int __cdecl main(int argc, const char **argv, const char **envp)
{
  char *v3; // rax
  char v5; // [rsp+Fh] [rbp-41h]
  char v6; // [rsp+10h] [rbp-40h]
  unsigned __int64 v7; // [rsp+48h] [rbp-8h]
  v7 = __readfsqword(0x28u);
  printf("Try my base64 program?.....\n>", argv, envp);
  __isoc99_scanf("%20s", &v6);  
    //输入字符串
  v5 = time(0LL);
  srand(v5);
  if ( rand() & 1 )
  {
    v3 = base64_encode(&v6);  
    //对输入的字符串进行base64编码
    puts(v3);
    puts("Is there something wrong?");
  }
  else
  {
    puts("Sorry I think it's not prepared yet....");
    puts("And I get a strange string from my program which is different from the standard base64:");     
    //得到了一段奇怪的字符串与标准base64编码表不同，可知应该不是标准的base64编码表
    puts("d2G0ZjLwHjS7DmOzZAY0X2lzX3CoZV9zdNOydO9vZl9yZXZlcnGlfD==");  
    //一段base64编码
    puts("What's wrong??");
  }
  return 0;
}

#include<iostream> 
using namespace std;
int main(){
  string base64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  for ( int i = 0; i <= 9; ++i ){
      int v1 = base64_table[i];
      base64_table[i] = base64_table[19 - i];
      int result = 19 - i;
      base64_table[result] = v1;
  }
  cout <<base64_table<<endl;
}

import base64
str_1 = "d2G0ZjLwHjS7DmOzZAY0X2lzX3CoZV9zdNOydO9vZl9yZXZlcnGlfD=="
str_base = "TSRQPONMLKJIHGFEDCBAUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
#自定义的编码表
str_zh_base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
#通用编码表
flag = base64.b64decode(str_1.translate(str.maketrans(str_base,str_zh_base)))
print(flag)