Microsoft Office Tutorials and References
In Depth Information
Attaching a Digital Signature to a File
Figure 20-12 Use the Sign dialog box to enter your purpose for signing and complete the
The Signature Confirmation dialog box lets you know that your signature has been saved
with the document. If the document is changed after this point, the signature will no longer
be valid and you will need to re-sign the document.
At this point, you’ve successfully created an unauthenticated digital certificate that you can
use to sign your documents.
Attaching a Digital Signature to a File
After you create or obtain a digital certificate, you can authenticate your files by digitally
signing them. Basically, digitally signing a file means that you’ve attached your digital
certificate to the document. In the last section, you saw how Word 2010 automatically applies
the newly created digital ID to the currently open document. If you want to attach your
digital signature to another file, follow these steps:
1. Open the document you want to digitally sign.
2. On the File tab, click Protect Document on the Info tab and click Add A Digital
Signature. Click OK in the message box that appears.
3. The Sign dialog box is displayed. Type the purpose for signing the document and
verify that the Signing As value is correct.
4. Click the Sign button to attach your signature to the document.
How Can I Tell that a Document Has Been Digitally Signed?
When a digital signature has been added to a document, a small red symbol appears in
the status bar of your Word document. When you position the mouse pointer over the
symbol, the ToolTip displays the message, “This document contains signatures.” To
display information about the signatures, click the symbol once. Signatures are displayed
in the Signatures pane along the right side of the Word window.
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