前几天的XCTF最后一场终于打完了,三场比赛下来对逆向部分的大概感觉是从第一场的啥都不会做(一道lua+一道apk)到后来的终于能有参与度,至少后两场的题目都是pc逆向,虽然特殊架构但好歹能做(tcl。
本文是三场XCTF所有逆向题目的wp+复现整理。赛中拿到了7/10的flag,很多是跟着队里的大佬做出来的(tqltql),这边就试着独立复现一下,至少打完应该长长记性(
P.S. 不会的题暂时标了【TODO】,等wp出了回来填坑= =
比赛官网:XCTF高校网络安全专题挑战赛
【TODO】
lua是第一次接触,.lua文件没法反编译,估计虚拟机被魔改了
【TODO】
apk逻辑没看出来,废了废了
真·送分题,可惜当时要上课没来得及抢一血(下午2点放题绝了
老传统走迷宫
mips架构。
ida反编译以后可以看到
v4是我们输入的字符串,很明显是迷宫逻辑,上下左右用wasd走,迷宫存在dword_100111F0里。
sub_10000744()这个初始函数是用来找起点用的(就是迷宫中3所在的地方,在后面可以看到3其实表示的是当前位置)。
这里也可以看到应该有多个迷宫(dword_10011D10是用来表示第几个迷宫的,且<=2,一个迷宫有225个数)+一个迷宫宽为15=三个迷宫,每个迷宫为15*15。
然后就是下面的四个函数,随便挑一个出来(比如sub_10000D28())可以看到
很明显是个往右走的函数,3表示当前位置,并把上一个当前位置标为1(可走路径)。并且可以看到终点是4,就是说我们要把每个迷宫从3走到4。
dump迷宫数组,写脚本打印迷宫:
aMap=[1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 3, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0] for i in range(45): for j in range(15): if aMap[i*15+j]==0: tmp='*' elif aMap[i*15+j]==1: tmp='.' elif aMap[i*15+j]==3: tmp='@' else: tmp='#' print(tmp,end='') print() if i==14 or i==29: print()
可以看到打印出了三个迷宫,为了看得清楚所以选用几个特定字符打印。
.....********** .....*@*.****** .....*.*.****** .....*.*.****** .....*.*.....** .....*.*****.** .....*.*****.** .....*.*****..* .....*........* .....********#* ............... ............... ............... ............... ............... #sssssssddddddds ..************* ..*@*....****** ..*.****.****** ..*.****.****** ..*..***.....** ..*..*******.** ..*..*******.** ..*..*****....* ..*..*****.**.* ..*..*****.**** ..*......*.*..* ..*...........* ..***********#* ............... ............... #ssssssssssdddddddddds *************** *@..*********** ***.*...******* ***...*.******* ****.**.******* *..*.**.******* **...**.******* *******.******* *******....**** **********.**** **********.**** **********.**** **********....* *************.* *************#* #ddssddwddssssssdddssssdddss
走迷宫,然后把路径拼起来,根据提示转md5,get flag。
(有个疑惑哈,第二个迷宫理论上说就算是最短路也有多解?是题目出锅了还是我哪里看漏了= =
(再补一句,题目似乎甚至没要求最短路???神奇.jpg
import hashlib s=b"sssssssdddddddsssssssssssddddddddddsddssddwddssssssdddssssdddss" print("flag{%s}"%hashlib.md5(s).hexdigest())
flag{999ea6aa6c365ab43eec2a0f0e5968d5}
把题目文件拖进ida,搜索字符串能看到
猜测是pyinstaller打包的文件。
也就是这个题让我突然发现pyinstaller还能打包成elf的,于是比赛结束以后赶紧把之前总结的解包指南更新了:RE套路 - 关于pyinstaller打包文件的复原 | c10udlnk_Log。
走流程解包,得到python源码。
看到这种混淆变量名,果断替换成ida style变量名(。
放一下源码:
# uncompyle6 version 3.7.4 # Python bytecode 3.8 (3413) # Decompiled from: Python 2.7.18 (v2.7.18:8d21aa21f2, Apr 20 2020, 13:25:05) [MSC v.1500 64 bit (AMD64)] # Warning: this version of Python has problems handling the Python 3 "byte" type in constants properly. # Embedded file name: main.py # Compiled at: 1995-09-28 00:18:56 # Size of source mod 2**32: 257 bytes import random, codecs, sys, time, pygame from pygame.locals import * from collections import deque SCREEN_WIDTH = 600 SCREEN_HEIGHT = 480 SIZE = 20 LINE_WIDTH = 1 flag = 'flag{this is a fake flag}' SCOPE_X = (0, SCREEN_WIDTH // SIZE - 1) SCOPE_Y = (2, SCREEN_HEIGHT // SIZE - 1) FOOD_STYLE_LIST = [(10, (255, 100, 100)), (20, (100, 255, 100)), (30, (100, 100, 255))] LIGHT = (100, 100, 100) DARK = (200, 200, 200) BLACK = (0, 0, 0) RED = (200, 30, 30) BGCOLOR = (40, 40, 60) def print_text(v1, v2, v3, v4, v5, fcolor=(255, 255, 255)): v6 = v2.render(v5, True, fcolor) v1.blit(v6, (v3, v4)) def init_snake(): v7 = deque() v7.append((2, SCOPE_Y[0])) v7.append((1, SCOPE_Y[0])) v7.append((0, SCOPE_Y[0])) return v7 def create_food(v8): v9 = random.randint(SCOPE_X[0], SCOPE_X[1]) v10 = random.randint(SCOPE_Y[0], SCOPE_Y[1]) while (v9, v10) in v8: v9 = random.randint(SCOPE_X[0], SCOPE_X[1]) v10 = random.randint(SCOPE_Y[0], SCOPE_Y[1]) return ( v9, v10) def get_food_style(): return FOOD_STYLE_LIST[random.randint(0, 2)] DEFAULT_KEY = u'Y\xf3\x02\xc3%\x9a\x820\x0b\xbb%\x7f~;\xd2\xdc' def rc4(v11, key=DEFAULT_KEY, skip=1024): v12 = 0 v13 = bytearray([v14 for v14 in range(256)]) v12 = 0 for v15 in range(256): v12 = (v12 + v13[v15] + ord(key[(v15 % len(key))])) % 256 v16 = v13[v15] v17 = v13[v12] v13[v15] = v13[v12] v13[v12] = v16 else: v12 = 0 v18 = 0 v19 = [] if skip > 0: for v15 in range(skip): v12 = (v12 + 1) % 256 v18 = (v18 + v13[v12]) % 256 v13[v12], v13[v18] = v13[v18], v13[v12] for v20 in v11: v12 = (v12 + 1) % 256 v18 = (v18 + v13[v12]) % 256 v13[v12], v13[v18] = v13[v18], v13[v12] v21 = v13[((v13[v12] + v13[v18]) % 256)] v19.append(chr(ord(v20) ^ v21)) else: return ''.join(v19) def func(v22): v23 = rc4(v22) if v23.encode('utf-8').hex() == '275b39c381c28b701ac3972338456022c2ba06c3b04f5501471c47c38ac380c29b72c3b5c38a7ec2a5c2a0': return 'YOU WIN' return 'YOU LOSE' def main(): pygame.init() v24 = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT)) pygame.display.set_caption(u'\u8d2a\u5403\u86c7') v25 = pygame.font.SysFont('SimHei', 24) v26 = pygame.font.Font(None, 72) v27, v28 = v26.size('GAME OVER') v29 = True v30 = init_snake() v31 = create_food(v30) v32 = get_food_style() v33 = (1, 0) v34 = True v35 = False v36 = 0 v37 = 0.5 v38 = v37 v39 = None v41 = False for v40 in pygame.event.get(): if v40.type == QUIT: sys.exit() elif v40.type == KEYDOWN: if v40.key == K_RETURN: if v34: v35 = True v34 = False v29 = True v30 = init_snake() v31 = create_food(v30) v32 = get_food_style() v33 = (1, 0) v36 = 0 v39 = time.time() elif v40.key == K_SPACE: if not v34: v41 = not v41 elif v40.key in (K_w, K_UP): if v29: v33 = v33[1] or (0, -1) v29 = False elif v40.key in (K_s, K_DOWN): if v29: v33 = v33[1] or (0, 1) v29 = False elif v40.key in (K_a, K_LEFT): if v29: if not v33[0]: v33 = (-1, 0) v29 = False elif v40.key in (K_d, K_RIGHT): if v29: if not v33[0]: v33 = (1, 0) v29 = False else: v24.fill(BGCOLOR) for v42 in range(SIZE, SCREEN_WIDTH, SIZE): pygame.draw.line(v24, BLACK, (v42, SCOPE_Y[0] * SIZE), (v42, SCREEN_HEIGHT), LINE_WIDTH) else: for v43 in range(SCOPE_Y[0] * SIZE, SCREEN_HEIGHT, SIZE): pygame.draw.line(v24, BLACK, (0, v43), (SCREEN_WIDTH, v43), LINE_WIDTH) else: v44 = v34 or time.time() if v44 - v39 > v38 and not v41: v29 = True v39 = v44 v45 = (v30[0][0] + v33[0], v30[0][1] + v33[1]) if v45 == v31: v30.appendleft(v45) v36 += v32[0] v38 = v37 - 0.03 * (v36 // 100) v31 = create_food(v30) v32 = get_food_style() else: if SCOPE_X[0] <= v45[0] <= SCOPE_X[1]: if SCOPE_Y[0] <= v45[1] <= SCOPE_Y[1]: if v45 not in v30: v30.appendleft(v45) v30.pop() else: v34 = True if not v34: pygame.draw.rect(v24, v32[1], (v31[0] * SIZE, v31[1] * SIZE, SIZE, SIZE), 0) for v46 in v30: pygame.draw.rect(v24, DARK, (v46[0] * SIZE + LINE_WIDTH, v46[1] * SIZE + LINE_WIDTH, SIZE - LINE_WIDTH * 2, SIZE - LINE_WIDTH * 2), 0) else: print_text(v24, v25, 30, 7, f"speed: {v36 // 100}") print_text(v24, v25, 450, 7, f"score: {v36}") if v36 >= 5192296858534827628530496329220096: v47 = flag print_text(v24, v26, (SCREEN_WIDTH - v27) // 2, (SCREEN_HEIGHT - v28) // 2, func(v47), RED) if v34: if v35: print_text(v24, v26, (SCREEN_WIDTH - v27) // 2, (SCREEN_HEIGHT - v28) // 2, 'GAME OVER', RED) pygame.display.update() if __name__ == '__main__': main() # okay decompiling main.pyc
可以看到最后getflag这里(func())的程序逻辑就一个rc4加密,由rc4的特性可知加密和解密流程相同,故复用程序中的rc4()来得到flag。
uncompyle反编译出来的源码是python3,但是题目本身的源码是python2,注意编码问题。
关于编码问题,可以看:
Unicode之痛 — PyCoder's Weelky CN
关于python2中的unicode和str以及python3中的str和bytes - 明王不动心 - 博客园
这里因为反编译做了转换成python3的处理,所以脚本用python3写。
DEFAULT_KEY = u'Y\xf3\x02\xc3%\x9a\x820\x0b\xbb%\x7f~;\xd2\xdc' def rc4(v11, key=DEFAULT_KEY, skip=1024): v12 = 0 v13 = bytearray([v14 for v14 in range(256)]) v12 = 0 for v15 in range(256): v12 = (v12 + v13[v15] + ord(key[(v15 % len(key))])) % 256 v16 = v13[v15] v17 = v13[v12] v13[v15] = v13[v12] v13[v12] = v16 else: v12 = 0 v18 = 0 v19 = [] if skip > 0: for v15 in range(skip): v12 = (v12 + 1) % 256 v18 = (v18 + v13[v12]) % 256 v13[v12], v13[v18] = v13[v18], v13[v12] for v20 in v11: v12 = (v12 + 1) % 256 v18 = (v18 + v13[v12]) % 256 v13[v12], v13[v18] = v13[v18], v13[v12] v21 = v13[((v13[v12] + v13[v18]) % 256)] v19.append(chr(ord(v20) ^ v21)) else: return ''.join(v19) # def func(v22): # v23 = rc4(v22) # if v23.encode('utf-8').hex() == '275b39c381c28b701ac3972338456022c2ba06c3b04f5501471c47c38ac380c29b72c3b5c38a7ec2a5c2a0': # return 'YOU WIN' # return 'YOU LOSE' # -=-=-=以上所有为源码中原函数-=-=-= cipher='275b39c381c28b701ac3972338456022c2ba06c3b04f5501471c47c38ac380c29b72c3b5c38a7ec2a5c2a0' flag=bytes.fromhex(cipher).decode('utf-8') print(rc4(flag))
flag{snake_bao_is_really_lucky}
【TODO】
这个题感觉大概知道怎么做,但就是不会啊(等wp...
贴一下当时的想法,看了看逻辑只有sprintf这种函数,除此以外没有别的可以改写内存数据的操作了。
动态调试跟了一下,猜测是sprintf格式化字符串漏洞写入?
Introduction to format string exploits
sprintf - stm32学习中 - 博客园
pwn太菜了还没搞懂要怎么往output那里写(虽然这是逆向题orz
setup函数那里有一些format的初始化,主要是loop()那里,控制input(输入的字符串,全部为可见字符且长度>11),来改变使得output!=原来的output且output-1==48('0')。
难得有一场ak逆向了!(虽然有大佬带着
有三道题都是卡着四血交,实惨TAT
用file命令可以看到是MS Windows HtmlHelp Data文件(即.chm),查看文件头也可以知道。
所以添加后缀名.chm。
关于chm文件有一个常用的反编译器ChmDecompiler,可以释放CHM里面的全部源文件(包括网页、文本、图片、CHM、ZIP、EXE等全部源文件),并且完美地恢复源文件的全部目录结构 (摘抄的简介。
所以用ChmDecompiler打开re.chm,解压缩,可以看到目录下出现一个包含四个文件的文件夹(其实源文件只有三个,.hhp是ChmDecompiler自动生成的)。
一个一个翻可以看到doc.htm里有一段奇怪的Item1。
大概可以看到是powershell的语法?(感觉像win后门,这么多no的参数
查了一下其实就是把后面那大段进行base64解码而已,用wsl解一下base64有
然后得到了一段.NET代码(白字)。
通过查微软文档可以知道,这里是把base64解码以后的字符进行Deflate解压的过程,所以用脚本把中间那段base64解码,并整理输出。
import base64 import zlib def deflate(data): try: return zlib.decompress(data, -zlib.MAX_WBITS) except zlib.error: return zlib.decompress(data) code='TY5BC4IwGIbvgv9hjB2McJhEhNChJMGTkN2qg7qvFHQT/bL575vpoV2/53n2skJJBInkQG5xwqOqhkcQXCATx7q+gkaHsvYj7kIVvCgburItVgm9MTxbVB5LATp5OlQvb6IMV0LdQvdPpu+8x66SL2eOrMl+Ck7naUA69ggND5UcoEOzI+pUc8p62G3TRZubv34K6IbLespADoGR27vv+R7HpqXzt8Q9y0IJI5N8RLCtLw==' de_code=deflate(base64.b64decode(code)).decode() for x in de_code.split('\r\n'): print(x)
很明显的逻辑了,把doc.chm(应该是原来的re.chm)中"xxxxxxxx"后面的部分提取出来,还是用base64解码得到文件。
把这后面的内容手动复制出来到cont.txt里,进行base64解码,最后存在theFile中。
base64 -d cont.txt > theFile
查看theFile可以猜测是exe(毕竟最开始给的就是有powershell指令的base64),把文件头补上,并改后缀名(即theFile.exe)。
用ida打开,通过FindCrypt插件可以看到AES,跟过去能看到AES加密时的S盒(其实这里前两个都是S盒,第三个是逆S盒),猜测用到了AES加密。
往上回溯找到主函数
显然,这里是AES加密过程,sub_180001100()是密钥拓展过程,sub_1800015B0()是AES加密。
关于逆向中各种常见密码的记录,指路:对称加密算法&&Hash算法 文档 | feng's blog
看了一下感觉是原装无魔改的AES,密文密钥都给了,那就直接写脚本解密。
注意这里是以整数形式给出的,别忘了小端序。
from Crypto.Cipher import AES from binascii import * arr=[0x16157E2B,0xA6D2AE28,0x8815F7AB,0x3C4FCF09] key="" for i in range(4): key=hex(arr[i])[2:]+key key=unhexlify(key)[::-1] #注意小端序的问题 tmp=0x46C42084AA2A1B56E799D643453FF4B5 cipher=unhexlify(hex(tmp)[2:])[::-1] enc=AES.new(key,AES.MODE_ECB) print(enc.decrypt(cipher))
flag{youcangues}
mips架构。
加载进ida以后,通过字符串回溯找到主函数。
可以看到很明显的sub_401134()这个check,先往这里面看。
看到是一个疑似maze的逻辑(
不过sub_400FA8()点进去以后可以看到是swap的功能
所以应该不是maze,是一个以交换为主的逻辑。
至于dword_4A0010,可以看到是一个九个数的数组。
v4和v5的出处在switch逻辑上面一点
可以看到最后(v4,v5)其实表示了数组里0的位置,且数组实际可以看成是3*3。
即:
4 0 3 7 2 6 8 1 5
最后sub_400FFC()的检查逻辑:
实际上就是要让这个3*3等于
1 2 3 4 5 6 7 8 0
把0看成空位的话,很容易就想到3*3的华容道了。
(或者玩算法的小伙伴可能对八数码问题这个名字更熟悉?
有本事下次出数织啊!20*20我都给你火速解出来(来自数织爱好者的吐槽)
这里实际上是求最短能得到的路径(15步),懒得想了,直接去网上抓了个现成代码下来改了改。
八数码问题的代码见:八数码问题-A*(AStar)算法实现_Broken Geeker-CSDN博客
#include
得到每一步的情况,进而根据switch写出路径。
第 0 步 ------------------------------- 4 0 3 7 2 6 8 1 5 ------------------------------- 第 1 步 ------------------------------- 4 2 3 7 0 6 8 1 5 ------------------------------- 第 2 步 ------------------------------- 4 2 3 7 1 6 8 0 5 ------------------------------- 第 3 步 ------------------------------- 4 2 3 7 1 6 8 5 0 ------------------------------- 第 4 步 ------------------------------- 4 2 3 7 1 0 8 5 6 ------------------------------- 第 5 步 ------------------------------- 4 2 0 7 1 3 8 5 6 ------------------------------- 第 6 步 ------------------------------- 4 0 2 7 1 3 8 5 6 ------------------------------- 第 7 步 ------------------------------- 4 1 2 7 0 3 8 5 6 ------------------------------- 第 8 步 ------------------------------- 4 1 2 7 5 3 8 0 6 ------------------------------- 第 9 步 ------------------------------- 4 1 2 7 5 3 0 8 6 ------------------------------- 第 10 步 ------------------------------- 4 1 2 0 5 3 7 8 6 ------------------------------- 第 11 步 ------------------------------- 0 1 2 4 5 3 7 8 6 ------------------------------- 第 12 步 ------------------------------- 1 0 2 4 5 3 7 8 6 ------------------------------- 第 13 步 ------------------------------- 1 2 0 4 5 3 7 8 6 ------------------------------- 第 14 步 ------------------------------- 1 2 3 4 5 0 7 8 6 ------------------------------- 第 15 步 ------------------------------- 1 2 3 4 5 6 7 8 0 ------------------------------- 6 左 2 上 4 右 8 下 // 884226886224488
路径为“884226886224488”。
接下来看主函数里check上面的部分,看到sub_409070()实际上是一个scanf,而dword_4A1B60是我们的输入,也就是最后的flag,中间对输入进行处理以后才得到“884226886224488”这个字符串。
在里面翻可以翻到一个sub_400B58(),猜测是base64换表编码。
于是尝试写脚本编码。
import base64 b64table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" mytable="" offset=-18 for i in range(len(b64table)): mytable+=b64table[(i+offset)%len(b64table)] text="884226886224488".encode() cipher=base64.b64encode(text).decode().translate(str.maketrans(b64table,mytable)) print(cipher)
试试能不能过check。
wsl运行:(要装qemu才能执行,毕竟特殊架构。
cp $(which qemu-mips) . ./qemu-mips -L . ./puzzle
执行mips程序,输入脚本中解出的字符串,发现成功了,get flag。
flag{8xOi6R2k8xOk6R2i7xOm}
arm架构。
照例通过字符串回溯找到主函数。
v1是key,v9是输入的flag,对输入的限制就是长度为42且头尾是“flag{”和“}”。
动态调一下可以发现,sub_27770()这个函数实际上是把unk_723A0数组里的42个数据复制到v8里。
./qemu-arm -L ./ -g 12345 ./aRm
(Debugger选Remote GDB debugger,把端口号填上就好,其余配置具体见RE套路 - 关于使用IDA 7.0前端进行的动态调试 | c10udlnk_Log中调试elf部分。
现在我们未知的数就剩v5和v6了,v5要看sub_1714C()的输出,v6这里相当于是42条42元一次方程组(输入未知的情况下)。
而sub_105B4()是输出42个结果,于是可以知道只要输出了output.txt里的42个数就是正确的flag了。
由于前面有一个sub_169AC(key),这边又是一个无参的sub_1714C()+1,于是猜测是srand(seed)和rand()。
为了证明猜测,多次运行程序输入同一个key和相同/不同的flag,发现每一次的v5是一样的,结合rand()的伪随机性,确定这就是随机函数。
由于key只有一字节(0~255),干脆直接爆破。把output.txt的数据读入,用sympy库解方程,只要第一个解x0等于ord('f')^v8[0]=102^0xA0=198
,就说明这个key有极大可能性是正确的key。
当然,在此之前,我们得先知道每一次的v5(即方程的系数)是多少。
于是hook函数,在v5生成之后复用程序原来就有的print函数及格式符,把每次生成的v5都打印出来。
还记得有个函数是可以输出八位十六进制数的吧,就是那个sub_105B4(),我们可以用这里面的printf,然后把调用这个函数的地方nop掉(目标要明确,现在是为了爆破key,没必要管程序的正常性hahah)。
本来是想自己堆个调用printf出来的,不知道为什么keypatch对
LDR R0, =a08x
解释不了,于是只好绕个小路了。
转到汇编窗口,记一下这里的loc,等会要跳过来的。
看回去原来二重循环里出v5那个地方
这几条语句的意思就是f5里面的那行v5 = (unsigned __int8)(sub_1714C() + 1);
,我们从再下一行开始改。
注意可以改的范围在蓝框这里,这是我们不需要的v6[j] += (unsigned __int8)v9[k] * v5;
,在这个范围里可以尽情修改,剩下的nop掉。
用keypatch直接输入汇编,patch后面的语句为
(其实就是改了一行B loc_105D4
,剩下的直接Fill with NOPs就好)
接下来去往loc_105D4,改造一下。
我们知道,现在R3寄存器里实际上存的是v5的值,我们调用printf直接输出R3的值就能达成目标。
在ARM汇编里,函数传参用R0、R1……所以我们这里给R1一个R3的值就好。
这里本来就是MOV R1, R3
不用改,所以直接把前面nop掉。
因为v5那里是取(unsigned __int8),所以把这里改一下,把"%08x"改成"%02x",就是出来的v5。
别忘了后面还要跳回去,找到地址:
patch:
记得把调用sub_105B4()的地方也nop掉。
最后把patch的字节保存一下。
运行测试一下,有:
ok,hook成功,开始爆破。
用pexpect进行批量的自动化交互见:【wp】2020ChaMd5圣诞题 | c10udlnk_Log
多亏了周五做的那个题,才有了这个题的爆破脚本(Doge。
import pexpect from sympy import * data=[] with open('output.txt','r') as f: tmp=f.read().split('\r\n') data=[int(x,16) for x in tmp] src=[0xA0, 0xE4, 0xBA, 0xFB, 0x10, 0xDD, 0xAC, 0x65, 0x8D, 0x0B, 0x57, 0x1A, 0xE4, 0x28, 0x96, 0xB3, 0x0C, 0x79, 0x4D, 0x80, 0x90, 0x99, 0x58, 0xFE, 0x50, 0xD3, 0xF9, 0x3C, 0x0F, 0xC1, 0xE3, 0xA6, 0x39, 0xC3, 0x28, 0x75, 0xF8, 0xC9, 0xC8, 0xCD, 0x78, 0x26] flag='flag{000000000000000000000000000000000000}' var=[] for num in range(42): exec("x"+str(num)+"=Symbol('x'+str(num))") var.append("x"+str(num)) #创建42个变量x0~x41 for i in range(256): r=pexpect.spawn('./qemu-arm -L ./ ./aRm_getRand') r.sendline(str(i)) r.sendline(flag) r.readline() r.readline() rand=[] for j in range(42*42): s=r.readline() rand.append(int(str(s)[2:-5],16)) r.wait() exper=[] for j in range(42): anEx="" for k in range(42): anEx+=str(rand[j*42+k])+"*"+var[k]+"+" anEx=anEx[:-1]+"-"+str(data[j]) exper.append(anEx) res=solve(exper,var) print(str(i)+": ") print(res.values())
爆破得到:
可知key是82,而v9在xor以后的数组也爆出来了,简单xor得flag:
arr=[0xA0, 0xE4, 0xBA, 0xFB, 0x10, 0xDD, 0xAC, 0x65, 0x8D, 0x0B, 0x57, 0x1A, 0xE4, 0x28, 0x96, 0xB3, 0x0C, 0x79, 0x4D, 0x80, 0x90, 0x99, 0x58, 0xFE, 0x50, 0xD3, 0xF9, 0x3C, 0x0F, 0xC1, 0xE3, 0xA6, 0x39, 0xC3, 0x28, 0x75, 0xF8, 0xC9, 0xC8, 0xCD, 0x78, 0x26] x=[198, 136, 219, 156, 107, 228, 152, 7, 239, 63, 97, 127, 134, 5, 247, 131, 109, 75, 96, 180, 241, 173, 57, 211, 49, 224, 157, 9, 34, 243, 129, 199, 1, 244, 31, 17, 157, 171, 252, 249, 64, 91] flag="" for i in range(42): flag+=chr(x[i]^arr[i]) print(flag)
flag{94bb46eb-a0a2-4a4a-a3d5-2ba877deb448}
arm架构,没环境调不动,只能硬看了XD。这题有好多奇怪的函数,而且通过伪代码跟的话就能看到函数套函数套函数……所以基本靠猜出来的(
继续通过字符串回溯找主函数。
根据参数猜测,sub_1400023C8()是strcmp()的作用,我们需要让v9="KIMLXDWRZXTHXTHQTXTXHZWC"。
再往上走,sub_1400015B0这个函数调用了v9,于是跟进去看功能。
感觉是某种加密,以相邻的两字符为一组,对这两个字符做相同的操作,再做后续处理。
跟进sub_1400012B8()里看,可以看到大概是一个搜索的过程
如果不等于-1就说明在表中找到了这个元素,然后返回一个索引(?
再往下看好像就看不太懂了,然后就是玄学的猜猜猜= =
回去看string可以看到一个这个,猜测是密钥表之类的?
往上回溯也看不到什么线索,不过可以发现这25个数字刚好没有相同的。http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E4%BA%BA%E6%B0%91%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
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http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E4%BA%BA%E6%B0%91%E5%85%AC%E5%AE%89%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%9B%BD%E9%99%85%E5%85%B3%E7%B3%BB%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BD%93%E8%82%B2%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%A4%AE%E9%9F%B3%E4%B9%90%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E9%9F%B3%E4%B9%90%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%A4%AE%E7%BE%8E%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%A4%AE%E6%88%8F%E5%89%A7%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E6%88%8F%E6%9B%B2%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%94%B5%E5%BD%B1%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E8%88%9E%E8%B9%88%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%A4%AE%E6%B0%91%E6%97%8F%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E6%94%BF%E6%B3%95%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8D%8E%E5%8C%97%E7%94%B5%E5%8A%9B%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%8D%8E%E5%A5%B3%E5%AD%90%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BF%A1%E6%81%AF%E7%A7%91%E6%8A%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E7%9F%BF%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E7%9F%B3%E6%B2%B9%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E5%9C%B0%E8%B4%A8%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E8%81%94%E5%90%88%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%9F%8E%E5%B8%82%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E9%9D%92%E5%B9%B4%E6%94%BF%E6%B2%BB%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E9%A6%96%E9%92%A2%E5%B7%A5%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E5%8A%B3%E5%8A%A8%E5%85%B3%E7%B3%BB%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%90%89%E5%88%A9%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E9%A6%96%E9%83%BD%E5%B8%88%E8%8C%83%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%B7%A5%E5%95%86%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E9%82%AE%E7%94%B5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%B7%A5%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E8%AD%A6%E5%AF%9F%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%AC%AC%E4%BA%8C%E5%A4%96%E5%9B%BD%E8%AF%AD%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E7%A7%91%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E7%A4%BE%E4%BC%9A%E7%A7%91%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%B7%A5%E4%B8%9A%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BF%A1%E6%81%AF%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%94%B5%E5%AD%90%E7%A7%91%E6%8A%80%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BA%AC%E5%8C%97%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BA%A4%E9%80%9A%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E9%9D%92%E5%B9%B4%E6%94%BF%E6%B2%BB%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%86%9C%E4%B8%9A%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E6%94%BF%E6%B3%95%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E8%B4%A2%E8%B4%B8%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%8C%97%E5%A4%A7%E6%96%B9%E6%AD%A3%E8%BD%AF%E4%BB%B6%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%BB%8F%E8%B4%B8%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%BB%8F%E6%B5%8E%E6%8A%80%E6%9C%AF%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E6%88%8F%E6%9B%B2%E8%89%BA%E6%9C%AF%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E6%B1%87%E4%BD%B3%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%A7%91%E6%8A%80%E7%BB%8F%E8%90%A5%E7%AE%A1%E7%90%86%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%A7%91%E6%8A%80%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%9F%B9%E9%BB%8E%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%BB%8F%E6%B5%8E%E7%AE%A1%E7%90%86%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%8A%B3%E5%8A%A8%E4%BF%9D%E9%9A%9C%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%A4%BE%E4%BC%9A%E7%AE%A1%E7%90%86%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E8%89%BA%E6%9C%AF%E4%BC%A0%E5%AA%92%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BD%93%E8%82%B2%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E4%BA%A4%E9%80%9A%E8%BF%90%E8%BE%93%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E5%8D%AB%E7%94%9F%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%BD%91%E7%BB%9C%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8D%97%E5%BC%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%A7%91%E6%8A%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B7%A5%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E6%B0%91%E8%88%AA%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%90%86%E5%B7%A5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%86%9C%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%8C%BB%E7%A7%91%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%B8%AD%E5%8C%BB%E8%8D%AF%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B8%88%E8%8C%83%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%B8%88%E8%8C%83%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%A4%96%E5%9B%BD%E8%AF%AD%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%95%86%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E8%B4%A2%E7%BB%8F%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%BD%93%E8%82%B2%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E9%9F%B3%E4%B9%90%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%BE%8E%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%9F%8E%E5%BB%BA%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%A4%A9%E7%8B%AE%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%B8%AD%E5%BE%B7%E5%BA%94%E7%94%A8%E6%8A%80%E6%9C%AF%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%A4%96%E5%9B%BD%E8%AF%AD%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%BD%93%E8%82%B2%E5%AD%A6%E9%99%A2%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%95%86%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%8C%BB%E7%A7%91%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8D%97%E5%BC%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B8%88%E8%8C%83%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%90%86%E5%B7%A5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E4%BA%AC%E7%A7%91%E6%8A%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E8%B4%A2%E7%BB%8F%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B8%82%E8%81%8C%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E6%BB%A8%E6%B5%B7%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B7%A5%E7%A8%8B%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E9%9D%92%E5%B9%B4%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E6%B8%A4%E6%B5%B7%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%94%B5%E5%AD%90%E4%BF%A1%E6%81%AF%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E6%9C%BA%E7%94%B5%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%8E%B0%E4%BB%A3%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%85%AC%E5%AE%89%E8%AD%A6%E5%AE%98%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E8%BD%BB%E5%B7%A5%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%95%86%E5%8A%A1%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%9B%BD%E5%9C%9F%E8%B5%84%E6%BA%90%E5%92%8C%E6%88%BF%E5%B1%8B%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%8C%BB%E5%AD%A6%E9%AB%98%E7%AD%89%E4%B8%93%E7%A7%91%E5%AD%A6%E6%A0%A1%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%BC%80%E5%8F%91%E5%8C%BA%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E8%89%BA%E6%9C%AF%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%BA%A4%E9%80%9A%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%86%B6%E9%87%91%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%9F%B3%E6%B2%B9%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%9F%8E%E5%B8%82%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E9%93%81%E9%81%93%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B7%A5%E8%89%BA%E7%BE%8E%E6%9C%AF%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%9F%8E%E5%B8%82%E5%BB%BA%E8%AE%BE%E7%AE%A1%E7%90%86%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E7%94%9F%E7%89%A9%E5%B7%A5%E7%A8%8B%E8%81%8C%E4%B8%9A%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E6%B5%B7%E8%BF%90%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E5%B9%BF%E6%92%AD%E5%BD%B1%E8%A7%86%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E4%BD%93%E8%82%B2%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%A4%A9%E6%B4%A5%E6%BB%A8%E6%B5%B7%E6%B1%BD%E8%BD%A6%E5%B7%A5%E7%A8%8B%E8%81%8C%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%B7%A5%E7%A8%8B%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%9C%B0%E8%B4%A8%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%B7%A5%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8D%8E%E5%8C%97%E7%90%86%E5%B7%A5%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E7%A7%91%E6%8A%80%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%BB%BA%E7%AD%91%E5%B7%A5%E7%A8%8B%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E6%B0%B4%E5%88%A9%E7%94%B5%E5%8A%9B%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%86%9C%E4%B8%9A%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%8C%BB%E7%A7%91%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%8C%97%E6%96%B9%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%89%BF%E5%BE%B7%E5%8C%BB%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%B8%88%E8%8C%83%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%BF%9D%E5%AE%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E6%B0%91%E6%97%8F%E5%B8%88%E8%8C%83%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%94%90%E5%B1%B1%E5%B8%88%E8%8C%83%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%BB%8A%E5%9D%8A%E5%B8%88%E8%8C%83%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E8%A1%A1%E6%B0%B4%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E7%9F%B3%E5%AE%B6%E5%BA%84%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E9%82%AF%E9%83%B8%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E9%82%A2%E5%8F%B0%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%A7%E5%B7%9E%E5%B8%88%E8%8C%83%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E7%9F%B3%E5%AE%B6%E5%BA%84%E9%93%81%E9%81%93%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E7%87%95%E5%B1%B1%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E7%A7%91%E6%8A%80%E5%B8%88%E8%8C%83%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%94%90%E5%B1%B1%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8D%8E%E5%8C%97%E7%A7%91%E6%8A%80%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%9B%BD%E4%BA%BA%E6%B0%91%E6%AD%A6%E8%A3%85%E8%AD%A6%E5%AF%9F%E9%83%A8%E9%98%9F%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E4%BD%93%E8%82%B2%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E9%87%91%E8%9E%8D%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E5%8C%97%E5%8D%8E%E8%88%AA%E5%A4%A9%E5%B7%A5%E4%B8%9A%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E9%98%B2%E7%81%BE%E7%A7%91%E6%8A%80%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E7%BB%8F%E8%B4%B8%E5%A4%A7%E5%AD%A6%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E4%B8%AD%E5%A4%AE%E5%8F%B8%E6%B3%95%E8%AD%A6%E5%AE%98%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E4%BC%A0%E5%AA%92%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
http://www.youdao.com/example/mdia/video/%E6%B2%B3%E5%8C%97%E5%B7%A5%E7%A8%8B%E6%8A%80%E6%9C%AF%E5%AD%A6%E9%99%A2%E6%AF%95%E4%B8%9A%E8%AF%81%E6%A0%B7%E6%9C%AC%E5%8D%81%28V%291134136333%E3%80%91
现在总结一下这个古典加密算法的特点,大概是两个为一组处理+已定义的密钥表(即不是通过输入生成的)5*5+处理时用到索引。
很久很久以前想写某对cp的AU同人时想把ctf元素混进去,就看了很多简单又奇奇怪怪的编码/古典密码(现代密码太学术了XD),没想到现在有用武之地了(手动狗头。
安利一个编码/古典密码的集合:CTF中那些脑洞大开的编码和加密 - jack_Meng - 博客园
然后翻到了一个符合这个特点的密码,Playfair Cipher:
不同的是密码表是直接给出的,不过加密流程再对回ida里的反编译感觉挺像的,于是果断试试。
按照Playfair Cipher的加解密流程写出脚本:
def getIndex(c): for i in range(len(key)): if key[i].find(c)!=-1: return i,key[i].find(c) letter_list="ABCDEFGHJKLMNOPQRSTUVWXYZ" key=["CREIH","TQGNU","AOVXL","DZKYM","PBWFS"] cipher="KIMLXDWRZXTHXTHQTXTXHZWC" text="" for i in range(0,len(cipher),2): j=i+1 x1,y1=getIndex(cipher[i]) x2,y2=getIndex(cipher[j]) if x1==x2: text+=key[x1][(y1+1)%5]+key[x2][(y2+1)%5] elif y1==y2: text+=key[(x1+1)%5][y1]+key[(x2+1)%5][y2] else: text+=key[x1][y2]+key[x2][y1] i+=2 print(text)
走一遍脚本解密可以得到:
YES MAYBE YOU CAN RUN AN ARM PE
No, I can't
看起来能读的通,成功get flag。
flag{YESMAYBEYOUCANRUNANARMPE}
先去肝ddl回来再补,反正就是个查md5的题(