code: def _decrypt(self, value, encrypted_value):
          
  
          if sys.platform == 'win32':
              return self._decrypt_windows_chrome(value, encrypted_value)
  
          if value or (encrypted_value[:3] != b'v10'):
              return value
  
          # Encrypted cookies should be prefixed with 'v10' according to the
          # Chromium code. Strip it off.
          encrypted_value = encrypted_value[3:]
          encrypted_value_half_len = int(len(encrypted_value) / 2)
  
          cipher = pyaes.Decrypter(pyaes.AESModeOfOperationCBC(self.key, self.iv))
          decrypted = cipher.feed(encrypted_value[:encrypted_value_half_len])
          decrypted += cipher.feed(encrypted_value[encrypted_value_half_len:])
          decrypted += cipher.feed()
          return decrypted.decode("utf-8")
docs: Decrypt encoded cookies