A simple MicroPython micro:bit MicroCipher where you can create encrypted messages and then decrypt them when you share the cipher and encrypted message.
PLUG IN USB CABLE TO COMPUTER AND DEVICE
# MIT License
#
# Designer: Kevin Thomas
# Developer: Kevin Thomas
#
# Copyright (c) 2021 My Techno Talent
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
class MicroCipher:
"""
Class to handle the MicroCipher engine
"""
def __init__(self, fast_wheel, medium_wheel, slow_wheel):
"""
Params:
fast_wheel: int
medium_wheel: int
slow_wheel: int
"""
self.alphabet = ['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']
# computers are zero-indexed, we need to subtract 1, if user selects 1 it becomes 0
self.fast_wheel = fast_wheel - 1
self.medium_wheel = medium_wheel - 1
self.slow_wheel = slow_wheel - 1
wheels = [self.fast_wheel, self.medium_wheel, self.slow_wheel]
for wheel in wheels:
wheel = wheel % 26
self.fast_wheel = wheels[0]
self.medium_wheel = wheels[1]
self.slow_wheel = wheels[2]
self.reverse_wheel = [letter for letter in reversed(self.alphabet)]
def permutate(self, wheel):
"""
Method to re-order the alphabet depending on the wheels settings
Params:
wheel: int
"""
new_alphabet = ''.join(self.alphabet)
new_alphabet = list(new_alphabet)
for iter in range(wheel):
new_alphabet.insert(0, new_alphabet[-1])
new_alphabet.pop(-1)
return new_alphabet
def inverse_permutation(self, wheel):
"""
Method to inverse re-order the alphabet depending on the wheels settings
Params:
wheel: int
"""
new_alphabet = ''.join(self.alphabet)
new_alphabet = list(new_alphabet)
for iter in range(wheel):
new_alphabet.append(new_alphabet[0])
new_alphabet.pop(0)
return new_alphabet
def cipher(self, text):
"""
Method to encrypt/decrypt text
Params:
text: str
"""
cipher_text = []
text.split()
# cipher each letter
for letter in text:
# handle empty space to ignore wheel algorithm
if letter == ' ':
cipher_text.append(' ')
else:
# letter is ciphered by fast wheel
temp_letter = self.permutate(self.fast_wheel)[self.alphabet.index(letter)]
# letter is ciphered by medium wheel
temp_letter = self.permutate(self.medium_wheel)[self.alphabet.index(temp_letter)]
# letter is ciphered by slow wheel
temp_letter = self.permutate(self.slow_wheel)[self.alphabet.index(temp_letter)]
# reverse_wheel is returning the inverse of that letter
temp_letter = self.reverse_wheel[self.alphabet.index(temp_letter)]
# letter is ciphered by slow wheel, inverse algorithm
temp_letter = self.inverse_permutation(self.slow_wheel)[self.alphabet.index(temp_letter)]
# letter is ciphered by medium wheel, inverse algorithm
temp_letter = self.inverse_permutation(self.medium_wheel)[self.alphabet.index(temp_letter)]
# letter is ciphered by fast wheel, inverse algorithm
temp_letter = self.inverse_permutation(self.fast_wheel)[self.alphabet.index(temp_letter)]
# append temp letter to cipher text
cipher_text.append(temp_letter)
# wheel rotation algorithm
self.fast_wheel += 1
if self.fast_wheel % len(self.alphabet) == 0:
self.medium_wheel += 1
self.fast_wheel = 0
if self.medium_wheel % len(self.alphabet) == 0 and self.fast_wheel % len(self.alphabet) != 0 and self.medium_wheel >= len(
self.alphabet) - 1:
self.slow_wheel += 1
self.medium_wheel = 1
upper_cipher_text = ''
for letter in cipher_text:
upper_cipher_text += letter
return ''.join(upper_cipher_text.upper())
while True:
try:
fast_wheel = int(input('FAST WHEEL: '))
if fast_wheel < 1 or fast_wheel > 26:
print('Please enter a value from 1 to 26...')
break
medium_wheel = int(input('MEDIUM WHEEL: '))
if medium_wheel < 1 or medium_wheel > 26:
print('Please enter a value from 1 to 26...')
break
slow_wheel = int(input('SLOW WHEEL: '))
if slow_wheel < 1 or slow_wheel > 26:
print('Please enter a value from 1 to 26...')
break
micro_cipher = MicroCipher(fast_wheel, medium_wheel, slow_wheel)
cipher = input('CIPHER: ')
if not cipher.isupper():
print('Please enter only capital letters...')
break
print('CIPHER: ', end='')
print(micro_cipher.cipher(cipher))
except ValueError:
print('Please enter a value from 1 to 26...')
breakFAST WHEEL: 22
MEDIUM WHEEL: 5
SLOW WHEEL: 16
CIPHER: HI THERE
CIPHER: UV OCJYN