Stegano: LSB Image Steganography

Overview

Stegano is a pure-Python steganography library that hides text data inside PNG images by modifying the least significant bits of pixel values. The changes are imperceptible to the human eye, making it useful for watermarking, covert communication, and data embedding.

Quick Start

Embed a message:

bash

python scripts/embed_watermark.py --input image.png --output watermarked.png --watermark "secret message"

Extract a message:

bash

python scripts/extract_watermark.py --input watermarked.png --output message.txt

Scripts

`scripts/embed_watermark.py`

Embed a text watermark into a PNG image using LSB encoding.

bash

python scripts/embed_watermark.py --input <image.png> --output <output.png> --watermark <text>

Parameters:

•--input — Source PNG image path
•--output — Output watermarked PNG path
•--watermark — Text message to embed

`scripts/extract_watermark.py`

Extract a hidden text message from a steganographic PNG image.

bash

python scripts/extract_watermark.py --input <watermarked.png> --output <message.txt>

Parameters:

•--input — Watermarked PNG image path
•--output — Output text file path

`scripts/embed_hidden_text.py`

Embed a predefined "hidden_text" watermark into an image.

bash

python scripts/embed_hidden_text.py --input <image.png> --output <output.png>

Important Notes

•PNG only — JPEG compression destroys LSB data; always use PNG format
•Capacity — Maximum message length depends on image dimensions (width × height bits available)
•Dependency — Requires stegano package (pip install stegano)