ย Here in 2016 we have tons and tons of chat application with various features. They have millions of users and giant servers at very high speed but still why hackers and geeks are running behind encrypted communication like torchat? because privacy. Even though you are using an encrypted and secured application, keep in mind still they work on a third party server you cannot trust them blindly. They can be broken any time. If you are really concerned about privacy, here i have developed a simple application NEURON in python.

Neuron server can be setup on your linux machine and have full controll over it. Neuron python sockets to send message with AES encryption. It has two scripts basically one as server and other as client. Set up server on any machine so that your firends with the script neuron.py can connect to your server remotely with the correct password. No one can invade your privacy, if you find any malicious activity you can simply shut down the server. You can see the connections on the server console and even live chat if you changed the view mode. This is safe application because messages are encrypted in AES algorithm which cannot be cracked without the right key. If an eavesdropper tries to sneak in with a wrong password and if we send a message his script decrypt it with a different key i.e. even if he got the messages in this format he cannot decrypt to raw strings.

This server don’t have any special hardware requirements this can be run on any linux machine and can be user on both LAN and WAN network. Neuron is available on github, follow the steps for complete tutorial. check out the video too so that it will give you an idea.NOTE: forward the port on router for remote connections over internet.

Demo video


Download neuron

clone to github
# git clone https://github.com/susmithHCK/neuron.git


Setup server

Now open the folder so that you can find two main python script and a config file. Config file is for server script, you can tweak it. Open the file with any text editor change the HOST to your internal IP if you are using it on lan network. Change HOST to your public ip if you are using it on WAN network. PORT can be any unused port. Option PASSWORD can be any desired password. change view mode to 1 if you want live feed of chat on the server console. Save and close the file and right click open terminal on that directory.

# python server.py



neuron.py usage

Once the server is setup only thing you need is neuron.py . Anyone with your host details and correct password can connect to your server and create a group chat. Open the terminal in the directory and use the command below.
# python neuron.py “host_ip” “port” “password” “nick_name”

all your friends can connect from the internet with this simple piece of script.

Any doubts or questions? post it on the comment section below. If you like this blog give me a like on facebook and add me on google plus. Subscribe my youtube channel for video tutorials.


Susmith Krishnan

Iโ€™m a computer enthusiast basically and i love to write blogs on tech issues and cyber security. I started penetration testing at the age of 16 and i would like to explore security vulnerabilities and latest tech news and wanna share with you


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    Im trying to fix the bugs. Thanks for reporting. if still the problem persist pls let me know.

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    This is the free version of the theme “colormag”. I have tweaked it a little bit with some css thats all.

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TheBlaCkCoDeR · September 10, 2016 at 6:20 am

But the host ip of clients are visible and can be monitored… if you can add a network cryptography module…

    susmith HCK · September 10, 2016 at 7:00 pm

    U mean hiding client ip ? IP is the basic protocol, we cannot simply encrypt and communicate. However we can use tor . That would be better idea. I will think about it.. ๐Ÿ˜€ if u are coder u can modify the code and commit on github .

Arch!m3de · November 16, 2016 at 5:19 am

Hi, I have a little problem. I configure the neuron.conf to use neuron over the internet. So, i put my public ip. But, when i launch python server.py i get the error:
socket.error: [Errno 99] Cannot assign requested address

Can you explain, if it’s possible, how to fix it ? ๐Ÿ™‚


    susmith HCK · November 16, 2016 at 5:30 pm

    you cannot assign public ip in the server, but you can use internal ip and then forward the port in router. Just enter the external ip in the client. you can connect remotely.

CyberEnginner · April 15, 2017 at 4:16 am

Hello there sir! great article as always ๐Ÿ™‚
But i have a question if you don’t mind ! i want to know how to host this kind of project in a external server so it could stay always online.

I’ve read the previews comment and i understood you answer, but if i host the server on one of my devices that device must be always turned on in order to keep the server always online !!! and i’m afraid that this is impossible because i can’t keep my laptop 24/7 on.

So i’m looking for something that like VPS or Python Server like PythonAnyWhere.com or any host that can run the nueron server and be online 24/7 just like websites do.

I really hope that you respond sir as soon as possible because i’m really exited about it, besides your respond will open a new door of future opportunities in the hosting field…and thank you in advance ๐Ÿ™‚

    susmith HCK · April 17, 2017 at 7:14 pm

    Buy some cheap server online or setup a raspberry pi and configure your custom DDNS.

john · August 17, 2017 at 6:18 pm

hello sir..it was a great program..
but if you make a tutorial for explaining how the code work, that will be fantastic

sahiltikoo · October 2, 2017 at 6:46 am

hey buddy i am having some problem with the aes encrypted chat i developed could you please look at it , https://github.com/viperbluff/EncRyPto_Chat , basically when the message is broadcasted that any user has joined the chatroom an error pops up that input string must be multiple of 16 . I am from india and nobody know anything about python scripting in my college , please help!!

B4D51573M · January 26, 2018 at 7:55 am

Traceback (most recent call last):
File “server.py”, line 126, in
File “server.py”, line 69, in chat_server
server_socket.bind((HOST, PORT))
File “/usr/lib/python2.7/socket.py”, line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 99] Cannot assign requested address
How I fix this?

chris · February 9, 2018 at 9:45 am

Hey lads! i followed this great tutorial but i ran into small problems,the coding didn’t work on my windows op i changed couple things to make it run but when i connected to my chat i couldn’t type, non of my keys on keyboard worked could you guys help me out please>? ๐Ÿ™‚

# neuron_client

import base64
import sys, socket, select
from Crypto.Cipher import AES
import os
import hashlib
import signal

print “””
___ ___ __ _________ ___
/ _ \/ -_) // / __/ _ \/ _ \
/_//_/\__/\_,_/_/ \___/_//_/
messenger v 1.2 | susmithHCK


def sigint_handler(signum, frame):
print ‘\n user interrupt ! shutting down’
print “[info] shutting down NEURON \n\n”

signal.signal(signal.SIGINT, sigint_handler)

def hasher(key):
hash_object = hashlib.sha512(key)
hexd = hash_object.hexdigest()
hash_object = hashlib.md5(hexd)
hex_dig = hash_object.hexdigest()
return hex_dig

def encrypt(secret,data):
pad = lambda s: s + (BLOCK_SIZE – len(s) % BLOCK_SIZE) * PADDING
EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
cipher = AES.new(secret)
encoded = EncodeAES(cipher, data)
return encoded

def decrypt(secret,data):
pad = lambda s: s + (BLOCK_SIZE – len(s) % BLOCK_SIZE) * PADDING
DecodeAES = lambda c, e: c.decrypt(base64.b64decode(e)).rstrip(PADDING)
cipher = AES.new(secret)
decoded = DecodeAES(cipher, data)
return decoded

def chat_client():
if(len(sys.argv) < 5) :
print 'Usage : python neuron.py ‘

host = sys.argv[1]
port = int(sys.argv[2])
key = sys.argv[3]
key = hasher(key)
uname = sys.argv[4]

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

try :
s.connect((host, port))

except :
print “\033[91m”+’Unable to connect’+”\033[0m”

print “Connected to remote host. You can start sending messages”
sys.stdout.write(“\033[34m”+’\n[Me :] ‘+ “\033[0m”); sys.stdout.flush()

while 1:
socket_list = [socket.socket(), s]
read_sockets, write_sockets, error_sockets = select.select(socket_list , [], [])

for sock in read_sockets:
if sock == s:

data = sock.recv(4096)

if not data :
print “\033[91m”+”\nDisconnected from chat server”+”\033[0m”
else :
data = decrypt(key,data)
sys.stdout.write(“\033[34m”+’\n[Me :] ‘+ “\033[0m”); sys.stdout.flush()

else :

msg = socket.socket().readline()
msg = ‘[ ‘+ uname +’: ] ‘+msg
msg = encrypt(key,msg)
sys.stdout.write(“\033[34m”+’\n[Me :] ‘+ “\033[0m”); sys.stdout.flush()

if __name__ == “__main__”:


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