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安恒杯9月misc1 crc32碰撞

字数统计: 217阅读时长: 1 min
2018/09/23 Share

压缩包打开看crc32

前面三个文本合起来就是压缩包密码

通过crc去还原文本内容

每一个都有很多种可能

通过python整合一下

 

 

list1=[
"05J728",
"0EvF7h",
"2ysXnu",
"3y2iul",
"R9DrOf",
"WQkoQX",
"avuKGt",
"dO875V",
"dSwk4B",
"forum_",
"go3DvF",
"ldpDP2",
"r6wKtc",
"s66zoz",
"yQGfVS"
]
list2=[
"2VSYDo",
"5OTgnD",
"7sQy7Y",
"91ctf_",
"AVfsVk",
"N5K_u8",
"OYyCje",
"PgLPQi",
"aYUJmn",
"c425Xo",
"cePT4s",
"d1zWsP",
"pt05kx",
"rTzw3q"
]
list3=[
"1Atmmb",
"6XsSGI",
"EXFyUM",
"KWYIiC",
"Qm0jH5",
"Spkdxd",
"TilZRO",
"Uub7HB",
"ZfsjnA",
"cN3O_z",
"com_66",
"dW4quQ",
"kXjpRF",
"lAmNxm",
"n0EmLx",
"r24Q5p",
"rcV0Yl",
"tf_ciJ"
]
for i in list1:
    for j in list2:
        for n in list3:
            print(i+j+n)


然后去爆破:

压缩包打开:
convert.txt里面一串二进制:
用jpocketknife转换成ascii:

<img src=”data:image/png;base64,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” />

是个二维码,扫一下就是flag

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