RCTF crypto100(1)
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 base64
f=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：
