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OutGuess is one of many steganography applications.

A hint that 3301 is using OutGuess was delivered in 2012. Without it we would probably never figured it out:

Duck
"Woops!

Just decoys this way.
Looks like you can’t guess how
to get the message
out.”


OutGuess is available under a BSD software license. It is completely free for all use. It was developed in Germany in 1999.

There are official executables for windows. However, OutGuess Rebirth doesn't work with Cicada 3301's JPEGs.

OutGuess is under certain circumstances considered undetectable. Although on the 3301's white text on black background JPEGs you can detect artifacts it produces very easily with visual inspection.

Homepage Outguess.org is down. Archive is available.

Here is the mirror from Kent UNI

Links:

Compiled x86 Windows version of Outguess.exe:

http://www.mediafire.com/download/3son7kwd3ox3j44/outguess.exe and

https://linx.li/hiiewsew.exe

Solution to have linux version of Outguess in windows: http://www.cygwin.com/

Source code for Win :Source of Outguess for Windows   file-upload.net mirror

For Mac OS: http://www.rbcafe.com/softwares/outguess

  • During installation of CYGWIN make sure that you check box at OutGuess (already included in CygWin)

    </li>TUTORIAL HOW TO USE IT http://uncovering-cicada.wikia.com/wiki/Loose_ends#HOW_TO_OUTGUESS

    HOW TO USE OUTGUESS

    If you use windows version make sure you are in command prompt

    Commands:

    outguess -r picwithoutguess.jpg textout.txt              (to outguess msg out)
    
    outguess -d secretmsg.txt sourcepic.jpg encryptedpic.jpg (to outguess message in pic)
    
    or just outguess                                         (for help)
    


    Stegdetect os uselsees. It detectes only outguess up to version 0.13.


    We are using Outguess 0.20 (official site down)

    http://www.outguess.org/detection.php

    http://www.outguess.org/download.php

    (mirror) http://ftp.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/steganography/outguess/

    Stego0