Advanced Electronic Signature

European Union
An Advanced Electronic Signature is

"an electronic signature meeting the following four requirements:


 * 1. uniquely linked to the signatory;
 * 2. capable of identifying the signatory;
 * 3. created using means that the signatory can maintain under his sole control; and
 * 4. linked to the data to which it relates in such a manner that any subsequent change of the data is detectable."