The following table shows a few examples of possible combinations of the different signatures. sproof sign only uses digital signatures and offers the choice between an advanced and a qualified signature.
#PDF SIGNATURE PDF#
However, it is possible to apply multiple digital signatures to a PDF document. As soon as the document is edited, the digital signature is invalid.
A digital signature is also only created for a specific version of a document. The information needed to verify a digital signature is NOT visually attached to the document (in theory, digital signatures can even be "invisible") and is lost when the document is printed and rescanned. After placing the signature card on the document, a digital signature is added to the PDF.ĭigital signatures are created purely digitally. To be able to sign advanced (AES) or qualified (QES), you need a tool like sproof sign. If, for example, an image of the signature is added to the document (with the help of an image editing tool), this is referred to as a simple electronic signature (SES). However, if you sign digitally, you can avoid a media discontinuity and save time.
This is referred to as a media discontinuity (digital - analog - digital). Once the analog signature has been applied, the document must be scanned so that it can be sent in digital form. However, if this is to be applied to a digital document, things can get a bit more complicated.įirst of all, the digital document must be printed out so that it can be signed by hand. There are various types of digital signatures that are used in practice, and there is the well-known manual signature.
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