Ever since artist James Sanborn unveiled Kryptos, an outdoor sculpture that sits at CIA headquarters, amateur and professional cryptanalysts have been feverishly attempting to crack the code hidden in its nearly 1800-character message. While they have decoded 3 of the 4 panels of ciphertext in the S-shaped copper artwork, the final panel, known as K4, still defies solution. Only one human being on Earth knows the message of K4: Sanborn. But soon someone else will join the club. Sanborn is putting the answer up for sale.
“I’m auctioning off the 97-character plaintext of K4, which is the secret of Kryptos,” Sanborn tells me. He’s even throwing in a curved metal
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