The solution so far includes a couple of misspellings which Sanborn has said are deliberate.
It gives the coordinates of a spot which seems to be on CIA grounds, and says "only WW" knows the exact location, an apparent reference to William Webster.
It then quotes the diary entry of the archaeologist Howard Carter on finding Tutankhamen's tomb.
After completing the sculpture, Sanborn had to hand Webster an envelope containing the solution, but now suggests he gave neither Webster nor Scheidt, the full story. He insists the fourth passage is decipherable and would not be surprised if it were solved soon. "It's being barraged right now," he said.
Some of the "addicts" are going to remarkable lengths to solve Kryptos.
Gary Phillips, 27, said he had abandoned his software company so that he could devote more time to the code puzzle.
"I can see how some might perceive that I made a sacrifice by closing my business and pursuing Kryptos," Phillips, a Michigan programmer, said.
Sanborn admits he would feel a tinge of regret if Kryptos is solved. He said: "All of us should hope it does survive. There are codes in all our lives that we hope are never deciphered."
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