When artist Jim Sanborn was commissioned to create a sculpture for the CIA, he created 'Kryptos,' a 10-foot-tall copper structure featuring encrypted messages that have baffled cryptographers since its installation in 1990. Now, the solution to the fourth message, K4, is to be auctioned off, and the bidding has already reached over $200,000.

Sanborn expressed his original intent to demystify the cryptography field through his work, saying, I wanted it to be less esoteric, and I wanted it to be fun. The ongoing mystery of K4 continues to draw the attention of enthusiasts, with one dedicated fan contacting him weekly for two decades in attempts to decode the message.

In a turn of events this September, two Kryptos sleuths stumbled upon Sanborn's original texts at the Smithsonian's Archives of American Art. While this discovery initially raised concerns about the auction, Sanborn ultimately decided to proceed, offering the entire archive in hopes of finding a new keeper for Kryptos.

According to Bobby Livingston from RR Auction, Since its installation in 1990, Kryptos has become a worldwide phenomenon, and the auction reflects this enduring intrigue. The archive includes all necessary materials to decode K4, as well as the original coding charts from the other three messages.

Sanborn also shared that to maintain the sculpture's allure, he does not intend to reveal the methods of decoding, ensuring that the mystery behind K4 continues to captivate generations to come.