Kryptos Puzzle

There was an interesting story on NPR this morning about the unsolved fourth passage of the kryptos puzzle on a bronze sculpture at CIA headquarters.

The Encrypted Fourth Passage:

?OBKRUOXOGHULBSOLIFBBWFL
RVQQPRNGKSSOTWTQSJQSSEK
ZZWATJKLUDIAWINFBNYPVTTM
ZFPKWGDKZXTJCDIGKUHUAUEK
CAR

Frequently Asked Questions About Kryptos