2021.8.8CTF刷题

一：

手贱
题目描述：

某天A君的网站被日，管理员密码被改，死活登不上，去数据库一看，啥，这密码md5不是和原来一样吗？为啥登不上咧？

d78b6f302l25cdc811adfe8d4e7c9fd34

仔细观察这串字符是33位，发现不属于十六进制的字母l，将其删除，解密md5得到字符串hack

PCTF{hack}

二：

题目：base64

GUYDIMZVGQ2DMN3CGRQTONJXGM3TINLGG42DGMZXGM3TINLGGY4DGNBXGYZTGNLGGY3DGNBWMU3WI===

base64后面最多可能出现两个=号，只有base32可能出现3个等号
使用base32解码，得到504354467b4a7573745f743373745f683476335f66346e7d
猜测是hex编码的字符串，使用hex解码得到FLAG
PCTF{Just_t3st_h4v3_f4n}

首先需要区分base16,base32,base64三种编码方式：

1、base16的编码表字符串是数字0~9和字母A~F；

2、base32的编码表字符串是字母A~Z和数字2~7；

3、base64的编码表字符串是字母A~Z，a~z，数字0~9，“+”，“/”。

4、根据编码原理，只有base32和base64编码方式可能会出现末尾的补位符“=”

三：

题目：

keyboard

题目提示键盘

上面文件的数字正好都是26键得第一行，

位数在1到4位（说明还要用到九键键盘）

所以每字母对应26键上面得数字

而一个字母每次出现的次数是26键的数在9键位置上的第几个字符

例如 o对9 o出现了3次则ooo代表了y

　　 y对6 y出现了3次则yyy代表了o

答案：

youaresosmartthatthisisjustapieceofcake

四:

这是什么

小明是一个软件专业的高材生，但是老师布置的这次的作业似乎不怎么靠谱，因为他们老师以前是学物理的！喜欢乱七八糟命名文件，还喜欢奇奇怪怪的编码。你快帮小明看一下这题，小明准备好了一箱子辣条。注意：得到的 flag 请包上 flag{} 提交

下载好了以后，把后缀改成txt

发现下面的东西：

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JSfuck编码

解码工具

得到答案：

flag{a0448fd730b62c13ca80200c4529daa2}