The group is known as Cicada 3301. Every January since 2012 an image has been posted to 4chan's "random" message board claiming to be looking for the best of the best in puzzle-solvers. The hidden message in the picture would lead those that solved it to the ones behind Cicada 3301.
There has been plenty of speculation behind the puzzle. Some think it's just "the most elaborate and mysterious puzzle of the internet age," while others think it may be a recruitment tool for the NSA, CIA, MI6, cyber mercenary group, or just a way for banks to test their cryptocurrency. Finally, many just think it's an Alternate Reality Game constructed by some bored geniuses.
Clues for the puzzles have been found in numerous places, from the web, to original music, to physical codes on telephone poles with QR codes.
At least one person has claimed to complete them, but no verification has ever been made.
