It is one of the world's most baffling puzzles, the bane of professional cryptologists and amateur sleuths who have spent 15 years trying to solve it.
But the race to find the secrets of Kryptos, a sculpture inside a courtyard at the CIA's heavily guarded headquarters in Langley, Virginia, may be reaching a climax.
And interest has soared since Dan Brown hid references to Kryptos on the cover design for his bestselling novel The Da Vinci Code, and suggested it might play a role in his next novel, The Solomon Key.
The Kryptos sculpture incorporates a coded message made up of thousands of letters punched through a nearly 4m high copper scroll.
Though it was installed where only CIA agents and cryptographers could see it, amateur code-breakers have worked away on transcripts posted on the CIA's website.
Three-quarters of the code has been broken, and the deciphered message so far appears to point to something momentous buried on CIA grounds.
But the clues are obscure and the fourth passage of the Kryptos code -- known as K4 to the addicted -- has remained impenetrable.
However, Elonka Dunin, who runs the most comprehensive website on Kryptos (www.elonka.com/kryptos) said recent activity has surged.
"My baseline was about 500-600 unique visitors a day. But I recently got 30,000 over a 24-hour period," said Dunin, an executive at a Missouri-based internet game company, Simutronics.
No one is more amazed at the sudden excitement than Kryptos's creator, Jim Sanborn, who was hired in 1989 by the CIA director at the time, William Webster. Sanborn worked with a CIA cryptographer, Ed Scheidt, to produce the coded sculpture, consisting of the S-shaped copper scroll, a petrified tree, a water-filled basin and stones marked with fragments of Morse code and a compass. Placing it in the thick of many of the best code-breakers in the world, they never thought it would take this long.
"These were events I thought would take months not years,"Sanborn, a Washington-based sculptor, commented.
The references to Kryptos on the jacket of The Da Vinci Code were only spotted recently. Now Sanborn is worried that the religious and spiritual overtones of Brown's books could settle on his sculpture.
"Somehow I've been drawn into that vortex," he said.
With that in mind, Sanborn is taking precautions.
"I have taken all Kryptos-related material from my house and studio," he said. "The crypto' world has its share of crazies."
It took eight years for the first three Kryptos passages to be cracked, by a CIA officer named David Stein, after a total of 400 hours with pen and paper.
He was hit, he later wrote "by that sweetly ecstatic, rare experience that I have heard described as a `moment of clarity.'"
This being the CIA, the solution was kept a secret, but it was solved separately by Jim Gillogly, a California computer scientist, who published the first three passages in 1999.
They both used the same method, relying on the fact that the English language uses letters with varying frequencies, allowing code-breakers to calculate which ciphers represent which letters.
The fourth passage has been masked to make that impossible. So far, Gillogly, one of America's best cryptologists, says he has spent "a couple of hundred hours spread over six years" on the 97 remaining letters, with no success.
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."
Brazil, the world’s largest Roman Catholic country, saw its Catholic population decline further in 2022, while evangelical Christians and those with no religion continued to rise, census data released on Friday by the Brazilian Institute of Geography and Statistics (IBGE) showed. The census indicated that Brazil had 100.2 million Roman Catholics in 2022, accounting for 56.7 percent of the population, down from 65.1 percent or 105.4 million recorded in the 2010 census. Meanwhile, the share of evangelical Christians rose to 26.9 percent last year, up from 21.6 percent in 2010, adding 12 million followers to reach 47.4 million — the highest figure
A Chinese scientist was arrested while arriving in the US at Detroit airport, the second case in days involving the alleged smuggling of biological material, authorities said on Monday. The scientist is accused of shipping biological material months ago to staff at a laboratory at the University of Michigan. The FBI, in a court filing, described it as material related to certain worms and requires a government permit. “The guidelines for importing biological materials into the US for research purposes are stringent, but clear, and actions like this undermine the legitimate work of other visiting scholars,” said John Nowak, who leads field
Swedish campaigner Greta Thunberg was deported from Israel yesterday, the Israeli Ministry of Foreign Affairs said, the day after the Israeli navy prevented her and a group of fellow pro-Palestinian activists from sailing to Gaza. Thunberg, 22, was put on a flight to France, the ministry said, adding that she would travel on to Sweden from there. Three other people who had been aboard the charity vessel also agreed to immediate repatriation. Eight other crew members are contesting their deportation order, Israeli rights group Adalah, which advised them, said in a statement. They are being held at a detention center ahead of a
‘THE RED LINE’: Colombian President Gustavo Petro promised a thorough probe into the attack on the senator, who had announced his presidential bid in March Colombian Senator Miguel Uribe Turbay, a possible candidate in the country’s presidential election next year, was shot and wounded at a campaign rally in Bogota on Saturday, authorities said. His conservative Democratic Center party released a statement calling it “an unacceptable act of violence.” The attack took place in a park in the Fontibon neighborhood when armed assailants shot him from behind, said the right-wing Democratic Center, which was the party of former Colombian president Alvaro Uribe. The men are not related. Images circulating on social media showed Uribe Turbay, 39, covered in blood being held by several people. The Santa Fe Foundation