If you share the full paper excerpt or the exact cipher definition from the paper, I can decode it precisely.
Maybe the cipher is ? nwdz reversed → zdwn — no. Download- nwdz lshrmwtt khlyjyt fatht layf ttshrmt...
Given the repeated "tt" and "rm" patterns, one common guess is Atbash (A↔Z, B↔Y, etc.) or a Caesar shift. If you share the full paper excerpt or
Given the impossibility of solving without more info, my best guess is the author used to obscure a phrase like "open the file..." or something similar, and "Download-" is plaintext indicating the action. Given the repeated "tt" and "rm" patterns, one
nwdz ROT13: a→n, b→o, but wait, do it properly: n→a, w→j, d→q, z→m → ajqm (no). Actually ROT13: n→a, w→j, d→q, z→m — yes, ajqm . Doesn’t look like English filename.
But since you labeled it — paper , this might be a snippet from an academic paper where the authors used a toy cipher to hide a message. Without more context, the most common simple cipher for such puzzles is (because it’s reversible and produces pseudo-gibberish).
Example: nwdz typed with hands shifted one key left on QWERTY: n → b? No, left of n is b. w→q, d→s, z→a → bqsa — not likely.