A Secure Messenger Application that uses python Sockets and AES encryption

secure_socket_messenger.py

#!/usr/bin/env python

#python msg.py server port keyfile
#python msg.py client server:port keyfile
#the key must be 32 chars long
import sys
import socket
from Crypto.Cipher import AES
from multiprocessing import Process

obj = AES.new(open(sys.argv[3],'r').read().replace('\n',''), AES.MODE_CFB, 'This is an IV456') #replace the IV

def server():
    port=int(sys.argv[2])
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.bind(('',port))
    server.listen(2)
    print 'Massgeing server Running on 0.0.0.0:',port
    while True:
         conn,addr=server.accept()
         client('localhost',port,conn)
         
def onmsg(conn):
    while True:
        data=conn.recv(2000)
        if len(data)==0:print '\rSomeone closed the connection.';break
        print '\r##> \033[94m',obj.decrypt(data),'\033[0m\n'

def client(host,port,conn):
    print '\033[95m Connected, you are on secure\033[0m'
    Process(target=onmsg,args=(conn,)).start()
    while True:
        input=raw_input('\033[92m > ')
        conn.send(obj.encrypt(input))
      
if __name__=='__main__':
   if sys.argv[1]=='server':
       server()
   else:
       conn=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
       conn.connect((sys.argv[2].split(':')[0],int(sys.argv[2].split(':')[1])))
       client(sys.argv[2].split(':')[0],sys.argv[2].split(':')[1],conn)