Solution goes on auction for CIA HQ’s Kryptos sculpture that has stumped code breakers for decades CTV NewsCIA sculpture creator selling encryption key to K4 that has baffled cryptographers for 35 years Yahoo News CanadaArtist Releases Final Clues to Solve CIA Kryptos Puzzle Scientific AmericanKryptos’ final code remains unsolved. The CIA sculpture’s creator is auctioning the solution AP News
