0x00 前言

CTF 加解密合集：CTF 加解密合集

0x01 题目

网络有记忆，我也有，所以，我想她了。

提示： 1.题目既提示 2.flag包括小写字母，单词，下划线。

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0x02 Write Up

拿到这道题，虽然知道是base64，但是base64没有结果，所以只能去通过特征来进行判断。

通过对比flag字符，发现内容是Y,^'

那么我们可以看一下flag是怎么变换的，可以通过爆破来进行猜解：

for i in range(300):
    if ord("Y")^i==ord("f"):
        print(chr(i))
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for i in range(300):
    if ord(",")^i==ord("l"):
        print(chr(i))
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可以得到两种变换方式，一个是变换为@一个是变换为?，所以根据提示我们可以进行遍历，通过脚本获取可用字符串即可：

最终得到flag：

flag{the_networknhasnits_memory_i_miss_fafa}
1

以上