Since the example is short, a likely plaintext could be: Shift :
Try backward by 1: h=7-1=6→g y=24-1=23→x n=13-1=12→m w=22-1=21→v k=10-1=9→j m=12-1=11→l y=24-1=23→x n=13-1=12→m y=24-1=23→x w=22-1=21→v n=13-1=12→m h=7-1=6→g → gxmvj lxmx - - vmg 4 — not English. hynwk myny - -wnh 4
Try : h(8)-5=3→d y(25)-5=20→u n(14)-5=9→j w(23)-5=18→s k(11)-5=6→g → d ujs g — not matching. Let’s decode whole phrase with backward by 7 : h(8)-7=1→b y(25)-7=18→s n(14)-7=7→h w(23)-7=16→q k(11)-7=4→e m(13)-7=6→g y(25)-7=18→s n(14)-7=7→h y(25)-7=18→s w(23)-7=16→q n(14)-7=7→h h(8)-7=1→b 4 unchanged. Since the example is short, a likely plaintext
But note hynwk → shift back by 1 gave gxmvj — maybe it’s a name? Let’s try (equiv forward by 5): h=7-21=-14+26=12→m y=24-21=3→d n=13-21=-8+26=18→s w=22-21=1→b k=10-21=-11+26=15→p → mdsbp no. But note hynwk → shift back by 1
Given the format "hynwk myny - -wnh 4" — maybe the is: "Automatic Caesar cipher detection and decoding for shift values 1–25" The app would take such a string, try all shifts, detect English words by dictionary, and display the most likely plaintext.
h(8) +5 = 13 → m y(25)+5=30→4? out of range — wrap: 30-26=4 → e n(14)+5=19 → t w(23)+5=28→2 → c k(11)+5=16 → q → mte cq ? no.