We get documents in PDF format from the government or other agencies. Some documents come with digital signatures placed on the pages. If they are already validated, we see a Signature Valid message ...

The ability to electronically sign a PDF document is one of the most helpful and impactful developments of the computer age. It speeds up transactions, increases security, and even saves trees by ...

Researchers at the Ruhr-University Bochum in Germany have figured out three different ways to forge digital signatures in PDF documents. The fakes will be treated as genuine on 21 of 22 desktop PDF ...