Once you've finalized your Web document, you might consider adding a digital signature, an electronic, secure stamp of authentification on a document. When you apply your digital signature to a document, you verify the contents of the file and confirm that the file has not changed since you attached the signature. If someone modifies the file, the digital signature is removed. When you add a digital signature to your file, you can sign either a file or a macro project. Sign a file when you are working with an unconverted PowerPoint presentation; sign a macro project when you are working with a presentation that has been converted to a Web page. Sign a File -
| Click the Tools menu, and then click Options. | -
| Click the Security tab, and then click Digital Signatures. | -
| Click Add. | -
| Click a certificate in the Select Certificate dialog box, and then click OK. | -
| Click OK. | Important Information Before You Add a Digital Signature Before you can add a digital signature, you must install and run the Selfcert.exe file. This file enables you to create a digital signature that you will apply to your Web document. To install the file, insert your Office CD into your CD-ROM drive, run the Setup program, click the Add Or Remove Features option, if necessary, click Next, click the plus sign (+) next to Office Shared Features to expand the option, click the Digital Signatures for VBA Projects list arrow, and then click Update. To run the Selfcert.exe file, start Windows Explorer, and then double-click the Selfcert.exe file. The program is typically located in the Program Files\Microsoft Office\Office folder. In the Create Digital Certification dialog box, type your name , and then click OK. | Sign a Macro Project -
| Click the Tools menu, point to Macro, and then click Visual Basic Editor. | -
| Verify that the the name of your file is in the left pane of the Visual Basic window. | -
Click the Tools menu in the Microsoft Visual Basic window, and then click Digital Signature. The Digital Signature dialog box appears, indicating that no certificate is assigned to the document. -
| Click Choose. | -
| Select a certificate in the list, and then click View Certificate. | -
| Click OK. | -
| Click OK. | -
| Click OK. | -
| Click the Close button in the Microsoft Visual Basic window. | -
| Click the Save button to save the presentation. | |