工业网络中存在异常 尝试通过分析PCAP流量包 分析出流量数据中的异常点 并拿到FLAG。flag形式为 flag{}
找到最长的一条
发现
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python将后面base解码得到的保存png
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UUQogUKMlIURxSFHe/OT7ZBzKgCZDXGVK4IVS56moKIYQYHDKgCVDJxDKEKaLgghBCiOFDBjQBcossYxgj/PXzXlCKiRBCDCsyoIlwQjvlrz50uH04s0/Hnjq3DEAa5MHNQggh8iMD2icH3n2/WLlqd1kE/tY7VxdXTV5a1nw9/6JF5X8paECR96dnvDruxcuFEELkQwZUCCGESEAGVAghhEhABlQIIYRIQAZUCCGESEAGVAghhEhABlQIIYRIQAZUCCGESEAGVAghhEhABlQIIYRIQAZUCCGESEAGVAghhEhABlQIIYRIQAZUCCGESEAGVAghhIimKP4XBcAIzFfvoBoAAAAASUVORK5CYII import base64 with open( img.png , wb )as f: f.write(base64.b64decode(data))
得到
flag{ICS-mms104}
from flag import flag
assert flag.startswith( flag{ )
assert flag.endswith( } )
assert len(flag) 27
def lfsr(R,mask):
output (R 1) 0xffffff
i (R mask) 0xffffff
lastbit 0
while i! 0:
lastbit^ (i 1)
i i 1
output^ lastbit
return (output,lastbit)


