Python/ciphers/autokey.py
Victor Rodrigues da Silva 3f8b2af14b
Add autoclave cipher ()
* Add autoclave cipher

* Update autoclave with the given suggestions

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Fixing errors

* Another fixes

* Update and rename autoclave.py to autokey.py

* Rename gaussian_naive_bayes.py to gaussian_naive_bayes.py.broken.txt

* Rename gradient_boosting_regressor.py to gradient_boosting_regressor.py.broken.txt

* Rename random_forest_classifier.py to random_forest_classifier.py.broken.txt

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* Rename equal_loudness_filter.py to equal_loudness_filter.py.broken.txt

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
2022-12-18 23:26:39 +01:00

132 lines
4.1 KiB
Python

"""
https://en.wikipedia.org/wiki/Autokey_cipher
An autokey cipher (also known as the autoclave cipher) is a cipher that
incorporates the message (the plaintext) into the key.
The key is generated from the message in some automated fashion,
sometimes by selecting certain letters from the text or, more commonly,
by adding a short primer key to the front of the message.
"""
def encrypt(plaintext: str, key: str) -> str:
"""
Encrypt a given plaintext (string) and key (string), returning the
encrypted ciphertext.
>>> encrypt("hello world", "coffee")
'jsqqs avvwo'
>>> encrypt("coffee is good as python", "TheAlgorithms")
'vvjfpk wj ohvp su ddylsv'
>>> encrypt("coffee is good as python", 2)
Traceback (most recent call last):
...
TypeError: key must be a string
>>> encrypt("", "TheAlgorithms")
Traceback (most recent call last):
...
ValueError: plaintext is empty
"""
if not isinstance(plaintext, str):
raise TypeError("plaintext must be a string")
if not isinstance(key, str):
raise TypeError("key must be a string")
if not plaintext:
raise ValueError("plaintext is empty")
if not key:
raise ValueError("key is empty")
key += plaintext
plaintext = plaintext.lower()
key = key.lower()
plaintext_iterator = 0
key_iterator = 0
ciphertext = ""
while plaintext_iterator < len(plaintext):
if (
ord(plaintext[plaintext_iterator]) < 97
or ord(plaintext[plaintext_iterator]) > 122
):
ciphertext += plaintext[plaintext_iterator]
plaintext_iterator += 1
elif ord(key[key_iterator]) < 97 or ord(key[key_iterator]) > 122:
key_iterator += 1
else:
ciphertext += chr(
(
(ord(plaintext[plaintext_iterator]) - 97 + ord(key[key_iterator]))
- 97
)
% 26
+ 97
)
key_iterator += 1
plaintext_iterator += 1
return ciphertext
def decrypt(ciphertext: str, key: str) -> str:
"""
Decrypt a given ciphertext (string) and key (string), returning the decrypted
ciphertext.
>>> decrypt("jsqqs avvwo", "coffee")
'hello world'
>>> decrypt("vvjfpk wj ohvp su ddylsv", "TheAlgorithms")
'coffee is good as python'
>>> decrypt("vvjfpk wj ohvp su ddylsv", "")
Traceback (most recent call last):
...
ValueError: key is empty
>>> decrypt(527.26, "TheAlgorithms")
Traceback (most recent call last):
...
TypeError: ciphertext must be a string
"""
if not isinstance(ciphertext, str):
raise TypeError("ciphertext must be a string")
if not isinstance(key, str):
raise TypeError("key must be a string")
if not ciphertext:
raise ValueError("ciphertext is empty")
if not key:
raise ValueError("key is empty")
key = key.lower()
ciphertext_iterator = 0
key_iterator = 0
plaintext = ""
while ciphertext_iterator < len(ciphertext):
if (
ord(ciphertext[ciphertext_iterator]) < 97
or ord(ciphertext[ciphertext_iterator]) > 122
):
plaintext += ciphertext[ciphertext_iterator]
else:
plaintext += chr(
(ord(ciphertext[ciphertext_iterator]) - ord(key[key_iterator])) % 26
+ 97
)
key += chr(
(ord(ciphertext[ciphertext_iterator]) - ord(key[key_iterator])) % 26
+ 97
)
key_iterator += 1
ciphertext_iterator += 1
return plaintext
if __name__ == "__main__":
import doctest
doctest.testmod()
operation = int(input("Type 1 to encrypt or 2 to decrypt:"))
if operation == 1:
plaintext = input("Typeplaintext to be encrypted:\n")
key = input("Type the key:\n")
print(encrypt(plaintext, key))
elif operation == 2:
ciphertext = input("Type the ciphertext to be decrypted:\n")
key = input("Type the key:\n")
print(decrypt(ciphertext, key))
decrypt("jsqqs avvwo", "coffee")