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Chapter 6. Explore Security in Depth >  Add Digital Signatures

6.9. Add Digital Signatures

A digital signature identifies the author of the content or the macros contained in a workbook, template, or add-in. You add a digital signature as the last step before you distribute a file. When others open the a signed file they can see who the author is and therefore decide whether the information in the file is authentic and whether any macros it contains are safe to run.

The signature is overwritten any time a file is saved. Therefore, no one can open a signed file, make changes, save, then send the file on still bearing your signature. Workbooks and macros are signed separately even though they are contained in a single file. If you want to distribute a signed workbook containing macros, you must sign the macros first, then sign the workbook.


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