Theoretically, any file type can be digitally signed
The areas of application of the digital signature are diverse. Electronic invoices are usually signed, here the most common file types are .pdf, .doc, .txt, .xml and .html
How to sign .xml files? Find out here!
Furthermore, websites (.htm, .html files) and emails are signed. Signed emails have the signature as an attachment to the actual email.
However, programs can also be signed. The advantage is that when the program starts, you can see who the program came from, which means you are better protected against spyware or other unwanted programs. Starting with the Microsoft XP operating system, a valid signature is automatically checked when the program starts.
Other areas of application for signed files include electronic archives or medical histories. Here, the signature has the advantage that subsequent changes to the files and thus any falsifications can be recognized immediately.
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