What are Digital Signatures and how do I add one in my Excel 2007 workbook? A Digital Signature when added to an Excel workbook and sent to a client, it's purpose is to confirm the identity of the person who sent him the workbook. These Digital Signatures are typically issued by a CA or Certification Authority (a trusted third party vendor); however, you can create your own local Digital Signature on your computer. Signatures can be visible or non visible based upon what features you use in Excel to add your Digital Signature. If anyone removes the Digital Signature the signature becomes invalid and hence it would be wise not to trust the Excel workbook.

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