cryptohack.org/challenges

enc.py

# py2
import base64, codecs, json, socket

conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
conn.connect(('socket.cryptohack.org', 13377))

for i in range(101):
    data = json.loads(conn.recv(1024))
    print i, data, 

    if 'flag' in data:
        print '***', data['flag'], '***'
        break

    enc, word = data['type'], data['encoded']
    if enc == "base64":
        decoded = base64.b64decode(word)
    elif enc == "hex":
        decoded = word.decode('hex')
    elif enc == "rot13":
        decoded = codecs.decode(word, 'rot_13')
    elif enc == "bigint":
        decoded = word[2:].decode('hex')
    elif enc == "utf-8":
        decoded = ''.join(chr(b) for b in word)

    print decoded
    conn.send(json.dumps({'decoded': decoded}) + '\n')

conn.close()