b64_rolling_xor_decryptor

import base64

encstring = "eWDPeG1uYyzINTojIDHAcmVzID8=" #encrypted string
key = base64.b64decode("AkKsFwAD")

def rolling_xor(data, key):
        encrypted = b''
        for i, c in enumerate(data):
            encrypted += bytes((c ^ key[i % len(key)],))

        return encrypted

data = base64.b64decode(encstring)
decstring = rolling_xor(data, key).decode()
print(decstring) #decrypted string