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More precisely, it is a sculpture located on the grounds of the Central Intelligence Agency (CIA) in Langley, Virginia - at the main entrance to New Headquarters Building (NHB) and in the courtyard between NHB and the Original Headquarters Building (OHB) cafeteria - completed by the American artist James Sanborn, on November 3, 1990.
The Kryptos sculpture comprises four large copper plates, a large vertical S-shaped copper screen resembling a scroll of four encrypted messages, three of which (referred to as K1, K2 and K3) have been solved.
As a community, Kryptos@Home's mission is to crack the elusive K4.
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