PNGme

PNGme is a command-line tool that allows you to hide secret messages inside PNG image files without changing how they look.

This project is an implementation of the "PNGme: An Intermediate Rust Project" tutorial, made for learning purposes.

What does this tool do?

This program can:

• Hide text messages inside PNG files
• Extract hidden messages from PNG files
• Remove hidden messages from PNG files
• Show all data chunks in a PNG file

The hidden messages are stored in the PNG file's metadata chunks, so the image looks exactly the same but contains your secret data.

Installation

1. Make sure you have Rust installed: https://rustup.rs/

2. Clone and build the project:

git clone https://github.com/yalperg/PNGme.git
cd PNGme
cargo build --release

Commands

encode - Hide a message

Hide a secret message in a PNG file:

cargo run -- encode <PNG_FILE> <CHUNK_TYPE> "<MESSAGE>"

Example:

cargo run -- encode photo.png "ruSt" "This is my secret message"

You can also save to a different file:

cargo run -- encode photo.png "ruSt" "Secret text" --output-file new_photo.png

decode - Extract a message

Get a hidden message from a PNG file:

cargo run -- decode <PNG_FILE> <CHUNK_TYPE>

Example:

cargo run -- decode photo.png "ruSt"

remove - Delete a message

Remove a hidden message from a PNG file:

cargo run -- remove <PNG_FILE> <CHUNK_TYPE>

Example:

cargo run -- remove photo.png "ruSt"

print - Show file information

Display all chunks in a PNG file:

cargo run -- print <PNG_FILE>

Example:

cargo run -- print photo.png