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"  (Photo Credit: Jim Sanborn) The cipher for Kryptos, the mysterious sculpture sitting outside CIA headquarters in Langley, Va., has eluded code crackers since it was erected in 1989. Three of the four sections to the puzzle have been solved, but the fourth still has people scratching their heads 25 years later. Sculptor Jim Sanborn is using the sculpture&amp;#039;s anniversary to throw a few clues to sleuths amateur and professional. He just provided the simple word &amp;quot;clock&amp;quot; as a new clue, to follow up his previous clue, &amp;quot;Berlin,&amp;quot; which is said to be hidden in the final 97 letters. Clock is supposed to follow Berlin in the cipher. Once cracked, the whole code becomes a riddle that requires knowledge of the grounds of the CIA headquarters to find \u2026 something. The word could be a reference to the Berlin Uhr clock, an unusual object that is at once a timepiece and a conceptual work of art. Or it could also be a reference to the breaking of the Enigma code. A method conceived by Polish cryptographer Jerzy R\u00F3\u017Cycki using small mechanical rotors became known as the &amp;quot;clock.&amp;quot; This system in turn became the basis for Alan Turing&amp;#039;s Enigma Machines, a forerunner to the computer.  One clue wasn&amp;#039;t enough for code-breakers to decipher this work of art. How about two? Via Wired. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/design/a13292/the-cias-kryptos-sculpture-unsolved-for-25-years-gets-a-new-clue-17451984/>