东京大学加密招生海报解密过程

 

这个是去年东京大学情報理工学系研究科的招生海报，我看到人人网和微博都疯狂转载。 
此图一出，宾大和CMU都难与之争锋。高校IT男屌纷纷跪舔，各种遐想和意淫，我们东大的软妹子一副古色古香的打扮，娴静而端庄，这样的的学妹， 你有吗？当大家对着可爱的妹子胡思乱想时，不知你是否想过，前面的那一串二进制01串并非是用脸滚键盘出来的装饰品，而是别有深意呢？一曲肝肠断，天涯何 处觅知音，我们只写给懂的人看。正如本太君常年写的日志，可以读成单纯的温情小故事，也可以读出高端黑，全看读者姿势水平。 
实际上，这此图精髓之处并非作为背景的妹子，而恰恰是前面的这个0101一大串二进制数字，看到棒棒和洞洞你激动了吗？我想很多青年早已猜到里面含有信息——搞计算机的没妹子，而且不是1就是0。啊哈，玩笑过后我们就来看看这个0101到底是什么意思。 
首先用ocr软件将图片上的数字转化为文本，数字串总共26行，除最后一行98个数字外其它每行110个数字，共计2848个数字。神马？你说你是人工抄写的？卧槽，连光学字符识别都不会用，您还是留在清华保研吧。 

00011111100010110000100000000000000000000000000000000000000000000000001000000011011011010101000011001011010011 
10110000100100000000010100001111010101001100011110100001010101101010110101100000001110000000000011010100001101 
10000101000100010011011010001110001000010110001100010011000110101100010011000011010010011010011000001101100010 
11100000011010011010101001010111100001110100010011011001110101100000001011000011110111010010111101110010111000 
11010110000001010010011000101110111111000000000011111111110000111000111101110000111000011110001100010110010011 
01000011001000100110010011110011001001110010111001111101111001111010010011011110111110111001111101111111010111 
11000111111000000001101100001000011110110010000001100001010100101011010010011010110011000010010010000010000010 
10010100100001100011011000110010000110001101010110010001010101111001000101010010101100001100111100010011110111 
10000101001010111110010000000001010000111010010001100010101101100001100110100010010011011110111111010010001000 
01000110000111001011100001001100101110010000101010000101111100011100111101001111101110011011010110100000001011 
10111101011101010110010010110000011011000010101111011010111010000111101101001110010110010110111001000111011011 
11111110000100111110111110011110111100001100110111000001110100001001001001000001010100101100011010000101100011 
00010011010110110000110011100110101001001100101001000111110000010110000000100010011011010101011100111000000100 
11101011110110011001010101011001011010110111011111111010110000111010100100100110001111101011000010011100110110 
10101001111011010101000111110000011110100011110110100001010101110111010101001110010001110101000101000101000001 
01010010110001101011010110001100000111001001010000011000100110000110001000110010111111100101101010011110011101 
10011110011000111100101110000101010101000110101101111010001000111001110100100001111110011111010101000110010101 
00110010001111111011111000000100111001111001110101010001101110011000100100010110010111010011111000101100001011 
11100010100010011000110110111010011001001001111011010010111000001111000011100100100100010011101011010001110010 
01100101001101100001101100110000111111010010101000011010011000000111110100011000100001101010010110100110110110 
01010001010000101001110011010110000101110001111010000101001011100100110100001001000001101000110101111110001010 
01010000100100011000011000110110110111110100000010011110111001100000010011100100100101100010000010111111100101 
10110110111000100000100010100000100001100001001110011101001000101000000110001110011000011101111100101000111101 
01000011010010100100011000001000010001111011110001101010100110001111110100001101110100100001101101100010101101 
11000010111011101011111111011110010000100010100101101101100100110101111000001101110010100000011100110101011000 
01111011110010100000000010110111111110101010100011000010011100000110111110000000010000000000000000  

首先第一个想法肯定是ASCII编码，由于不知道是big-endian还是little-endian就两个都试一次，结果看不出来是什么有意义的字符串。考虑到可能用凯撒密码加密过，去掉非拉丁字母后反解出26个可能的文本，也都没有什么意义。  看来不是ASCII编码。  
考虑到2848长度是8的倍数，也可能是二进制文件，所以也big-endian和little-endian地读出来并写成二进制文件。 
而big-endian的那个输出是一个gz压缩包。实际上，看不出来的话，也可以把文件头的3个字节丢google。如果你直接用Linux中的file命令看岂不是显得咱技术含量太低太傻瓜化？ 

 

改名为bin.gz，解压得到一个叫做bin的文件。内容： 

\CA\FE\BA\BE\00\00\002\00! 
\00\00 \00\00\00 
\00\00 
\00\00\00\00
\00<init>
\00()V
\00Code
\00main
\00([Ljava/lang/String;)V
\00 StackMapTable \00\00 \00 \00\00
\00)w-aurlwtcniewo./-t.kjhltiypioe.o/kvru.fae\00 \00\00\00 \00\00
\00
i
\00java/lang/Object
\00java/lang/System
\00out
\00Ljava/io/PrintStream;
\00java/lang/String
\00charAt
\00(I)C
\00java/io/PrintStream
\00print
\00(C)V\00 \00\00\00\00\00\00\00\00\00\00\00 \00
\00 
\00\00\00\00
\00
\00\00\00*\B7\00
\B1\00\00\00\00\00 \00 \00 \00
\00 
\00\00\00=\00\00\00\00\00!=)\A2\00\B2\00h)p\B6\00\B6\00\84
\A7\FF\E5\B1\00\00\00
\00 \00\00\00  

熟悉java的同学应该一眼就能看出(额也许熟悉java的也不一定能)这是个编译过的class文件（看不懂的也可以用jd-gui反编译）， 改名为bin.class，运行提示Exception in thread "main" java.lang.NoClassDefFoundError: bin (wrong name: i)再改名为i.class，运行得到www.i.u-tokyo.ac.jp/fun/hikari-loveletter  点开能在此帝国大学的官 方网站里找到妹子写真哦~ 
另外还有版权信息的文本解密： 0x11c开始，sjis编码 

 

恭喜！能看到这一步，你已经有不提交任何材料直接给面试的资格了，但是离最终录取还有下面一段路程。 

 

我给你翻译翻译，什么叫惊喜！翻译翻译，什么叫TMD惊喜！这TM才叫惊喜！才叫文艺小清新，把豆瓣爆出翔不知几条街。说时迟那时快二话不说，点 next进去，有一首歌 ヒカリラブレター，就是海报上那个我的学妹唱的，她叫六角ゆめ，顺便帮她宣传一下她的专辑，所有作曲编曲制作演唱发行，都是我东大生弄的，这就是帝国大学 高帅富们和一般码农的区别，技术宅也可以这么专注，浪漫，性感。而这里的白富美，上得了厅堂，下得了厨房，写得了代码，查得出异常，随便去六本木大厦实习 google，鄙视着50层楼上的高盛IT back office，兼职模特可能是IT大神。 

 

在2:58 - 3:01那一段，明显不是日语，而且感觉是机器合成的一样，一定是我们打开的方式不对，我们可以用audacity把这段剪出来分析一下。 

 

精髓中的精髓出现了！  倒放录音 （你听到违和的机器声音会想到反过来听吗）可以听到“聞いてくれてありがとう” （谢谢您的倾听）技术宅哥哥感动吗，心被融化了吧，哭出来了吗，而且跟结尾的"届くといいな"前后呼应。能做到这一步的，恭喜，免试录取了！！我劝三本狗 还是直接给东大的技术含量和文艺小清新程度跪下吧。 



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那么接下来来看看前年的招生海报吧。妹子还是一如既往的可爱。 

 

100011101110010011000010110010001110101011000010111010001100101001000000101001101100011011010000110111101101111 
011011000010000001101111011001100010000001001001011011100110011001101111011100100110110101100001011101000110100 
101101111011011100010000001010011011000110110100101100101011011100110001101100101001000000110000101101110011001 
000010000001010100011001010110001101101000011011100110111101101100011011110110011101111001001011000010000001010 
100011010000110010100100000010101010110111001101001011101100110010101110010011100110110100101110100011110010010 
000001101111011001100010000001010100011011110110101101111001011011111000111011100100110000101100100011101010110 
000101110100011001010010000001010011011000110110100001101111011011110110110000100000011011110110011000100000010 
010010110111001100110011011110111001001101101011000010111010001101001011011110110111000100000010100110110001101 
101001011001010110111001100011011001010010000001100001011011100110010000100000010101000110010101100011011010000 
110111001101111011011000110111101100111011110010010110000100000010101000110100001100101001000000101010101101110 
011010010111011001100101011100100111001101101001011101000111100100100000011011110110011000100000010101000110111 
101101011011110010110111110001110111001001100001011001000111010101100001011101000110010100100000010100110110001 
101101000011011110110111101101100001000000110111101100110001000000100100101101110011001100110111101110010011011 
010110000101110100011010010110111101101110001000000101001101100011011010010110010101101110011000110110010100100 
000011000010110111001100100001000000101010001100101011000110110100001101110011011110110110001101111011001110111 
100100101100001000000101010001101000011001010010000001010101011011100110100101110110011001010111001001110011011 
010010111010001111001001000000110111101100110001000000101010001101111011010110111100101101111100011101110010011 
000010110010001110101011000010111010001100101001000000101001101100011011010000110111101101111011011000010000001 
101111011001100010000001001001011011100110011001101111011100100110110101100001011101000110100101101111011011100 
010000001010011011000110110100101100101011011100110001101100101001000000110000101101110011001000010000001010100 
011001010110001101101000011011100110111101101100011011110110011101111001001011000010000001010100011010000110010 
100100000010101010110111001101001011101100110010101110010011100110110100101110100011110010010000001101111011001 
100010000001010100011011110110100011101110010011000010110010001110101011000010111010001100101001000000101001101 
100011011010000110111101101111011011000010000001101111011001100010000001001001011011100110011001101111011100100 
110110101100001011101000110100101101111011011100010000001010011011000110110100101100101011011100110001101100101 
001000000110000101101110011001000010000001010100011001010110001101101000011011100110111101101100011011110110011 
10111100100101100001000000101010001101000011001010010000001010101011011100110100101110110011001010111001001110011011  

共27行，除最后一行116个数字外每行111个数字，共计3002个数字。  尝试掐掉末尾转成ASCII码和二进制文件都失败了。 试着转化为图像，大致如图。你看了可别以为拿微信一扫加了东大好友就能拿offer。 

 

仔细观察可以发现，  似乎什么东西重复了4遍 ，于是用kmp(蛋疼吧)作check，发现第1-第623个字符重复了3次，而第四次的后面似乎有些噪声。不管它，先把1-623扣出来。 
623不是8的倍数，  但623=7*89，考虑到ASCII码第一位一定是0，所以每7位组成一个字符，尝试打出来。 毫无结果…… 等等，第一位一定是0的话，似乎这串里8的倍数的位置都是0，这样的话……莫非是最后补上一个0，然后这回是看作little-endian？尝试后依旧 无果……再等等，8的倍数的位置都是0的话，也有可能是在第一位补0，然后看作big-endian。这回结果出来了 
Graduate School of Information Science and Technology, The University of Tokyo  
哈哈，可惜不是妹子的联系方式。这个妹子的衣服叫做“十二单“，是一种极其考究的古服，且不说价格足以让你们这些码农卖?肾?，想解开这个妹子的十二单吗，你得把情报解密到这个程度妹子才能看上你。 


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今年的招生海报，万年不变的美人计，和风萌妹子+geek解密，精确营销专业捕获nerd，我觉得这个marketing能斩获戛纳广告节大奖了 有木有？俺们就是这样去北大清华骗工科男屌过来干活的，今年加了个上海交大，这才是真正前三的中国大学。咱知道你最想要什么，来我们学校吧么么哒，这TM 才叫励志广告。据说破译今年密码的青年，可以直接双倍全奖+一封院士级别推荐信，将来圈内国内外任何大学任何教职随你挑，回国也有小千人计划等你。干吧 咧！！！ 
清晰海报地址http://www.i.u-tokyo.ac.jp/edu/entra/poster_ja.shtml当然大部分人第一关就过不了比如不懂shtml无法将原图片另存为，然后只能截屏。 
如果够技术宅，算到最后会得到一串密码，录取地址http://www.i.u-tokyo.ac.jp/fun/010101/index.html 

上文来自：http://www.oschina.net/question/139572_77793?fromerr=WFL0ljfZ