10 famous uncracked codes including Kryptos, a sculpture installed at the CIA in Langley, Virgina that has been unsolved since it was installed in 1990.
Since its dedication on November 3, 1990, there has been much speculation about the meaning of the encrypted messages it bears. It continues to provide a diversion for employees of the CIA and other cryptanalysts attempting to decrypt the messages. The ciphertext on one half of the main sculpture contains 869 characters in total, however Sanborn released information in April of 2006 stating that an intended letter on the main half of Kryptos was missing. This would bring the total number of characters to 870 on the main portion. The other half of the sculpture comprises a Vigenère encryption tableau, comprised of 869 characters, if spaces are counted.
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