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Vendor pateon
Package steganography
Short Description Invisible anti-counterfeiting for images using LSB Steganography (PHP 8.5+). Supports Imagick and GD.
License MIT

Keywords image gd imagick watermark steganography lsb anti-counterfeiting

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Informations about the package steganography

Steganography

A PHP 8.5+ library for invisible anti-counterfeiting of images using LSB (Least Significant Bit) Steganography. This library hides a secret message inside an image file, invisible to the human eye.

Features

✅ Invisible: Modifies only the Least Significant Bits (LSB) of RGB pixel values
✅ Compression: Compresses messages using Zlib before embedding
✅ Unicode Support: Full support for UTF-8, including CJK characters and emoji
✅ Dual Driver Support: Prioritizes Imagick, falls back to GD automatically
✅ Format Support: Reads JPG, PNG, GIF, WebP, BMP as source images
✅ Lossless Output: Always outputs as PNG to preserve hidden data
✅ PHP 8.5+: Uses modern PHP features (typed constants, readonly properties, match expressions)
✅ Composer Ready: PSR-4 autoloading, ready for integration

Requirements

PHP >= 8.5
ext-zlib (for compression)
ext-imagick (recommended) OR ext-gd (at least one is required)

Installation

Usage

Basic Usage

Force Specific Adapter

Calculate Maximum Message Size

Custom Compressor

⚠️ Important Notes

Output Format: Always save encoded images as PNG. JPG compression is lossy and will destroy the hidden data.
Source Format: JPG, PNG, GIF, WebP, and BMP are supported as source images.
Image Size: Larger images can store more data. Use calculateMaxMessageSize() to check capacity.
Imagick vs GD: Imagick is preferred for better performance. GD is used as fallback.

Architecture

How It Works

Compression: The message is compressed using Zlib
Encoding: Compressed data is Base64 encoded, then converted to binary (0s and 1s)
Embedding: Each pixel's RGB values have their LSB modified to store 3 bits (1 per channel)
Header: A 48-bit length header is prepended to know how much data to read when decoding

License

MIT License - see LICENSE file

All versions of steganography with dependencies

PHP Build Version

Package Version

Version v1.1 Release 28. Dec 2025
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Requires php Version >=8.5.0
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