Keys of Solomon and CIA codes
A decade and a half ago, the American sculptor and artist Jim SANBORN posed a riddle not to anyone, but to the CIA itself. On a monument called “Kryptos” (from Greek “hidden”), which he erected in the courtyard of the main US intelligence agency, Sanborn carved four coded fragments. CIA codebreakers coped with three of them, but the fourth, the shortest, of only 97 characters, was not given to either professionals or ordinary mystery lovers.