Added miznitskiy cipher implementation

ciphers/miznitskiy_cipher.py

@@ -0,0 +1,49 @@
+from string import ascii_uppercase
+
+
+def miznitskiy(text: str, key: str) -> str:
+    """
+    Encrypt plaintext with the Miznitskiy cipher
+    >>> miznitskiy('hello', 'KEY')
+    'XQKKZ'
+    >>> miznitskiy('hello', 'ABCD')
+    'HFMMP'
+    >>> miznitskiy('', 'KEY')
+    ''
+    >>> miznitskiy('yes, ¥€$ - _!@#%?', 'KEY')
+    'YFV, ¥€$ - _!@#%?'
+    >>> miznitskiy('yes, ¥€$ - _!@#%?', 'K')
+    'YDV, ¥€$ - _!@#%?'
+    >>> miznitskiy('yes, ¥€$ - _!@#%?', 'KEYWORD')
+    'YHV, ¥€$ - _!@#%?'
+    >>> miznitskiy('yes, ¥€$ - _!@#%?', '')
+    Traceback (most recent call last):
+      ...
+    ZeroDivisionError: integer modulo by zero
+    """
+    ascii_len = len(ascii_uppercase)
+    key_len = len(key)
+    encrypted_text = ""
+    keys = [ord(char) - ord("A") for char in key.upper()]
+
+    if key_len == 0:
+        raise ZeroDivisionError("integer modulo by zero")
+
+    upper_case_text = text.upper()
+
+    for i, char in enumerate(upper_case_text):
+        if char in ascii_uppercase:
+            shift_amount = keys[i % key_len]
+            new_position = (ascii_uppercase.index(char) + shift_amount) % ascii_len
+            shifted_letter = ascii_uppercase[new_position]
+            encrypted_text += shifted_letter
+        else:
+            encrypted_text += char
+
+    return encrypted_text
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()