I would recommend it, not only for the degree, but because generally University gets you thinking in different ways, questioning things differently and so forth. For ICT Security, you will defininently need it, but keep in mind, its unlikely you will find your ideal IT job right of the bat. You may end do some fairly boring integration testing, or some server configuration etc. And some of your future collegues will get there without the full degree. But your degree will come in useful down the track and ultimately will help open doors that may have been closed to you otherwise.
Regardless, best of luck with whatever path you choose. And always, always, keep on learning.