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babycrypto

根据提示联想到xor。 base64解码后，爆破xor即可。 exp.py:

from base64 import b64decode

CIPHERTEXT_FILE = 'ciphertext.txt'

encrypted = None
with open(CIPHERTEXT_FILE, 'r') as f:
  s = f.read()
  encrypted = b64decode(s)

for i in range(256):
  s = ''.join(chr(ord(c) ^ i) for c in encrypted)
  print s

flag:

flag{diffie-hellman-g0ph3rzraOY1Jal4cHaFY9SWRyAQ6aH}

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