Microsoft Office Tutorials and References
In Depth Information
Using digital signatures
Figure 4-8 The Document Inspector examines the hidden places in your workbooks where
personal data can hide.
As you can see in Figure 4-8, data is slippery stuff. The Document Inspector searches and
reports on what it finds, as shown on the dialog box on the right of Figure 4-8. You can
then click any Remove All button that appears or close the dialog box and edit the area in
question. Most of these items are usually perfectly benign, of course. You probably don’t
want to purge your headers and footers, for example, unless they contain your address or
Social Security number. But if you are sharing data with others, the Document Inspector
gives you a quick and easy way to find forgotten personal data you might not otherwise
have found.
Using digital signatures
Digital signatures are similar to handwritten signatures in that both are intended to provide
authenticity to documents. However, although the digital version might include a graphic
representation of an actual signature, it also uses cryptography to establish not only a
document’s authenticity but also the integrity of the file and the identity of the signer. You
can add signatures to your own documents and to others’ as well. One way to use
signatures is to verify that others have read a document (or at least opened it) by adding their
signatures.
One important fact about digital signatures is that when you digitally sign a workbook,
Excel saves it as a read-only document, preventing you from making further changes.
Adding a handwritten signature, being typically the last element you add before sending a
letter, in this case ensures that it actually is the last step you perform in a workbook. But don’t
worry—you can remove and reapply a signature if you need to make changes.
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