) --
        The amount of bytes to discard from the initial part of the keystream.
        In fact, such part has been found to be distinguishable from random
        data (while it shouldn't) and also correlated to key.

        The recommended value is 3072_ bytes. The default value is 0.

:Return: an `ARC4Cipher` object

.. _3072: http://eprint.iacr.org/2002/067.pdf
)