An advanced electronic signature shall meet the following requirements:

1. (a)

   it is uniquely linked to the signatory;

2. (b)

   it is capable of identifying the signatory;

3. (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

4. (d)

   it is linked to the data signed therewith in such a way that any subsequent change in the data is detectable.