omega_cubed writes "The New York Times reports that Jim Sanborn, the sculptor who created the wavy metal pane called Kryptos that sits in front of the CIA in Langley, VA, has gotten tired of waiting for code-breakers to decode the last of the four messages. 'I assumed the code would be cracked in a fairly short time,' [Sanborn] said, adding that the intrusions on his life from people who think they have solved his fourth puzzle are more than he expected. So now, after 20 years, Mr. Sanborn is nudging the process along. He has provided The New York Times with the answers to six letters in the sculpture's final passage. The characters that are the 64th through 69th in the final series on the sculpture read NYPVTT. When deciphered, they read BERLIN."
A method of solution is perfect if we can forsee from the start,
and even prove, that following that method we shall attain our aim.