/
ssmih
/
Python
Обзор
Документация
Войти
/
ssmih
/
Python
Код
Запросы
0
Задачи
Вики
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
ciphers/vernam_cipher.py
42 строки
1 KB
Anupamaraie
Create vernam_cipher.py (#10702)
19 окт 2023, 23:05
Не верифицирован
19 окт 2023, 23:05
34f48b6
Код
Авторство
О чём код?
def vernam_encrypt(plaintext: str, key: str) -> str: """ >>> vernam_encrypt("HELLO","KEY") 'RIJVS' """ ciphertext = "" for i in range(len(plaintext)): ct = ord(key[i % len(key)]) - 65 + ord(plaintext[i]) - 65 while ct > 25: ct = ct - 26 ciphertext += chr(65 + ct) return ciphertext def vernam_decrypt(ciphertext: str, key: str) -> str: """ >>> vernam_decrypt("RIJVS","KEY") 'HELLO' """ decrypted_text = "" for i in range(len(ciphertext)): ct = ord(ciphertext[i]) - ord(key[i % len(key)]) while ct < 0: ct = 26 + ct decrypted_text += chr(65 + ct) return decrypted_text if __name__ == "__main__": from doctest import testmod testmod() # Example usage plaintext = "HELLO" key = "KEY" encrypted_text = vernam_encrypt(plaintext, key) decrypted_text = vernam_decrypt(encrypted_text, key) print("\n\n") print("Plaintext:", plaintext) print("Encrypted:", encrypted_text) print("Decrypted:", decrypted_text)