When you attach a digital signature to a file, anyone who views the file is notified if modifications were made after you signed it. Modifications invalidate a digital signature.
To attach a digital signature to a file, you must have a digital ID (certificate), which is issued by a certificate authority. A digital ID identifies either an individual or an organization.
When you attach a digital signature to a file, you are helping to ensure that recipients of the file are notified of modifications.
When you attach a digital signature to a set of files, you are helping to ensure that anyone viewing the files knows about any changes that are made to the files after you signed them.
You can add a comment and time stamp to a digital signature.
You can attach a password and a digital signature to a drawing file. The password must be attached first.
