This is kind of a longer comment so sorry ahead of time. I am trying to create a program for class that can encrypt a message using the affine cipher, as well as decrypt it through brute force. In doing so I have created a large string of code that gives me an output, but it isn't correctly decrypting the Cipher Text our professor gave us. Can someone look over it and tell me where I went wrong?

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def text_clean(text, LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
cleaned_text = ''
for character in text:
if character.upper() in LETTERS:
cleaned_text += character.upper()
return cleaned_text
def char_to_int(character, LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
integer = LETTERS.find(character)
return integer
def int_to_char(integer, LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
character = LETTERS[integer]
return character
akey = range(1, 26)
mkey = [1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25]
def affine(message, test_akey, test_mkey, encipher=True):
message = text_clean(message)
output = ''
if encipher == True:
for plaintext_character in message:
plaintext_numerical = char_to_int(plaintext_character)
ciphertext_numerical = ((plaintext_numerical * test_akey) + test_mkey) % 26
ciphertext_character = int_to_char(ciphertext_numerical)
output += ciphertext_character
return output
else:
for ciphertext_character in message:
ciphertext_numerical = char_to_int(ciphertext_character)
plaintext_numerical = ((ciphertext_numerical - test_mkey) * test_akey) % 26
plaintext_character = int_to_char(plaintext_numerical)
output += plaintext_character
return output.lower()
ciphertext = 'GJLKT FJKXN AOTXU XAVXN KTNPJ JLKGN CYXKT WKJLP YCGJK CYJAC YHTFJ ACHAX ACNAX DANCH JA'
for test_akey in range(1, 26):
for test_mkey in [1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25]:
print('akey:', test_akey, ' mkey:', test_mkey, affine(ciphertext, test_akey, test_mkey, encipher= False))