GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Definition: Llwyddo i sicrhau mynediad heb awdurdod i feddalwedd gyfrifiadurol neu system ddiogelwch gyfrifiadurol gyfan, gyda bwriad maleisus neu droseddol.
