首先使用 file 命令猜文件类型
果然，每个文件都暗藏玄机。一个 PNG，一个 JPG，一个 OGG 音频，一个文本文件。
前三个改扩展名后就可以直接打开了。
sayori.ogg
最初我使用的是 Audacity 打开的，试图量化波形，搞得一头雾水
后来才想起了 Sonic Visualizer 这个工具
直接使用内置的 Layer -> Spectrogram 工具，就能解码出隐藏的内容了。
调整下右边的参数，截图用修图工具稍微处理一下畸变，最终得到一个可扫描的二维码
扫描后得到一个地址：http://projectlibitina.com
进去后是一个看似是某种人体试验的报告书。。。。瞬间感觉汗毛立起来了
音频地址：https://serval.moe/sayori.ogg
monika.png
每个黑块/白块均为 1x1大小，小心截取中央部分导出为BMP格式。
monika.bmp
file 结果显示，导出了 140x140 的 32 位 BMP 位图，140x140 = 196000 bit = 24500 字节
图像最下面一行右半部分是全黑，推测是文件末尾无法对齐所造成的，因此源文件的读取方式应该是从上到下逐行读取。
写一个 Go 程序，把二进 制信息导出为 monika.bin
惯例 cat 一下
好家伙，还是 Base64，继续用之前的 Ruby 脚本转换 Base64
最终拿到了一篇文章:
Can you hear me？
...Who are you？
I can't...I can't see you.
But I know you're there. Yeah...you can definitely hear me.
You've been watching for a while now, right？
I guess I should...introduce myself, or something. Um...my nameis...actually, that's stupid. You obviously already know my name. Sorry.
Anyway...I'm guessing if you were able to put a stop to this, you would havedone it by now.
I mean, I know you're not, like...evil, or anything...because you've alreadyhelped me so much.
I should really thank you for that. For everything you've done. You're reallylike a friend to me. So...thank you. So much.
I think...more than anything else...I really don't want it to all be fornothing.
Everyone else is dead.
Maybe you already know that. I'm sure you do, actually.
But...it doesn't have to be that way, right？
Well...there's a lot of stuff I don't understand. I don't know if it's evenpossible for me to understand it.
But I know that this isn't my only story.
I can see that now. Really clearly.
And I think everyone else has had the same kind of experience. Some kind ofdeja vu.
It's the Third Eye, right？
Anyway...I could be totally wrong about this. But I really think you might beable to do something.
I think you might be able to go back...or however you want to put it...
...To go back and tell them what's going to happen.
If they know ahead of time, then they should be able to avoid it.
They should...if they remember their time with me in the other worlds...theyshould remember what I tell them.
Yeah. I really think this might be possible. But it's up to you.
I'm sorry for always being...you know...
...
Never mind. I know that's wrong.
This is my story. It's time to be a ****ing hero.
Both of us.
2018
以上，搞定 monika.png 这个文件
natuski.jpg
一张猎奇的图片
解密出来了，把这个图片反相再旋转180度，贴到球面上就是一个人物画像
yuri.txt
yuri角色背后的故事：点击前往
扫一扫，访问手机页面
