題目鏈接：https://ctf.bugku.com/challenges

題解：

打開題目，觀察這一串數組，發現每一組都是由0和1組成，且長短不一；找到了mrose和ascii的對應表，mrose和ascii對應表鏈接：https://pan.baidu.com/s/1qaE5AjcORTBrI_In6TNaSw

雖然原理倒是懂了，可是不可能一個一個的進行對比啊，太浪費時間咯。因此，無聊至極，寫了一個c#代碼進行轉換，話不多說，源代碼如下:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;namespace ConsoleApp1 {class Program{static void Main(string[] args){string oldstr;oldstr = Console.ReadLine();string []str = oldstr.Split(' ');for (int i = 0; i < str.Length; i++){switch (str[i]){case "01":Console.Write("A"); break;case "1000":Console.Write("B"); break;case "1010":Console.Write("C"); break;case "100":Console.Write("D"); break;case "0":Console.Write("E"); break;case "0010":Console.Write("F"); break;case "110":Console.Write("G"); break;case "0000":Console.Write("H"); break;case "00":Console.Write("I"); break;case "0111":Console.Write("J"); break;case "101":Console.Write("K"); break;case "0100":Console.Write("L"); break;case "11":Console.Write("M"); break;case "10":Console.Write("N"); break;case "111":Console.Write("O"); break;case "0110":Console.Write("P"); break;case "1101":Console.Write("Q"); break;case "010":Console.Write("R"); break;case "000":Console.Write("S"); break;case "1":Console.Write("T"); break;case "001":Console.Write("U"); break;case "0001":Console.Write("V"); break;case "011":Console.Write("W"); break;case "1001":Console.Write("X"); break;case "1011":Console.Write("Y"); break;case "1100":Console.Write("Z"); break;case "01111":Console.Write("1"); break;case "00111":Console.Write("2"); break;case "00011":Console.Write("3"); break;case "00001":Console.Write("4"); break;case "00000":Console.Write("5"); break;case "10000":Console.Write("6"); break;case "11000":Console.Write("7"); break;case "11100":Console.Write("8"); break;case "11110":Console.Write("9"); break;case "11111":Console.Write("0"); break;case "001100":Console.Write("?"); break;case "10010":Console.Write("/"); break;case "100001":Console.Write("-"); break;case "010101":Console.Write("."); break;case "110011":Console.Write(","); break;case "011010":Console.Write("@"); break;case "111000":Console.Write(":"); break;case "101010":Console.Write(";"); break;case "10001":Console.Write("="); break;case "011110":Console.Write("'"); break;case "101011":Console.Write("!"); break;case "001101":Console.Write("_"); break;case "010010":Console.Write("\""); break;case "10110":Console.Write("("); break;case "101101":Console.Write(")"); break;case "0001001":Console.Write("$"); break;case "01000":Console.Write("&"); break;}}}} }

跑下代碼，運行結果如下：

得到：

FLAGM0RSE_CODE_1S_INTEREST1N9!

但是問題來了，提交flag為??FLAG{M0RSE_CODE_1S_INTEREST1N9!}? 時不正確，可能是因為要求答案為小寫吧，于是修改flag為小寫，注意其中有字符“1”、“0”、“9”，不要與字母弄混了喲

所以本題flag：

flag{m0rse_code_1s_interest1n9!}

?

轉載于:https://www.cnblogs.com/Gzu_zb/p/10360370.html

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