: This is a keyboard shift where each letter is typed with the hand moved one key to the left . Let’s test on “zero dark thirty” — no, that doesn’t decode to gibberish. So maybe the gibberish is the plaintext, and the plain English is the cipher? No.
Alternatively, (A↔Z, B↔Y, etc.): d→w, a→z, n→m, l→o, w→d, d→w → “wzmodw” — still nonsense. danlwd fylm zero dark thirty ba zyrnwys chsbydh
If I apply a (each letter replaced by the key to its left on a U.S. QWERTY keyboard): : This is a keyboard shift where each