Cicada 3301

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Cicada 3301 logo

Cicada 3301 is a name given to an enigmatic organization that on three occasions has posted a set of complex puzzles to recruit capable cryptanalysts from the public.[1] The first Internet puzzle started on January 5, 2012, and ran for approximately one month. A second round began one year later on January 5, 2013, and a third round is ongoing following confirmation of a fresh clue posted on Twitter on January 5, 2014.[2][3] The stated intent was to recruit "intelligent individuals" by presenting a series of puzzles which were to be solved, each in order, to find the next. No new puzzles were published on January 5, 2015.[4] The puzzles focused heavily on data security, cryptography, and steganography.[1][5][6][7][8]

It has been called "the most elaborate and mysterious puzzle of the internet age"[9] and is listed as one of the "Top 5 eeriest, unsolved mysteries of the Internet" by The Washington Post,[10] and much speculation exists as to its purpose. Many have speculated that it is a recruitment tool for the NSA, CIA, MI6, or a cyber mercenary group.[1][6] Others have claimed it is an Alternate Reality Game (ARG), but the fact that no company or individual has taken credit or tried to monetize it, combined with the fact that none who have solved the puzzles have ever come forward, has led most to feel that it is not.[9] Others have claimed it is run by a bank working on cryptocurrency.[9]


The stated purpose of the puzzles each year has been to recruit "highly intelligent individuals," though the ultimate purpose remains unknown.[1] Some have claimed that Cicada 3301 is a secret society with the goal of improving cryptography, privacy and anonymity.[11]


The ultimate outcome of all three rounds of Cicada 3301 recruiting is still a mystery. The final known puzzles became both highly complex and individualized as the game unfolded. Anonymous individuals have claimed to have "won," but verification from the organization was never made and the individuals making the claim have not been forthcoming with information.[6][7][12]

An email was reportedly sent to some individuals who completed the 2012 puzzle, revealing that those who successfully solved the puzzles were given a personality assessment. Those who passed this stage were reportedly admitted into the organization, although nothing more is known.[11]

Types of clues[edit]

The Cicada 3301 clues have spanned many different communication mediums including Internet, telephone, original music, bootable Linux CDs, digital images, physical paper signs, and pages of unpublished cryptic books. In addition to using many varying techniques to encrypt, encode or hide data, these clues also have referenced a wide variety of books, poetry, artwork and music.[1] Each clue has been signed by the same GnuPG private key to confirm authenticity.[8][13]

Among others, these referenced works include:

Physical locations of clues[edit]

Cicada 3301 poster with QR code discovered in Warsaw, Poland.

Throughout the testing, multiple clues have required participants to travel to various places to retrieve the next clue. These clue locations have included the following cities:

Speculation that the Cicada 3301 organization is large and well-funded is supported by the existence of clues in a large number of locations, all quite distant from one another, appearing at the same time.[6][7]

Allegations of illegal activity[edit]

Authorities from the Los Andes Province of Chile claim that Cicada 3301 is a "hacker group" and engaged in illegal activities. Cicada 3301 responded to this claim by issuing a PGP-signed statement denying any involvement in illegal activity.[14][15]


The United States Navy released a cryptographic challenge based on the Cicada 3301 recruitment puzzles in 2014 calling it Project Architeuthis.[16][17]

The National Security Agency (NSA) posted a series of Cicada 3301-inspired encryption puzzles each Monday throughout May 2014 as a part of their recruitment efforts.[18]

"Nautilus," the September 30, 2014, episode of the TV show Person of Interest, featured a large-scale game very similar to the Cicada 3301 puzzles. Both feature a series of worldwide cryptographic puzzles, but instead of a cicada logo, these feature the image of a nautilus.[19] Person of Interest creator Jonathan Nolan and producer Greg Plageman stated in an interview that Cicada 3301 was the inspiration for the episode: "Episode 2, I’m particularly fascinated by the subject underneath it. Look up Cicada 3301 on the internet. It’s a very interesting concept out there that we then put into a larger story that connects to our show."[20]

"Just a Regular Irregular," the November 13, 2014, episode of the TV show Elementary, featured a "math hunt," specifically mentioning its similarity to the Cicada 3301 puzzles multiple times.[21]

See also[edit]


  1. ^ a b c d e "The internet mystery that has the world baffled". Daily Telegraph. 25 November 2013. Archived from the original on 25 November 2013. Retrieved 25 November 2013. 
  2. ^ Bell, Chris. "Cicada 3301 update: the baffling internet mystery is back". Daily Telegraph. Archived from the original on January 7, 2014. 
  3. ^ Hern, Alex. "Cicada 3301: I tried the hardest puzzle on the internet and failed spectacularly". The Guardian. Archived from the original on January 11, 2014. 
  4. ^ "Uncovering Cicada 2015 main menu". Retrieved 5 January 2015. 
  5. ^ "Is mystery internet challenge a recruiting tool for the CIA?". Channel 4 News. 27 November 2013. Archived from the original on 27 November 2013. Retrieved 27 November 2013. 
  6. ^ a b c d Lipinski, Jed. "Chasing the Cicada: Exploring the Darkest Corridors of the Internet". Mental_Floss. Archived from the original on 25 November 2013. Retrieved 17 December 2012. 
  7. ^ a b c Ernst, Douglas (November 26, 2013). "Secret society seeks world's brightest: Recruits navigate ‘darknet’ filled with terrorism, drugs". The Washington Times. Archived from the original on 25 December 2013. Retrieved 13 December 2013. 
  8. ^ a b Bell, Chris (7 January 2014). "Cicada 3301 update: the baffling internet mystery is back". The Telegraph. Retrieved 10 January 2014. 
  9. ^ a b c Scott, Sam (16 December 2013). "Cicada 3301: The most elaborate and mysterious puzzle of the internet age". Metro. Retrieved 16 December 2013. 
  10. ^ Dewey, Caitlin (12 May 2014). "Five of the Internet's eeriest, unsolved mysteries". The Washington Post. Retrieved 2 May 2014. 
  11. ^ a b Tucker, Daniel (30 December 2013). "Meet the Teenage Codebreaker Who Helped Solve the Cicada 3301 Internet Puzzle". NPR/WNYC New Tech City. Retrieved 13 May 2014. 
  12. ^ Staff, NPR (5 January 2014). "The Internet's Cicada: A Mystery Without An Answer". All Things Considered, National Public Radio. Retrieved 13 May 2014. 
  13. ^ Mihai, Andrei (April 28, 2014). "Cicada 3301: A puzzle for the brightest minds, posted by an unknown, mysterious organization". ZME Science. Retrieved February 26, 2015. 
  14. ^ Andes Online. "PDI advierte sobre nueva modalidad de estafa por internet a través de google". Andes Online. 
  15. ^ Pastebin. "PGP signed Cicada message". 
  16. ^ McEvoy, Maria (30 April 2014). "US Navy attempting to recruit cryptologists through Facebook game". Telegraph. Retrieved 1 May 2014. 
  17. ^ Stanely, T.L. "The U.S. Navy Wants You – To Solve This Puzzle". Mashable. Retrieved 1 May 2014. 
  18. ^ Ngak, Chenda (6 May 2014). "NSA's coded tweet deciphered -- read what it says". CBS News. Retrieved 11 May 2014. 
  19. ^ Planje, Alexa (1 October 2014). "Review: Person Of Interest: "Nautilus"". A.V. Club. Retrieved 1 October 2014. 
  20. ^ Roffman, Marisa. "PERSON OF INTEREST Season 4: Greg Plageman and Jonathan Nolan Tease a Cold War, the Loss of Sanctuary, and More". Give Me My Remote. Retrieved 7 October 2014. 
  21. ^ "Shout Out: Elementary". TV Tropes.