Morse Code Translator in Python

Morse Code Translator is used in Cryptography. It is named by Samuel F. B. Morse. By this technique we convert a message to a series of dots, commas,"-","/".

This technique is very simple. Every alphabet in English signifies a series of ".",",","/","-". We just encrypt the message from message to symbols and decrypt from symbols to English.

The dictionary is given below

'A':'.-', 'B':'-...',
'C':'-.-.', 'D':'-..', 'E':'.',
'F':'..-.', 'G':'--.', 'H':'....',
'I':'..', 'J':'.---', 'K':'-.-',
'L':'.-..', 'M':'--', 'N':'-.',
'O':'---', 'P':'.--.', 'Q':'--.-',
'R':'.-.', 'S':'...', 'T':'-',
'U':'..-', 'V':'...-', 'W':'.--',
'X':'-..-', 'Y':'-.--', 'Z':'--..',
'1':'.----', '2':'..---', '3':'...--',
'4':'....-', '5':'.....', '6':'-....',
'7':'--...', '8':'---..', '9':'----.',
'0':'-----', ', ':'--..--', '.':'.-.-.-',
'?':'..--..', '/':'-..-.', '-':'-....-',
'(':'-.--.', ')':'-.--.-'}

Example

Message is PYTHON-PROGRAM
Output is .--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- --

Algorithm

Encryption

Step1: Given a string, atfirst we extract each letter from the word and match with the Morse Code dictionary, then we consider the code corresponding the letter.
Step2: Next step is to store the code into a variable. And we have to follow that one space should be maintained between every Morse code.
Step3: Two spaces should be maintained in between every word.

Decryption

Step1: First we add a space at the end of the string.
Step2: Now we traverse each letter of the message until space is not encountered.
Step3: When we get space then check with Morse Code Dictionary and store in a variable.
Step4: When get 2 consecutive spaces we will add another space to our variable containing the decoded string.
Step5: When get last space of the message that means this is the last letter of Morse Code Generator.

Example code

# -*- coding: utf-8 -*-
"""
Created on Tue Oct  2 11:21:31 2018
@author: Satyajit
"""
# Dictionary representing the morse code chart
MORSE_CODE_DICT = { 'A':'.-', 'B':'-...',
   'C':'-.-.', 'D':'-..', 'E':'.',
   'F':'..-.', 'G':'--.', 'H':'....',
   'I':'..', 'J':'.---', 'K':'-.-',
   'L':'.-..', 'M':'--', 'N':'-.',
   'O':'---', 'P':'.--.', 'Q':'--.-',
   'R':'.-.', 'S':'...', 'T':'-',
   'U':'..-', 'V':'...-', 'W':'.--',
   'X':'-..-', 'Y':'-.--', 'Z':'--..',
   '1':'.----', '2':'..---', '3':'...--',
   '4':'....-', '5':'.....', '6':'-....',
   '7':'--...', '8':'---..', '9':'----.',
   '0':'-----', ', ':'--..--', '.':'.-.-.-',
   '?':'..--..', '/':'-..-.', '-':'-....-',
   '(':'-.--.', ')':'-.--.-'
}
def encryption(message):
   my_cipher = ''
   for myletter in message:
      if myletter != ' ':
         my_cipher += MORSE_CODE_DICT[myletter] + ' '
      else:
         my_cipher += ' '
      return my_cipher
# This function is used to decrypt
# Morse code to English
def decryption(message):
   message += ' '
   decipher = ''
   mycitext = ''
   for myletter in message:
      # checks for space
      if (myletter != ' '):
         i = 0
         mycitext += myletter
      else:
         i += 1
         if i == 2 :
            decipher += ' '
         else:
            decipher += list(MORSE_CODE_DICT.keys())[list(MORSE_CODE_DICT
            .values()).index(mycitext)]
            mycitext = ''
   return decipher
def main():
   my_message = "PYTHON-PROGRAM"
   output = encryption(my_message.upper())
   print (output)
   my_message = ".--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- -- "
   output = decryption(my_message)
   print (output)
# Executes the main function
if __name__ == '__main__':
   main()

Output

.--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- --
PYTHON-PROGRAM