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.
A digital ID
contains a name, serial number, expiration date, and other
information that certifies the digital signature. From a
certificate authority, you can obtain digital IDs with a security
level of Low, Medium, or High.
Low. Use a Low security level if you
want to sign multiple files quickly. A digital signature is
automatically attached to all file types that are valid for a
digital signature.
Medium. Use a Medium security level if
you want to be informed when an application is trying to create a
signature with your digital ID. You are notified each time a
digital signature containing your digital ID is attached to a
file.
High. Use a High security level if the
signature is very sensitive and you do not want your computer to be
misused in the signing of a file. You are prompted for a password
each time you sign a file.
