密码学 n次base64（分值200）

点此进入南京邮电大学网络攻防训练平台

解题过程

题目已经说得很清楚啦，n次base64，Python解

>>> import base64
>>> a = """Vm0wd2QyUXlVWGxWV0d4V1YwZDRWMVl3WkRSWFJteFZVMjA1VjAxV2JETlhhMk0xVmpKS1NHVkVRbUZX
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VmpGT2RWVnNXbWhsYlhob1ZtMXdUMkl5UmtkalJtUllZbGhTV0ZSV2FFTlNiRnBZWlVoa1YwMUVSa1pW
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VkZacVNrZFNiRkp6Vlcxc1UwMHhSalpXYWtvd1ZURlZlRmR1U2s1WFJYQnhWVzB4YjFZeFVsaE9Wemxz
WWtad2VGVnRNVWRVTWtwR1YyeHdXbFpXY0hKV1ZFWkxWMVpHY21KR1pHbFhSVXBKVm10U1MxVXhXWGhX
YmxaV1lsaENWRmxyVm5kV1ZscDBaVWM1VWsxWFVucFdNV2h2VjBkS1JrNVdVbFZXTTJoSVZHdGFjMk5z
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VDJGV1NuUlBWRTVYVFc1b1dGbHFTa1psUm1SWldrVTFWMVpzY0ZWWFZsSkhaREZrUjJKSVRtaFNlbXhQ
VkZaYWQyVkdWblJsU0dScFVqQndWMVl5ZEhkV01ERnhVbXRvVjFaRldreFdNVnBIWTIxS1IxcEdaRTVO
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Vm1NeFlqRlplRmRxV2xKWFIyaFhWbXRXWVdWc1duRlNiWFJyVm14S01GVnRlRTloUjFaelYyeGtWMkpI
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TlZOV2JVcElaVWRvVm1KSFVsUlZNRnBoWTFaT2NscEZPV2xTV0VJMlZtdGtORmxXVlhsVGExcFlWMGhD
V0Zac1duZFNNVkY0VjJ0T1ZtSkZTbFpVVlZGM1VGRTlQUT09"""
>>> b = base64.b64decode(a)
>>> b
b'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'
>>> c = base64.b64decode(b)
>>> c
b'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'
>>> d = base64.b64decode(c)
>>> d
b'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'
>>> e = base64.b64decode(d)
>>> e
b'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'
>>> f = base64.b64decode(e)
>>> f
b'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'
>>> g = base64.b64decode(f)
>>> g
b'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'
>>> h = base64.b64decode(g)
>>> h
b'Vm0weGQxTnRVWGxXYTFwUFZsZG9WRmxVU2xOalZsWnlWMjVrYWxac1ZqTldNakZIVjJ4YWMxTnNXbFppV0ZGM1dWUkdTMlJXUm5OWGJHUlRUVEZLVVZkV1pIcGxSbVJYVW01T2FWSnNjSEJXYTFwYVpXeFplRmR0UmxwV01EVlpWV3hvZDJGR1NuVlJiazVhVmtVMVJGWXhXbHBsVlRGSllVWldUbFpVVmxwV1ZFb3dWakZXZEZOc2FHaFNiRXBvVm01d1JtVnNjRlpYYkhCclRWWmFlVlF4V21GVWJVcEdZMFJhVjAxdVFsQlpla1poWkVaT2MySkhhRk5OUm5CWFZtMXdUMUV5Vm5OaE0yeHNVak5TY1ZSV1pGTldiRnAwVFZjNVYwMXJjRnBaVldSSFZqSkZlVlJxVWxWaE1YQlRXbFphUzJSV1VuTlZiR1JUWWtaVk1RPT0='
>>> i = base64.b64decode(h)
>>> i
b'Vm0xd1NtUXlWa1pPVldoVFlUSlNjVlZyV25kalZsVjNWMjFHV2xac1NsWlZiWFF3WVRGS2RWRnNXbGRTTTFKUVdWZHplRmRXUm5OaVJscHBWa1paZWxZeFdtRlpWMDVZVWxod2FGSnVRbk5aVkU1RFYxWlplVTFJYUZWTlZUVlpWVEowVjFWdFNsaGhSbEpoVm5wRmVscFZXbHBrTVZaeVQxWmFUbUpGY0RaV01uQlBZekZhZEZOc2JHaFNNRnBXVm1wT1EyVnNhM2xsUjNScVRWZFNWbFp0TVc5V01rcFpZVWRHVjJFeVRqUlVhMXBTWlZaS2RWUnNVbGRTYkZVMQ=='
>>> j = base64.b64decode(i)
>>> j
b'Vm1wSmQyVkZOVWhTYTJScVVrWndjVlV3V21GWlZsSlZVbXQwYTFKdVFsWldSM1JQWVdzeFdWRnNiRlppVkZZelYxWmFZV05YUlhwaFJuQnNZVE5DV1ZZeU1IaFVNVTVZVTJ0V1VtSlhhRlJhVnpFelpVWlpkMVZyT1ZaTmJFcDZWMnBPYzFadFNsbGhSMFpWVmpOQ2Vsa3llR3RqTVdSVlZtMW9WMkpZYUdGV2EyTjRUa1pSZVZKdVRsUldSbFU1'
>>> k = base64.b64decode(j)
>>> k
b'VmpJd2VFNUhSa2RqUkZwcVUwWmFZVlJVUmt0a1JuQlZWR3RPYWsxWVFsbFZiVFYzV1ZaYWNXRXphRnBsYTNCWVYyMHhUMU5YU2tWUmJXaFRaVzEzZUZZd1VrOVZNbEp6V2pOc1ZtSllhR0ZVVjNCelkyeGtjMWRVVm1oV2JYaGFWa2N4TkZReVJuTlRWRlU5'
>>> l = base64.b64decode(k)
>>> l
b'VjIweE5HRkdjRFpqU0ZaYVRURktkRnBVVGtOak1YQllVbTV3WVZacWEzaFpla3BYV20xT1NXSkVRbWhTZW13eFYwUk9VMlJzWjNsVmJYaGFUV3BzY2xkc1dUVmhWbXhaVkcxNFQyRnNTVFU9'
>>> m = base64.b64decode(l)
>>> m
b'V20xNGFGcDZjSFZaTTFKdFpUTkNjMXBYUm5wYVZqa3hZekpXWm1OSWJEQmhSemwxV0ROU2RsZ3lVbXhaTWpscldsWTVhVmxZVG14T2FsSTU='
>>> n = base64.b64decode(m)
>>> n
b'Wm14aFp6cHVZM1JtZTNCc1pXRnpaVjkxYzJWZmNIbDBhRzl1WDNSdlgyUmxZMjlrWlY5aVlYTmxOalI5'
>>> o = base64.b64decode(n)
>>> o
b'ZmxhZzpuY3Rme3BsZWFzZV91c2VfcHl0aG9uX3RvX2RlY29kZV9iYXNlNjR9'
>>> p = base64.b64decode(o)
>>> p
b'flag:nctf{please_use_python_to_decode_base64}'
>>>