![]() “Well, it is very close-within days-to when I actually developed that 97-character string,” Sanborn tells NPR’s Mary Louise Kelly. Sanborn released the first clue about 20 years after the sculpture’s unveiling and the second on the 25th anniversary of the fall of the Berlin Wall, an event he says influenced the encryption’s development. The other two hints-“clock” and “Berlin,” released in 20, respectively-sit back-to-back at positions 64 through 69 and 70 through 74. The one-word hint-a decryption of letters 26 through 34-is the third and final clue Sanborn is willing to offer. Now, reports John Schwartz for the New York Times, sculptor Jim Sanborn has released a new clue to the 97-character passage: “Northeast.” Though three of its passages were successfully decoded in the 1990s, Kryptos’ fourth and final section has proven harder to solve than originally anticipated. Inscribed on Kryptos, a sculpture erected on the intelligence agency’s grounds in 1991, the code consists of 865 letters and four question marks punched into a curved wall of copper. A puzzle that codebreakers have yet to crack sits just outside of the CIA’s cafeteria in Langley, Virginia.
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