# zed-0xff/zsteg

detect stegano-hidden data in PNG & BMP

Repository: https://github.com/zed-0xff/zsteg
Canonical: https://ross.abutalabs.com/products/zsteg
Homepage: http://zed.0xff.me
Language: Ruby
License Family: other
Last push: 2026-01-28T08:51:42+00:00

## Health v2 (maintenance only)
Score: 61/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 64, release rhythm 35, longevity 100
- inputs: {"age_days": 4987, "days_push": 217, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1617, forks 165 (observed 2026-08-28T04:05:12.032104+00:00)

## What it is
zsteg is a Ruby CLI tool that detects steganography-hidden data in PNG and BMP images, including LSB steganography, zlib-compressed payloads, and data hidden by tools like OpenStego and Camouflage. It supports fine-grained extraction parameters for channels, bit order, and pixel iteration order.

## Use cases
- detect hidden data in png images
- find lsb steganography in bmp files
- solve ctf stego challenges
- extract hidden strings from image files
- check if an image contains steganographic payloads
- identify openstego or camouflage hidden data

## When to choose
- you need a quick command-line stego detector for PNG/BMP
- you are solving CTF forensics challenges involving images
- you want tunable LSB extraction with channel/bit/order control

## When to avoid
- you need steganalysis for JPEG or other formats
- you need a GUI steganography tool
- you require a maintained project with an explicit license

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: security, image-processing, parser
- domain: security, image-processing, files
- platform: cli, cross-platform
- tags: steganography, ctf, png, bmp, lsb, ruby-gem, forensics

## Member repositories
- zed-0xff/zsteg (main) score 61

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:12.032104+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:49:59.470532+00:00, confidence not recorded.
  - readme: https://github.com/zed-0xff/zsteg (fetched 2026-08-28T04:05:12.032104+00:00, sha ecf09071c7cb)
  - homepage: http://zed.0xff.me (fetched 2026-08-29T11:22:21.665292+00:00, sha b9a8ae01d433)
  - site_page: http://zed.0xff.me/pages/cv (fetched 2026-08-29T11:22:21.669557+00:00, sha 42c2195d5fc3)
- Data as of 2026-08-30T08:39:29.467469+00:00.