def _make_nonce(self):
        '''
        Generate a unique ID for the request, 25 chars in length

        Returns:
            - str: Cryptographic nonce
        '''

        chars = string.digits + string.ascii_letters
        nonce = ''.join(random.choice(chars) for i in range(25))

        if self._logging:
            utils.log('nonce created: %s' % nonce)

        return nonce