[kabdib]

No, one-time pads are really unbreakable. You can't tell if the key you generated, which yielded "ATTACK AT DAWN", decrypted to the real message. It might have been "HN != SLASHDOT" -- all decrypts are equally likely.

[benwilber0]

edited thanks. he even explicitly said that it was unbreakable in the article I linked :-).