CTF论剑场学习——杂项
（https://new.bugku.com/）
头像
（http://123.206.31.85:2018/touxiang.png）
遇到图片题，下意识下载后拖到winhex中分析，搜索文本flag.
签到
如题目所示，点开即得flag。
0和1的故事
刚开始打开压缩包时，逐步解压得一个flag.txt文件，打开后发现是flag is not here。思考可能是遗漏了什么，然后发现压缩包大小不对，隐藏了文件？
后来查阅资料加上大佬提点发现虽然都是压缩文件，但是格式（后缀）不一样。可以用下面一张图解释。
参考文章https://www.linuxidc.com/Linux/2017-02/140397.htm（这篇比较通俗易懂，较为全面）
所以排除了这个可能性，再去看题目时发现“听说空格和零很配”，考虑是否有空格隐写的可能，再次打开flag{}.txt文件，后面有很多空格。
20是空格表示1，那么09就表示0了，最后转换为16进制字符串就是最后的flag了
这个人真的很高
将图片下载后打开，并没有发现什么。
根据题目提示“这个人真的很高”，放入winhex中尝试改变图片的长宽，作为一个小白，这时候就要想改哪里，怎么改，改多少？（白一下参考了以下文章https://blog.csdn.net/CliffordR/article/details/81123232）
先查看图片的具体数据
然后决定把高更改成740，先搜索一个进制在线转换器，输入680，转换成16进制是280，在winhex中搜索0280。
锁定位置后，再搜索740所对应的16进制值，是2e4，将0280改成02E4，另存为XX。再打开更改后的图片
栅栏密码解密，再根据英文字义调整顺序
easypdf
下载之后解压，如果用网页或者文档等形式查看pdf是不能做任何移动的，下载了一个pdf编辑器，利用编辑器打开pdf之后，发现左上角还有一个框
将图片移动开，发现flag。
根据题目提示改成小写就好了。
损坏的图片
CTF中UE、winhex打开文件里面的各类文件头：https://blog.csdn.net/qq_39030256/article/details/83009354
文件解压之后得到两张损坏的图片，先拖到winhex中分析一下
看到最后一行
当它反过来，变成89 50 4E 47时，发现是png图片的文件头，猜测：是正常格式反过来了。
import re
str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str1 = re.sub(r"(?<=\w)(?=(?:\w\w)+$)"," ",str1)
list1 = str1.split()
list1 = list(reversed(list1))
str1 = " ".join(list1)
print(str1)
我是直接用记事本编写后再改后缀，打开命令提示符后输入python再将文件直接拖入即可
看到损坏图片的大小是6.6KB,新建了一个文件，把跑出来的数据粘贴到文件里去
编辑–剪贴板数据–粘贴–ASCII Hex（别选错），将图片另存，打开，得到一个二维码。
感觉有点奇怪，第二张图还没用就得到了flag.
怀疑人生
哈哈哈，ctf真的搞得我天天怀疑人生，下载文件，解压。
第一个是加密的压缩包，第三个是高糊的二维码，第二个暗藏玄机。。。。。
第三个二维码利用网站扫https://online-barcode-reader.inliteresearch.com/
第一个压缩包，看大佬的writeup说跑一遍字典，得出密码是password。。。不是很懂，用foremost也出现了问题，