Download- Fydyw Tjss Ly Lhm Mharm Mn Tht Qb A... Access

Shift backward by 7: f(6)-7 = 25 → y, y(25)-7=18 → r, d(4)-7=23 → w, y(25)-7=18 → r, w(23)-7=16 → p → yrwrp — no.

Take fydyw as first encoded word. If plaintext is there : t(20), h(8), e(5), r(18), e(5). Cipher: f(6), y(25), d(4), y(25), w(23). Differences: t→f = -14 or +12; h→y = +17; e→d = -1; r→y = +7; e→w = +18 — no.

But maybe it's a Caesar shift of 21 (or -5)? Let's check fydyw shift back 5: f(6)-5=1→a, y(25)-5=20→t, d(4)-5=25→y, y→t, w(23)-5=18→r → atytr — no. Download- fydyw tjss ly lhm mharm mn tht qb a...

Check fydyw on QWERTY row: f → left is d, y → left is t, d → left is s, y → t, w → left is q → dtstq — no.

Wait — "Download-" is plaintext. Then "fydyw" — maybe it's "email"? No. Shift backward by 7: f(6)-7 = 25 →

Try could : c(3), o(15), u(21), l(12), d(4). Differences: c→f=+3, o→y=+10, u→d=-17, l→y=+13, d→w=+19 — no.

Another guess: The string after "Download-" might be If we apply ROT-5 (Caesar +5): f(+5)=k, y(+5)=d (wrap: 25+5=30-26=4→d), d→i, y→d, w→b → kdidb — no. Cipher: f(6), y(25), d(4), y(25), w(23)

Try ROT13 (shift by 13): f(6)+13=19 → s, y(25)+13=38 mod26=12 → m, d(4)+13=17 → r, y→m, w(23)+13=36 mod26=10 → k → smrmk — no.