ciphers

# Шифрование Цезаря
def cipher_encrypt(plain_text, key):
    encrypted = ""
    for symbol in plain_text:
        if symbol.isupper():
            symbol_index = ord(symbol) - ord('A')
            symbol_shifted = (symbol_index + key) % 26 + ord('A')
            symbol_new = chr(symbol_shifted)
            encrypted += symbol_new
        elif symbol.islower():
            symbol_index = ord(symbol) - ord('a')
            symbol_shifted = (symbol_index + key) % 26 + ord('a')
            symbol_new = chr(symbol_shifted)
            encrypted += symbol_new
        elif symbol.isdigit():
            symbol_new = (int(symbol) + key) % 10
            encrypted += str(symbol_new)
        else:
            encrypted += symbol
    return encrypted

# Дешифрование Цезаря
def cipher_decrypt(ciphertext, key):
    decrypted = ""
    for symbol in ciphertext:
        if symbol.isupper():
            symbol_index = ord(symbol) - ord('A')
            symbol_og_pos = (symbol_index - key) % 26 + ord('A')
            symbol_og = chr(symbol_og_pos)
            decrypted += symbol_og
        elif symbol.islower():
            symbol_index = ord(symbol) - ord('a')
            symbol_og_pos = (symbol_index - key) % 26 + ord('a')
            symbol_og = chr(symbol_og_pos)
            decrypted += symbol_og

        elif symbol.isdigit():
            symbol_og = (int(symbol) - key) % 10
            decrypted += str(symbol_og)
        else:
            decrypted += symbol

    return decrypted

#XOR
def xor_cipher( str, key ):
    encripted_str = ""
    for letter in str:
        encripted_str += chr( ord(letter) ^ key )
    return  encripted_str


key  = 10

text = input("Сообщение для шифровки: ")
offset = int(input('Шаг шифровки: '))

cipher_text = cipher_encrypt(text, offset)
print("Cipher encrypted:\t", cipher_text)

encrypted_xor = xor_cipher(cipher_text, key )
print( "XOR encript:\t", encrypted_xor )

decripted_xor = xor_cipher(encrypted_xor, key )
print( "XOR decript:\t",  decripted_xor)

decrypted_cipher = cipher_decrypt(decripted_xor, offset)
print("Caesar decript:\t", decrypted_cipher)