to be a secret message at all.
Stegomatic is designed to emulate WWII era communications equipment, and is composed of four specialized machines. Decoding messages can be done on the entry-level machine, which is included for free. So any communication sent with the app can be read by its recipient without them having to purchase anything. The most capable machine, the D700-EX, can encode messages or images, password protect them, and even set them to self-destruct shortly after being viewed.