![]() This PGP (GnuPG) key is how to verify their authenticity. This is VERY important information since there are many imposters pretending to be Cicada 3301. MUpLKFn8ZcMbf7UX18frgOtujmqqUvDQ2dQhmCUywPdtsKHFLc1xIqdrnRWUS3CDĮejUzGYDB5lSflujTjLPgGvtlCBW5ap00cfIHUZPOzmJWoEzgFgdNc9iIkcUUlkeĮ2WbYwCCuwSlLsdQRMA//PJN+a1h2ZMSzzMbZsr/YXQDUWvEaYI8MckmXEkZmDoA SkpshcjMVV9xPIEYzwSEaqBq0ZMdNFEPxJzC0XISlWSfxROm85r3NYvbrx9lwVbP HJl8llrt8Gnk1UaZUS6/eCjnBniV/BLfZPVD2VFKH2Vvvty8sL+S8hCxsuLCjydh C6IehRChpx8gwpdhIlNf1coz/ZiggPiqdj75Tyqg88lEr66fVVB2d7PGObSyYSp X5biG6TBwxfmXQOaITdO5rO8+4mtLnP//qN7E9zjTYj4Z4gBhdf6hPSuOqjh1s+6 ehVI5BiBJq8GlOnaSRZpzsYobwKH6Jy6haAr3kPFK1lOXXyHSiNnQbydGw9BFRIįSr//DY86BUILE8sGJR6FA8Vzjiifcv6mmXkk3ICrT8z0qY7m/wFOYjgiSohvYpg IQIcBAEBAgAGBQJPBRz7AAoJEBgfAeV6NQkP1UIQALFcO8DyZkecTK5pAIcGez7kĮwjGBoCfjfO2NlRROuQm5CteXiH3Te5G+5ebsdRmGWVcah8QzN4UjxpKcTQRPB9e Key ID 7A35090F, as posted in a2e7j6ic78h0j. From here on out, we will cryptographically sign all messages with this key. Using OutGuess on the welcome image gives this text: -BEGIN PGP SIGNED MESSAGE. It also contained a lot of lines of text, and two images: Cicada 3301 Subreddit Welcome Image (original) 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. 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.
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