Crypto transfer server

from crypto import *
from socket import *
message = ''
seed = int(input('Seed: '))
a = Crypto('key1', message, seed)
s = socket(AF_INET,SOCK_STREAM)
s.bind(('', 20))
s.listen(5)
c,b = s.accept()
print(b)
key = a.key+'\n'
c.send(b'CRYPT_KEY\n '+key.encode()+b'\n ')
message = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur at vestibulum ante, sed lobortis nisi. Etiam est lacus, euismod at lorem eu, vulputate vehicula nunc.'
message = message.split(' ')
ack = False
n = 0
for word in message:
        a.update(word)
        c.send(a.In().encode())
        n += 1
        print(n)
        resp = b''
        while resp is not b'ACK\n':
                print('Waiting for client response...')
                resp = c.recv(4096)
                continue

c.send(b'FIN\n')
c.close()
s.close()