An anonymous bidder has won the solution to the final unsolved puzzle of Kryptos, a famous encrypted sculpture at CIA headquarters in Virginia, for $962,500 in an online auction by R.R. Auction. The artist, Jim Sanborn, offered the handwritten code for the fourth message (K4) along with other unpublished items and a prototype, far exceeding the presale estimate of $300,000–$500,000. The sale came after the solution was accidentally leaked to journalists Jarett Kobek and Richard Byrne, who discovered the plaintext in Sanborn's papers at the Smithsonian's Archives of American Art, though they have agreed not to release it.
The auction matters because it resolves a 35-year-old mystery that has captivated a global community of cryptographers and art enthusiasts. Kryptos remains one of the most famous unsolved puzzles in the world, and the sale transfers responsibility for guarding its final secret from the aging artist to a private buyer. The incident also raises questions about the ethics of auctioning a secret that had been inadvertently disclosed, and highlights the tension between artistic legacy, public curiosity, and commercial value in the art market.