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Cracking the Uncrackable Code

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A copper sculpture outside CIA headquarters has kept the world’s best codebreakers stumped for nearly thirty years.

Jim Sanborn’s Kryptos sculpture has stood on the grounds of CIA headquarters in Langley, Virginia, since it was dedicated on November 3, 1990. Three of its four encrypted passages fell to determined codebreakers within a decade. The fourth, a mere 97 characters, has resisted every attempt — by professionals, amateurs, and government cryptanalysts alike — for going on 30 years.

• Sanborn built Kryptos with cryptographer Edward Scheidt, the retired head of the CIA’s Cryptographic Center, structuring the puzzle “like an onion” to get harder with each layer.
• CIA analyst David Stein and NSA cryptanalysts cracked K1, K2, and K3 in the late 1990s using pencil-and-paper work and computer programs, but K4 — just 97 characters — remains unsolved.
• Sanborn has released partial clues over the years, confirming in 2010 that the letters “NYPVTT” decrypt to “BERLIN,” and in 2014 that another segment decodes to “CLOCK.”

A Sculpture Built to Resist Cracking

The sculpture itself is a physical puzzle before it’s even a cryptographic one: an S-shaped copper screen standing roughly 10 to 12 feet tall, perforated with about 1,800 characters. Sanborn didn’t design it alone — he brought in Scheidt specifically to make sure the ciphers held up against the kind of scrutiny only the CIA’s own analysts could bring. The result was intentionally layered, with each section meant to demand a different technique before yielding its message.

That structure paid off almost immediately for the first three passages. K1 and K2 contain poetic, deliberately misspelled prose — “illusion” rendered as “iqlusion” — while K2 buries the geographic coordinates of CIA headquarters alongside a reference to former CIA Director William Webster, encoded simply as “WW.” K3 paraphrases archaeologist Howard Carter’s account of opening King Tutankhamun’s tomb in 1922. Solvers worked through all three using a mix of manual techniques and computing power, closing the book on three-quarters of the sculpture by the late 1990s.

The 97 Characters Nobody Has Broken

K4 is short by design — just 97 characters sit at the bottom of the copper scroll — and that brevity is exactly what makes it brutal. A cipher that long doesn’t give analysts much statistical material to work with, and Sanborn has never confirmed the method used to encrypt it. Cryptologists, hobbyists, and high-profile enthusiasts like game developer and cryptologist Elonka Dunin have spent decades running K4 through every technique they can think of, forming what amounts to a standing global subculture built around one unsolved paragraph.

Webster was the only outside party Sanborn originally trusted with a written solution, sealed in an envelope. But Sanborn later admitted he’d intentionally withheld the exact text of K4 from that submission — meaning even the man entrusted with the answer never actually had the full one.

NYPVTT decrypts to BERLIN.

Sanborn’s Careful Trickle of Clues

Sanborn fields a steady stream of speculative theories at his Maryland studio, and every so often he’ll toss out just enough to keep the search alive without ending it. The 2010 confirmation that “NYPVTT” decodes to “BERLIN” reignited interest across the puzzle-solving community, and the 2014 reveal that another segment decrypts to “CLOCK” did the same. Neither clue has come close to cracking the underlying method, which is precisely the point — Sanborn has said he enjoys keeping everyone guessing far more than he’d enjoy handing over the answer.

The mystery has earned Kryptos a spot alongside the world’s other famous unsolved puzzles, the kind of subject that draws the same audience that pores over the Da Vinci Code or signs up for a real-life escape room hoping to outthink the room. Unlike those, though, there’s no time limit and no guaranteed solution waiting on the other side.

Thirty years after the ribbon-cutting at Langley, Sanborn is still the only person who fully knows what K4 says, and he’s shown no sign of changing that. Every couple of years another word leaks out — BERLIN, then CLOCK — just enough to keep Elonka Dunin and everyone else circling the same 97 characters.