KRYPTOS

Opening

In 1990 Jim Sanborn installed Kryptos in the courtyard of CIA Headquarters at Langley: copper, petrified wood, a pool, and four enciphered passages. K1, K2 and K3 yielded to Agency and outside solvers. K4, the last group, is still shut. Sanborn has released clues on odd years. The courtyard is not a toy. People with clearances still walk past a text their own building has not finished.

Kryptos is a sculpture that does intelligence work as art. Keep the solved three and the shut fourth on the same page. Do not pretend K4 is a nation-state secret. It is a sculptor's remaining lock.

The spine of the file is four passages and one still dark. Kryptos is Langley copper. It is not a fifth passage in a vault.

Timeline

1990 installation. 1990s first official solves of K1-K3.

1999 Jim Gillogly publishes the three from outside. Agency solvers had some already.

Sanborn clues on K4 across later years. The fourth stays shut.

Later puzzle culture is later life. The courtyard is first.

Sanborn built a thing that has to be walked around by people who break other people's ciphers for a living. That is the joke and the wound. K4 still shut after three plains is why the courtyard is a file and not only a sculpture garden.

Key figures

Jim Sanborn owns the copper and the remaining lock.

Ed Scheidt owns the cryptographic help on the first three.

Agency and outside solvers own K1-K3.

The courtyard owns the daily walk past an unfinished text.

Physical and documentary trail

On the paper, 1990 onward gives you four hard objects and one closed group.

One: the sculpture as installed at Langley.

Two: the three solved passages.

Three: Sanborn's later clues on K4.

Four: the unsolved fourth. Kryptos, CIA courtyard, Jim Sanborn, 1990, is the originating object.

There is no Agency announcement that K4 is done. There is no fifth panel. There is no claim the first three were never solved.

Three plains and one dark group are the stay-behinds. A Sanborn-signed K4 would finish the lock. Clues are not that plain.

K4 remains unsolved.

Competing explanations

A sculptor's puzzle that is still honest. This is Sanborn. It has three plains. It has one cipher.

An Agency text that only looks like art. Weak against Sanborn owning the clues.

A lock that was meant never to open. Possible. He still feeds clues.

Hybrid caution. Three passages read. The fourth does not. The courtyard still has to walk around it.

Later life of the case

Later clue drops and solver boards. I keep those on the later-life shelf. The copper stays first.

Finding

Jim Sanborn put four ciphers in the CIA courtyard in 1990, three were read, and K4 is still shut. Believe the copper. A sculptor does not invent a Langley wall for a later message board.

What still will not resolve: a plain text of K4 that Sanborn will sign, or a page that shows the fourth was never a real lock. Either one would pin the panel. The proving object is still that last group, held as words, not as another clue.