Kryptos
https://en.wikipedia.org/wiki/Kryptos
"Kryptos is a sculpute by the American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA) in Langley, Virginia. Since its dedication on November 3, 1990, there has been much speculation about the meaning of the four encrypted messages it bears. Of the four messages, the first three have been solved, while the fourth message remains as one of the most famous unsolved codes in the world. The sculpture continues to be of interest to cryptanalysts, both amateur and professional, who are attempting to decipher the fourth passage. The artist has so far given two clues to this passage.
The ciphertext on the left-hand side of the sculpture (as seen from the courtyard) of the main sculpture contains 869 characters in total : 865 letters and 4 question marks.
In April 2006, however, Sanborn released information stating that a letter was omitted from this side of Kryptos "for aesthetic reasons, to keep the sculpture visually balanced".
There are also three misspelled words in the plaintext of the deciphered first three passages, which Sanborn has said was intentional, and three letters (YAR) near the beginning of the bottom half of the left side are the only characters on the sculpture in superscript.
The right-hand side of the sculpture comprises a keyed Vigenère encryption tableau, consisting of 867 letters.
One of the lines of the Vigenère tableau has an extra character (L), which Sanborn has indicated was accidental.
Sanborn worked with a retiring CIA employee named Ed Scheidt, Chairman of the CIA Office of Communications, to come up with the cryptographic systems used on the sculpture.
Sanborn has revealed that the sculpture contains a riddle within a riddle, which will be solvable only after the four encrypted passages have been deciphered.
He has given conflicting information about the sculpture's answer, saying at one time that he gave the complete solution to the then-CIA director William Webster during the dedication ceremony; but later, he also said that he had not given Webster the entire solution. He did, however, confirm that within the passage of the plaintext of the second message which reads "Who knows the exact location? Only WW.", "WW" was intended to refer to William Webster.
Sanborn also confirmed that should he die before the entire sculpture becomes deciphered, there will be someone able to confirm the solution."
Solution of passage 1
Method :
Vigenère
Keywords: Kryptos,
Palimpsest
BETWEEN SUBTLE SHADING AND THE ABSENCE OF LIGHT LIES THE NUANCE OF IQLUSION
Solution of passage 2
Method :
Vigenère
Keywords: Kryptos,
Abscissa
IT WAS TOTALLY INVISIBLE HOWS THAT POSSIBLE ? THEY USED THE EARTHS MAGNETIC FIELD X THE INFORMATION WAS GATHERED AND TRANSMITTED UNDERGRUUND TO AN UNKNOWN LOCATION X DOES LANGLEY KNOW ABOUT THIS ? THEY SHOULD ITS BURIED OUT THERE SOMEWHERE X WHO KNOWS THE EXACT LOCATION ? ONLY WW THIS WAS HIS LAST MESSAGE X THIRTY EIGHT DEGREES FIFTY SEVEN MINUTES SIX POINT FIVE SECONDS NORTH SEVENTY SEVEN DEGREES EIGHT MINUTES FORTY FOUR SECONDS WEST X LAYER TWO
On April 19, 2006, Sanborn contacted an online community dedicated to the
Kryptos puzzle to inform them that the accepted solution to passage 2 was incorrect. He said that he made an error in the sculpture by omitting an "X" used to separate sentences, for aesthetic reasons, and that the deciphered text that ended "...FOUR SECONDS WEST ID BY ROWS" should actually be "...FOUR SECONDS WEST X LAYER TWO".
The coordinates mentioned in the plaintext:
38°57′6.5″N 77°8′44″W are for a point that is approximately 150 feet southeast of the sculpture.
Solution of passage 3
Method :
Transposition
SLOWLY DESPARATLY SLOWLY THE REMAINS OF PASSAGE DEBRIS THAT ENCUMBERED THE LOWER PART OF THE DOORWAY WAS REMOVED WITH TREMBLING HANDS I MADE A TINY BREACH IN THE UPPER LEFT HAND CORNER AND THEN WIDENING THE HOLE A LITTLE I INSERTED THE CANDLE AND PEERED IN THE HOT AIR ESCAPING FROM THE CHAMBER CAUSED THE FLAME TO FLICKER BUT PRESENTLY DETAILS OF THE ROOM WITHIN EMERGED FROM THE MIST X CAN YOU SEE ANYTHING Q ?
This is a paraphrased quotation from
Howard Carter's account of the opening of the tomb of
Tutankhamun on November 26, 1922, as described in his 1923 book
The Tomb of Tutankhamun. The question with which it ends is asked by
Lord Carnarvon, to which Carter (in the book) famously replied "wonderful things". In the November 26, 1922 field notes, however, his reply was, "Yes, it is wonderful.".
Solution of passage 4
Method(s) : Unknown
No solution to Part 4 has been publicly acknowledged by either Mister Sanborn or Mister Scheidt to be correct.
Clues given
When commenting in 2006 about his error in passage 2, Sanborn said that the answers to the first three passages contain clues to the fourth passage. In November 2010, Sanborn released a clue, publicly stating that "NYPVTT", the 64th-69th letters in passage four, become "BERLIN" after decryption.
Sanborn gave
The New York Times another clue in November 2014: the letters "MZFPK", the 70th-74th letters in passage four, become "CLOCK" after decryption. The 74th letter is K in both the plaintext and ciphertext, meaning that it is possible for a character to encrypt to itself. This means it does not have a weakness, where a character could never be encrypted as itself, that was known to be inherent in the German Enigma Machine. It is believed that the "BERLINCLOCK" plaintext may be a direct reference to the Berlin Clock.
Sanborn further stated that in order to solve passage 4, "You'd better delve into that particular clock," but added, "There are several really interesting clocks in Berlin."