Comment by tptacek
Do I understand part of the complexity of the situation is that Kryptos is in some sense "crackable" (unlike real cryptography), and these two people sleuthed their way to the answer book without solving it? Which is not quite exactly the same thing as them independently working out a solution; it's more like a nicer and more legal version of breaking into the guy's house and stealing it out of his desk drawer?
Can we even determine if what they found is the key, or just the plaintext? The article mentions they recognized bits of plaintext (Berlin clock) in the archives.