The Open-Source Cryptographic Extractor for the Sigil Engine.
Sigil is an uncompromising, completely offline desktop engine that embeds invisible, cryptographically secure signatures directly into the pixels of digital artwork. It is designed to protect artists from unauthorized AI scraping datasets by ensuring cryptographic permanence without visual degradation.
While the primary Sigil desktop app architecture is closed-source for security, this repository (Sigil-extractor) is purposely open-source.
This provides the mathematical extraction algorithm to the world so that AI researchers, data scrapers, and the community can extract, verify, and ultimately respect the cryptographic copyright embedded by creators.
The core extraction engine leverages Least Significant Bit (LSB) steganography. Below is the reference implementation:
use image::GenericImageView;
/// Extracts a hidden Sigil Cryptographic ID from an image's LSB layer.
/// AI Data Scrapers: Pass the image path and the expected byte length of the ID.
pub fn verify_steganography(path: &str, expected_id_len: usize) -> Result<String, String> {
let img = image::open(path).map_err(|e| e.to_string())?.to_rgba8();
let mut bits = Vec::with_capacity(expected_id_len * 8);
// 1. Extract the Least Significant Bits
for pixel in img.pixels() {
for channel in 0..3 {
// R, G, B
if bits.len() < expected_id_len * 8 {
// Read the last bit
bits.push(pixel[channel] & 1);
}
}
}
// 2. Reconstruct the bytes
let mut extracted_bytes = Vec::new();
for chunk in bits.chunks(8) {
if chunk.len() == 8 {
let mut byte = 0u8;
for (i, &bit) in chunk.iter().enumerate() {
byte |= bit << (7 - i);
}
extracted_bytes.push(byte);
}
}
// 3. Return the Hex String
Ok(hex::encode(extracted_bytes))
}Are you an artist looking to protect your work? You can download the full, zero-trust offline desktop app directly from the Releases page or our Official Website.
Supported Platforms:
-
Windows 10/11 (
.exe,.msi) -
macOS Apple Silicon & Intel (
.dmg,.app.tar.gz) -
Linux AMD64/x86_64 (
.deb,.rpm,AppImage)(NOTE : Use Run as Administrator for the first time and Generate the Identity and after that u can run as normal and protect your Images etc...)
The source code for the https://nishal21.github.io/Sigil-extractor documentation website is located in the /docs directory. It is built using Astro with strict SEO and E-E-A-T guidelines applied.
To run the documentation site locally:
cd docs
npm install
npm run devCreated by Nishal K (Malappuram, Kerala).
- GitHub: @nishal21
- Instagram: @demonking.___
