An advanced electronic signature shall meet the following requirements:
(a)
it is uniquely linked to the signatory;
(b)
it is capable of identifying the signatory;
(c)
it is created using electronic signature creation data that the signatory can, with a high level of confidence, use under his sole control; and
(d)
it is linked to the data signed therewith in such a way that any subsequent change in the data is detectable.