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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CWlmIGsuZGVjcnlwdChkKSAhPSB1bmhleCgiMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwMDAwMTAyMDMwNDA1MDYwNzA4RkY4RkRDQjA0MDgwIik6
CQlwcmludCAiVGVzdCA2IEVycm9yOiBVbmVuY3lwdGVkIGRhdGEgYmxvY2sgZG9lcyBub3QgbWF0Y2ggc3RhcnQgZGF0YSI=
ZGVmIF9fZmlsZXRlc3RfXygpOg==
CWZyb20gdGltZSBpbXBvcnQgdGltZQ==
CWYgPSBvcGVuKCJweURlcy5weSIsICJyYisiKQ==
CWQgPSBmLnJlYWQoKQ==
CWYuY2xvc2UoKQ==
CXQgPSB0aW1lKCk=
CWsgPSBkZXMoIk15REVTS2V5Iik=
CWQgPSBrLmVuY3J5cHQoZCwgIiAiKQ==
CWYgPSBvcGVuKCJweURlcy5weS5lbmMiLCAid2IrIik=
CWYud3JpdGUoZCk=
CWYuY2xvc2UoKQ==
CWQgPSBrLmRlY3J5cHQoZCwgIiAiKQ==
CWYgPSBvcGVuKCJweURlcy5weS5kZWMiLCAid2IrIik=
CWYud3JpdGUoZCk=
CWYuY2xvc2UoKQ==
CXByaW50ICJERVMgZmlsZSB0ZXN0IHRpbWU6ICVmIiAlICh0aW1lKCkgLSB0KQ==
ZGVmIF9fcHJvZmlsZV9fKCk6
CWltcG9ydCBwcm9maWxl
CXByb2ZpbGUucnVuKCdfX2Z1bGx0ZXN0X18oKScp
CSNwcm9maWxlLnJ1bignX19maWxldGVzdF9fKCknKQ==
aWYgX19uYW1lX18gPT0gJ19fbWFpbl9fJzo=
CV9fdGVzdF9fKCk=
CSNfX2Z1bGx0ZXN0X18oKQ==
CSNfX2ZpbGV0ZXN0X18oKQ==
CSNfX3Byb2ZpbGVfXygp

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：