StegSolve

v1.4Caesum

The Java image analyzer CTF players live in: cycle per-channel bit planes, gray bits, color inversion and random color maps until hidden pixels become readable, then pull the payload out of the data-extract pane.

Category: Data decoding, cryptanalysis & analysis
Package: stegsolve
Runs on: Linux · Windows
Commands: stegsolve

Renders a deterministic image generated from the simulated file. Planes carrying an authored payload render it as readable pixels; nothing is uploaded.

Install it

The scripts below install the real Caesum package on your own machine — read them first, and run them somewhere you are allowed to change. Inside the range, one press puts the simulated package on your next machine.

Linux installer (shell script)

install-stegsolve.sh

StegSolve is delivered as Release archive, so it cannot be installed unattended. Follow the steps on the package page instead.

Windows installer (PowerShell)

Install-stegsolve.ps1

StegSolve has no unattended Windows install. Follow the steps on the package page.

On a range machine

Add it to your kit and every machine you launch comes with it.

On Linux

Release archive

Fetch the release and check its signature
Compare the published checksum before unpacking anything.
Unpack it under /opt
```
sudo unzip stegsolve.zip -d /opt/
```

Put the launcher on PATH

sudo ln -s /opt/stegsolve/stegsolve /usr/local/bin/stegsolve

Check it worked

Confirm it landed on PATH
```
which stegsolve
```
Check the version
```
stegsolve --version
```
The range reports 1.4.

Remove it

Take it off again
```
sudo apt remove --purge stegsolve
```

On Windows

Release archive

Unblock the download first
```
Unblock-File .\stegsolve.zip
```
Windows marks anything from the internet; unblock it or the extract fails.

Unpack it under C:\Tools

Expand-Archive .\stegsolve.zip -DestinationPath C:\Tools\stegsolve

Put it on PATH

setx PATH "$env:PATH;C:\Tools\stegsolve"

Check it worked

Confirm it resolves
```
where stegsolve
```
Check the version
```
stegsolve --version
```
The range reports 1.4.

Remove it

Take it off again

Remove-Item -Recurse -Force C:\Tools\stegsolve

Inside the range

Tick it on the launch screen
Under StegSolve's category on the advanced tool shelf. A lab that depends on it locks the toggle on and says why.
Or install it from a range terminal
```
sudo apt install -y stegsolve
```
The simulated package manager seeds the same binaries, config and receipt the shelf toggle does.
Everything here is simulated
No software is downloaded and nothing executes — the range answers from authored fixtures.

Labs that use StegSolve

No lab locks this one on yet — tick it on the launch screen and take it into any scenario.