实验室每日一题

实验室每日一题 2020.11.28

1.解压后先打开txt，里面有一串Brainfuck编码，直接上在线网站https://www.splitbrain.org/services/ook解密，得到压缩包密码。

2.输入密码解压后还是一个压缩包一个txt，txt中是一个c++程序，然后就是写代码逆向：

#include <iostream>
#include <stdlib.h>
using namespace std;
int main()
{
    char v11[4];
    char v12; 
    char v13; 
    char v14; 
    char v15;
    char v16; 
    char v17;
    char v18;
    char v19; 
    char v20;
    char v21; 
    char v22; 
    char v23;  
    v11[0] = 67;
    v23 = 88;
    v11[1] = 90;
    v22 = 155 - v11[1]; 
    v11[2] = 57;
    v21 = 155 - v11[2]; 
    v11[3] = 100;
    v20 = 55;
    v12 = 109;
    v19 = 71;
    v13 = 113;
    v18 = 170 - v13; 
    v14 = 52;
    v17 = 103;
    v15 = 99;
    v16 = 56;
    cout<<v11[0]<<v11[1]<<v11[2]<<v11[3]<<v12<<v13<<v14<<v15<<v16<<v17<<v18<<v19<<v20<<v21<<v22<<v23<<endl;
    system("pause");
	return 0;
}

运行后得到压缩包密码。

3.输入密码后解压出一个txt，里面还是一个程序，这个感觉用python方便一些：

s = [0x66,0x0A,0x6B,0x0C,0x77,0x26,0x4F,0x2E,0x40,0x11,0x78,0x0D,0x5A,0x3B,0x55,0x11,0x70,0x19,0x46,0x1F,0x76,0x22,0x4D,0x23,0x44,0x0E,0x67,6,0x68,0x0F,0x47,0x32,0x4F]
flag = chr(s[0])
for i in range(1,len(s)):
  flag += chr(s[i] ^ s[i-1])
print(flag)

4.运行后得到flag：flag{QianQiuWanDai_YiTongJiangHu}

本文地址：https://blog.csdn.net/wind_sail/article/details/110223524