Steggy CLI Tool

Written in Rust, features a simple cli and a client-side webapp. This tool hides data within the least significant bit of an image. Obfuscation techniques are utilized to make the

Install

bash brew tap oliverbutler/steggy brew install steggy

Usage

Encode

bash steggy encode -f secret.txt -i image.jpg -o out.png

Decode

Decode will output the image inside an encoded image in the same path, optionally allows an output path for the resulting data.

bash steggy decode -i out.png

Image Data Structure

This is the structure of a steggy encoded image file.

| Pos | Length | Field | | ---- | -------- | -------------- | | 0 | 1 byte | Flags (unused) | | 1 | 4 bytes | Name length | | 2 | 4 bytes | Data length | | 6 | 16 bytes | Salt | | 22 | X | Name | | 22+x | Y | Data |