import random
from string import ascii_lowercase

msg = 'rfkkrnotmjchhddukwsgmcpkfwnsvunmvbndnjuarrnsosihwgyrgg'

def decrypt(msg):
    decrypted = ''
    for i in range(0, len(msg), 3):
        decrypted += chr(ord(msg[i]) + ord(msg[i+1]) - ord(msg[i+2]))
    return decrypted


def encrypt(msg):
    encrypted_message = ''
    for char_ in msg:
                # for each character generate 3 characters randomly where adding unicode values of first 2 chars and subtracting third to get unicode value of letter
        # just pick 2 random characters and deduce the third one using the original character in the message
        temp_chars = ''
        while True:
            temp_chars += random.choice(ascii_lowercase)
            if len(temp_chars) == 2:
                temp_chars+= chr(ord(temp_chars[0]) + ord(temp_chars[1]) - ord(char_))
                break

        encrypted_message += temp_chars

    return encrypted_message



decrypted_message = decrypt(msg)

print(decrypted_message)

encrypted_message = encrypt(decrypted_message)

print(f'another equivalent encrypted message : {encrypted_message}')