Is a digital signature secure?

A digital signature—a type of electronic signature—is a mathematical algorithm routinely used to validate the authenticity and integrity of a message (e.g., an email, a credit card transaction, or a digital document). Digital signatures generate a virtual fingerprint that is unique to a person or entity and are used to identify users and protect information in digital documents or messages. In emails, the email content itself becomes part of the digital signature. Digital signatures are considerably more secure than other forms of electronic signatures.