最古典：Caesar's Cipher Plain a b d e h k 1 m Cipher D E F G H K L M N P Plain n 0 P T t 心 U 0 E y Cipher Q R S T U W X Z A B a b c d e g h k m 0 1 2 3 4 5 6 7 8 9 10 11 12 m 0 p q r t u U U E y 2 13 14 15 16 17 18 19 20 21 22 23 24 25 Cipher=(Plain+3)mod 26 你试试：VKH GLH LV FDVW The die is cast最古典: Caesar’s Cipher Cipher = (Plain + 3)mod 26 你试试: WKH GLH LV FDVW The die is cast