Kryptos

kryptos K4
Kryptos, a mysterious sculpture by artist Jim Sanborn, has captivated cryptanalysts and puzzle enthusiasts since its installation in 1990 at the CIA headquarters in Langley, Virginia. This enigmatic artwork is renowned for containing a complex encrypted message, split into four parts. While three of these sections have been solved, the fourth remains one of the most alluring unsolved puzzles in the field of cryptography.