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Figure 30-20. Opening a digitally signed database with High macro security settings, but you haven t trusted the publisher yet or the signature cannot be authenticated.
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Understanding the macro security settings isn t all you need to know as a developer of Access applications that will be used by others. If you know that all your users are running with Low security, you don t need to do anything at all. If you have users who have selected Medium security, you can instruct them about the security warning that they ll see when they try to open your application. When you have users who must run with macro security set to High, then you must digitally sign your Visual Basic project with a signature that is trusted on those users machines.
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Part 7: After Completing Your Application
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Securing Your Database Your company might already have a public trusted signature that was issued by one of the recognized companies, such as VeriSign. (You can read about the trusted signature products from VeriSign at http://www.verisign.com/products/microsoft/index.html.) Contact your system administrator to find out if your company owns a public certificate that you can use to sign your projects. If your company owns a public certificate, you can sign your projects with that certificate and distribute your database application outside your company with confidence. Your administrator might have created a trusted certificate that is registered on your domain server. You can use that certificate to sign the projects in database applications that you intend to distribute to other users within your company. Microsoft Office 2003 also provides a Digital Certificate utility that allows you to create a local signature that you can use to sign projects on your local machine. This gives you an opportunity to test how signing a database works. To run this utility, click your Windows Start menu, choose All Programs, choose Microsoft Office, choose Microsoft Office Tools, and then click Digital Certificate for VBA Projects. The utility displays a window, as shown in Figure 30-21.
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The bad news is a local certificate works only on your machine. If you give your database application to another user, the user won t be able to trust you as a publisher on his or her machine. However, a local certificate is useful to test signing your database applications and to learn how certificates work with macro security. To sign a database application, you must open any module in the Visual Basic Editor (VBE). The project should be fully compiled and saved before you attempt to sign it. Choose Digital Signature from the Tools menu to see the dialog box shown in Figure 30-22.
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Figure 30-21. The Digital Certificate for VBA Projects utility allows you to create a local signature.
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Part 7: After Completing Your Application
Microsoft Office Access 2003 Inside Out
Part 1: Part Title
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Figure 30-22. Using the Digital Signature facility in the Visual Basic Editor to digitally sign your project.
Click the Choose button to see a list of certificates available on your system, as shown in Figure 30-23. You can select any certificate and click the View Certificate button to view the details about the certificate. In the Select Certificate dialog box, select the certificate you want and click OK to sign your project with that certificate. Keep in mind that once you sign a project, you should make no further design changes before you distribute the database application to others. If you make a design change, Access removes the signature from your project.
Figure 30-23. Viewing the list of available certificates on your machine.
You should now understand the issues surrounding security in both an Access desktop database and a project file. In the final chapter, you ll learn how to set up your application so that you can distribute it to others.
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