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题目链接:https://ctf.bugku.com/challenges
题解:
打开题目,观察这一串数组,发现每一组都是由0和1组成,且长短不一;找到了mrose和ascii的对应表,mrose和ascii对应表链接:https://pan.baidu.com/s/1qaE5AjcORTBrI_In6TNaSw
虽然原理倒是懂了,可是不可能一个一个的进行对比啊,太浪费时间咯。因此,无聊至极,写了一个c#代码进行转换,话不多说,源代码如下:
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;
}
}
}
}
}
跑下代码,运行结果如下:
得到:
FLAGM0RSE_CODE_1S_INTEREST1N9!
但是问题来了,提交flag为 FLAG{M0RSE_CODE_1S_INTEREST1N9!} 时不正确,可能是因为要求答案为小写吧,于是修改flag为小写,注意其中有字符“1”、“0”、“9”,不要与字母弄混了哟
所以本题flag:
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flag{m0rse_code_1s_interest1n9!}