The Kryptos sculpture is a famous cryptographic puzzle located at CIA headquarters in Langley, Virginia. It was created by artist Jim Sanborn in 1990. The sculpture contains four encrypted messages, three of which have been solved. The most famous unsolved message is called "Kryptos."
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: Good documentation is key to understanding both how to use software and how cryptographic puzzles are constructed and can be solved. The Kryptos sculpture is a famous cryptographic puzzle