How to secure messages travelling between a socket client and server in Python 3?

Question

I am trying to secure messages that travel between a Python socket server and client. I have done research and found the following links: Wrapping an existing socket in SSL - Python Python socket client and server http://the.randomengineer.com/2013/10/11/a-practitioners-overview-to-ssl-and-viewing-the-certificate-chain-from-python/

and have viewed the Python documentation: https://docs.python.org/3.5/library/ssl.html

But I still do not understand exactly how to do this. Most tutorials found online are referring to Apache or HTTP servers.

Here is some code that may explain exactly what I am trying to ask:

Client:

import socket, sys
host = 'localhost'
port = 5558
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
    s.connect((host,port))
except socket.error as e:
    print (str(e))
    y = input('Press enter to close')
    sys.exit()
data = 'test'
s.sendall(str.encode(data))

Server:

import socket, time
host = ''
port = 5558
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
s.listen(10)
sock, addr = s.accept()
data = sock.recv(2048)
print(data.decode('utf-8'))

Look at: carlo-hamalainen.net/blog/2013/1/24/…

Daniel
– Daniel

2015-07-04 11:24:58 +00:00
Commented Jul 4, 2015 at 11:24 — Daniel
– Daniel, Commented Jul 4, 2015 at 11:24

Christopher Janzon · Accepted Answer · 2015-07-04 11:34:03Z

3

Try to simply encrypt your message with AES from PyCrypto.

Example:

from Crypto.Cipher import AES
from Crypto import Random
IV = Random.new().read(32)
c = AES.new('abcd1234efgh5678', AES.MODE_CFB, IV)
data = c.encrypt('test')

c.decrypt(data)

The code is not tested.

answered Jul 4, 2015 at 11:34

Christopher Janzon

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2 Comments

user4884072 Over a year ago

Just read your answer - out of curiousity, why did you write 'abcd1234efgh5678' in the fourth line of your code?

Christopher Janzon Over a year ago

The password needs to be 16 bytes.

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