Article about simple LSB steganography in JavaScript

9 hours ago

LSB steganography hides data in the least significant bits of image pixels, making changes invisible to the human eye.
It can encode messages by modifying pixel color values in lossless formats like PNG, with capacity calculated as (width × height × 3) / 8 bytes.
The process involves converting a message to bits, embedding them into RGB channels (skipping alpha), and adding a length header for decoding.
Legitimate uses include digital watermarking, covert communication, and data integrity verification.
Malicious applications include hiding malware in images to bypass security scanners, with real-world examples like Stegoloader and SolarWinds.
Detection methods include statistical analysis (chi-square, RS analysis) and tools like StegExpose or zsteg, while defenses involve image reprocessing or metadata stripping.
Limitations include fragility to compression (e.g., JPEG), resizing, and statistical detection; advanced techniques like randomized embedding or encryption improve robustness.
Best practices for legitimate use involve encrypting payloads, using high-resolution images, and avoiding reuse; for security, reprocess uploads and monitor for extraction tools.

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