At the CIA headquarters located in Langley, Virginia, there is a riddle lying in the sun in the middle of the yard. This is a bronze work of Jim Sanborn, an artist who used a hand saw to engrave more than 2,000 characters on the board and create 4 puzzles. It is called Kryptos.
The Kryptos puzzle is located before the CIA headquarters.
The first three parts of the riddle have all been solved, but the fourth part has rocked the world of decipherers; it's not natural that it has become the most famous unsolved code in the world. For 30 years, many decoders from amateur to leading experts have scratched their heads at Jim Sanborn 's artwork.
Every year, the Kryptos decoding community has an annual meeting at Jim Sanborn's studio, listening to the old artist talking, hoping to hear something interesting, some small evidence. Help them decrypt Kryptos. But Mr. Sanborn still smiled mysteriously, refusing to suggest.
Here is a story of a mysterious riddle neatly placed at one of the world's top intelligence agencies: