题面是一个文件 里面是用base64加密的字符串 如下所示

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于是解密之后发现和python的一个官方文档相同。这个时候思路就开始跑偏了。。。当时自己想的是比较这两个文件 结果就是越来越偏。

看了别人的writeup之后才搞清楚base64原来有这么多的奥秘在里面。。。
事实上 这个题目利用的是base64加密后的字符串来藏字符。如果base64字符串后面有 时 说明前一个字符的后四位是任意的 既可以写入信息的。如果是 结尾的 前一个字符的后两位是任意的 可以写入信息。
然后还有一个地方在于base64的字符集 要对之前和之后的位置进行异或 再将其拼接起来 就是01字符串 转成字符串得flag。。。
代码

import base64f open( C:\\\\Users\\\\wangchong\\\\Desktop\\\\wangchong\\\\crypto100\\\\timian.txt )index ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 / line f.readline()while line: line2 base64.b64encode(base64.b64decode(line)) line line[0:len(line)-1] if(line[-1] line[-2] ): x line[-3] x1 line2[-3] res str(bin((index.find(x))^(index.find(x1)))).replace( 0b , 00 )[-4:] if(len(res) 3): res 0 res print (str(res)), elif(line[-1] and line[-2]! ): x line[-2] x1 line2[-2] print str(bin((index.find(x))^(index.find(x1)))).replace( 0b , 00 )[-2:], line f.readline()

结果如下

将这些字符拼接到一起转字符串 得到