What is a digital signature?Įxcel uses digital signatures on the workbook contents to help ensure that the workbook has not been modified and saved since it was signed. When a digital certificate is used to sign a file, this ID is stored with the file in a verifiable form so that it can be displayed to a user. The digital certificate contains information about the person to whom the certificate was issued, as well as information about the certifying authority that issued it. To validate a signature, a certifying authority validates information about the creator of the file and then issues the digital certificate. They help to assure you that the file has not been tampered with.Ī digital certificate is an ID that a file carries with it.

More information What is a digital certificate?ĭigital certificates and signatures help to assure you that the file that you are about to use comes from a reliable source. This ensures that you were the last person to make changes to the workbook or macro project. Note that this is the date that the document is signed, not the date that you create the signature box.In Microsoft Office Excel 2003 and in later versions of Excel, you can digitally sign a workbook or code sign your macro project.

The latter simply adds the date of the signature to the signature box. You have two options with check boxes beside them that read 'Allow the signer to add comments in the Sign dialog box' and 'Show sign date in signature line.' The former allows the signer to type information, such as a purpose for signing, when adding a signature.

Select the final options for the signature. You can leave any or all of these blank, but information about the document and the needed signature may be unclear to others viewing the document. You can add the suggested signer's name, the suggested signer's title, the suggested signer's email address and any instructions to the signer. In the menu that appears, click the 'Microsoft Office Signature Line.'įill in the necessary information in the Signature Setup box that appears. Click the drop-down arrow below the 'Signature Line' option within the 'Text' group.

How to insert signature in excel mac