Simple exploration of the Lorentz cipher concept using Python - see also https://wp.me/p4DE9r-1mc

baudot.py

# Baudot
import random
import string

# Taken from https://www.cryptomuseum.com/ref/ita2/index.htm
baudot = { 'a': '0b00011', 
           'b': '0b11001',
           'c': '0b01110',
           'd': '0b01001',
           'e': '0b00001',
           'f': '0b01101',
           'g': '0b11010',
           'h': '0b10100',
           'i': '0b00110',
           'j': '0b01011',
           'k': '0b01111',
           'l': '0b10010',
           'm': '0b11100',
           'n': '0b01100',
           'o': '0b11000',
           'p': '0b10110',
           'q': '0b10111',
           'r': '0b01010',
           's': '0b00101',
           't': '0b10000',
           'u': '0b00111',
           'v': '0b11110',
           'w': '0b10011',
           'x': '0b11101',
           'y': '0b10101',
           'z': '0b10001',
           ' ': '0b00100',
           'N': '0b00000',
           'C': '0b01000',
           'L': '0b00010',
           'F': '0b11011',
           'T' : '0b11111'}

message = 'my secret message'

# Create keystring:
# https://stackoverflow.com/questions/2823316/generate-a-random-letter-in-python

#random_choice_characters = string.ascii_lowercase
#random_choice_characters = 's'
random_choice_characters = list(baudot.keys())

key_string = ''.join(random.choice(random_choice_characters) for x in range(len(message)))


print('\nOriginal message: ')
print(message)

print('\nOriginal Baudot: ')
[print(baudot[i][2:7]) for i in message]

print('\nKey String: ')
print(key_string)

broadcast = []
for i, letter in enumerate(message):
    broadcast.append(int(baudot[letter], 2) ^ int(baudot[key_string[i]], 2))

print('\nBroadcast signal: ')
[print(f"{i:#07b}"[2:7]) for i in broadcast]

# Receive signal
# Do reverse lookup of dictionary:
# https://stackoverflow.com/questions/8023306/get-key-by-value-in-dictionary
# Need to somehow handle zero padding
# https://stackoverflow.com/questions/16926130/convert-to-binary-and-keep-leading-zeros-in-python
# https://stackoverflow.com/questions/1523465/binary-numbers-in-python#1523581

received_message = []
for i in broadcast:
    received_message.append(list(baudot.keys())[list(baudot.values()).index(f"{i:#07b}")])

print('\nMessage Received: ')
print(''.join(received_message))


decrypted_message = []
# Decrypt signal
# Need to XOR with original key_string again
for i, letter in enumerate(received_message):
    decrpyted_code = int(baudot[letter], 2) ^ int(baudot[key_string[i]], 2)
    decrypted_message.append(list(baudot.keys())[list(baudot.values()).index(f"{decrpyted_code:#07b}")])

print('\nMessage Decrypted: ')
print(''.join(decrypted_message))