code as follows:
import base64
def decode(ciphertext):
plaintext = ''
ciphertext = base64.b64decode(ciphertext)
for i in ciphertext:
s = ord(i)-16 ######################
s = s^32
plaintext += chr(s)
return plaintext
cipher = 'XlNkVmtUI1MgXWBZXCFeKY+AaXNt'
flag = decode(cipher)
print(flag)
In python3, running
with a hash sign will fail and python2 won’t, because in python3 the ord() accepts a string of length 1, whereas in python3 the I is already an integer, and you can just use i-16 to do the operation
Python3 ord() expected string of length 1, but int found
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