docs: def _decrypt(ascii_armor_message: str, signing_key: SigningKey) -> str:
          """
          Decrypt a message from ascii armor format
  
          :param ascii_armor_message: Utf-8 message
          :param signing_key: SigningKey instance created from credentials
          :return:
          """
          data = signing_key.decrypt_seal(base64.b64decode(ascii_armor_message))
  
          return data.decode('utf-8')