In 1990 when the CIA expanded their headquarters in Langley, Virginia they commissioned a sculpture by Jim Sanborn called Kryptos. Sanborn’s slate piece included four encrypted messages to honor the work of the CIA. The first three messages have been decrypted over the years but the 4th has eluded everyone. After ten years Sanbourn has decided to give the public a clue to the decryption. One of the reasons why the 4th code has been so difficult to crack is because it is the second shortest at 97 characters and longer codes provide more material to code crackers to work with. The sculpture has always been popular with the code-busting crowd but it gained world-wide fame when Dan Brown included it in the plot of The Lost Symbol.