TCP - La roue romaine

Rédaction d'un script python

import socket
import re
import codecs

def netcat(HOST,PORT):

    # Create a socket object
    s = socket.socket()        

    # connect to the server on local computer
    s.connect((HOST, PORT))

    # receive data from the server and decoding to get the string.
    res = s.recv(1024).decode()

    print(res)
    # read number
    regex = "\'(.*)\'"

    # Search regex
    search = re.search(regex, res)

    # # caclul square
    res = codecs.decode(search.group(1),'rot_13')
    print(f'The res : {res}')

    # send result
    s.sendall((str(res)+"\n").encode())

    return s.recv(1024).decode()


def main():
    print(netcat("challenge01.root-me.org",52022))

if __name__ == "__main__":
    main()

Flag :

RM{TCP_R0man_Wh33l!!}