What is a digital signature and what does it do?
In brief, a digital signature is an invisible algorithm that is attached to a document by software installed on a person’s computer and protected by a password. What a digital signature does is verify to the reader that the document was signed by the person who claims to have signed it. While fraud is always possible (even with handwritten signatures on paper), the digital certificate gives “high assurance” that the person is who they say they are.
