[Cryptography] Want to know what those last 97 characters of Kryptos mean?

[John Levine]

Kryptos is a sculpture installed at at CIA headquarters that contains an
encrypted message.  The last 97 characters have never been decoded.

Now Jim Sanborn, who created it, plans to auction off the solution:

  The piece has “destroyed marriages,” he claims. It’s driven “unwanted guests”
  to his doorstep. Some aspiring code crackers have even “threatened my life,”
  Sanborn says, prompting the artist to outfit his home with panic buttons, motion
  sensors and cameras.

  But after 35 years guarding the work’s secrets and dealing with the drama that
  comes with it, Sanborn is ready to hand over the code. In November, he plans to
  auction off the coveted solution to the final passage, known as K4, at a sale
  coinciding with his 80th birthday. ...

https://www.washingtonpost.com/entertainment/art/2025/08/14/kryptos-code-k4-solution-jim-sanborn-auction/

R's,
John