Kryptos: The Mystery Sculpture At CIA’s Headquarters

(via Amusing Planet)For the past 17 years, a puzzle has stood on the grounds of the CIA’s headquarters in Langley, Virginia, taunting cryptographers, both amateur and professional, including the Agency’s own experts. The sculpture comprises of an S-shaped copper screen surrounded by other elements. On this copper screen, are cut out four ciphers in a jumble of letters spread across four sections. Out of the four encrypted messages only three have been solved.