最古典：Caesar's Cipher Plain b c d e h n Cipher D E F G H K L M P Plain n 0 p t U 0 2 Cipher Q R S T U X Z A B C a b d e h i k m 0 1 2 3 4 5 6 7 8 9 10 11 12 n 0 P 9 u U w E y 13 14 15 1617 18 19 20 21 22 23 2425 Cipher Plain +3mod 26 你试试：NKH GLH LV FDVW The die is cast!最古典: Caesar’s Cipher Cipher = Plain + 3mod 26 你试试: WKH GLH LV FDVW The die is cast!