

The forum on Reddit (“Subreddit”) contained this image in the header, and also had the title a2e7j6ic78h0j7eiejd0120. To decode it, you will need access to the book. A book cipher consists of numbers that reference pages, paragraphs, lines, words or letters in a book. This message tells you that the numbers are a book cipher (also called a book code). To find the book, and more information, go to If you use OutGuess, you get a much more interesting message: Here is a book code. This indicates that you should use the steganography tool OutGuess.
#OUTGUESS DECODER HOW TO#
Still, it contains two keywords that hint at how to get the REAL message out: guess and out. It will then give a link to an Imgur image: cicada 3301-outguess-hint To decode it, you will have to set the Shift to 4 and the Language to “Custom”. Indeed, you can use Boxentriq’s Caesar Cipher decoder to solve it: Decoded Caesar Cipher from Cicada 3301 The text about TIBERIVS CLAVDIVS CAESAR indicates that the following text is a Caesar Cipher. See the screenshot below: Text extracted from the Cicada 3301 puzzle 4chan invitation You can download the image and try it yourself with Boxentriq’s Text Extractor tool.

There was indeed a message hidden in this image. First Cicada 3301 puzzle invitation on 4chan On January 5th, 2012, a mysterious image was posted on 4chan’s /x/ – Paranormal board. Always verify PGP signature from 7A35090F. The last public, and verified, communications from Cicada 3301 was in April 2017: Beware false paths. A second round began one year later on January 4, 2013, and then a third round following the confirmation of a fresh clue posted on Twitter on January 4, 2014. Cicada 3301 challenge first appeared in January 4, 2012, with a picture posted on 4Chan and ran for nearly a month.
