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).
Next: lshrmwtt l(12)→o(15) s(19)→h(8) h(8)→s(19) r(18)→i(9) m(13)→n(14) w(23)→d(4) t(20)→g(7) t(20)→g(7) → ohsingdg — still nonsense. Download- nwdz lshrmwtt khlyjyt fatht layf ttshrmt...
If you share the full paper excerpt or the exact cipher definition from the paper, I can decode it precisely. But since you labeled it — paper ,
Given the symmetry in ttshrmt , maybe it’s a simple substitution with key derived from "Download" . If you share the full paper excerpt or
Given the presence of "Download-" in plaintext, the rest might be the same cipher applied to a filename or URL. Possibly it's a keyboard shift where each letter is replaced by the key to its left/right on QWERTY.