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Security with Earlier Version Databases
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If you applied user-level security to a database created in an earlier version of Access, that still works when you open the database in Access 2007 If the database has no security applied, it will open in disabled mode In disabled mode, many components are inaccessible: VBA code and any references to code or unsafe expressions Unsafe macro actions, such as those that allow the user to modify the database or access outside resources Action queries that add, update, or delete data Data Definition Language (DDL) queries that create or alter database objects
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SQL pass-through queries that work with tables on the server without using the database itself ActiveX controls You can choose to enable the content each time you open the database or you can apply a digital signature A digital signature is an encrypted electronic stamp that authenticates database components Another option is to place the database in a trusted location
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NOTE If you convert the database to Access 2007, all the security settings are removed and the rules
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for ACCDB and ACCDE files apply instead
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Before you can apply your signature to the database, you need a digital certificate that authenticates the signature If the database is for your own or your organization s use, you can use the SelfCert program to create the signature If the database is for commercial use, you need to get the certificate from a commercial CA To create your self-signed certificate, do the following: 1 Click the Windows Start button and point to All Programs 2 Click the Microsoft Office button, click Microsoft Office Tools, and click Digital Certificate for VBA Projects You ll see the Create Digital Certificate dialog box
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PART IV
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3 In the dialog box, enter a name for the new certificate in the Your Certificate s Name box
Part IV:
Exchange Data with Others
4 Click OK twice A message will inform you that the new certificate was created
Code-Signing the Database
Applying a digital signature to a component is called code-signing You can apply your signature to your database so that other certified users will know it is safe to use When you code-sign your database, the security applies to all objects, not just macros and VBA code modules Open the database that you want to sign, and do the following: 1 On the Database Tools tab s Macros group, click the Visual Basic command 2 In the Microsoft Visual Basic window, select the database Choose Tools | Digital Signature
25:
Secure a Database
3 In the Digital Signature dialog box, click Choose
4 In the Select Certificate dialog box, select your test certificate and click OK twice
PART IV
Access may not be able save your digital signature If a problem occurs, you will see an error message with possible reasons such as these: The database is under Source Code Control The database is opened as read-only The database may be ACCDB or ACCDE file format and you need to use the Publish method to sign it
NOTE For more information about securing databases created in earlier versions of Access, see the
Help topic How security works with databases from earlier versions of Access opened in Office Access 2007
Summary
This chapter briefly scratched the surface of the many new security features provided in Access 2007 Look at the many Help topics for more information about securing your database worldwide
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APPENDIX
Converting to Access 2007
hen Access 2007 arrives, you ll probably want to convert your databases to the new version immediately You can convert from any earlier version of Access with the information presented in this appendix You might, instead, want to keep the database in the earlier version and run it with Access 2007 This is important if your database is accessed by more than one user and if all the users haven t upgraded to Access 2007 yet You can convert an Access database created in Access 95 or later to the Access 2007 file format You can also convert an Access 2007 database file back to an earlier version as long as the ACCDB file does not contain any of the new features such as multivalued fields or attachments
Deciding on a Conversion Strategy
Before setting out to convert the database, you will need to examine the way the database is used currently Most likely, you ll want to convert it to take advantage of the new design features of Access 2007 If necessary, you can open the database and work with it in Access 2007 without conversion If the database is one of the later file formats (2000 or 2002 2003) you will be able to view and edit data as well as make changes to object designs If the database is from Access 95 or 97, you can work with the data, but you won t be able to save changes in the design of any of the objects If you want to modify an object, you must open the database in the original version or convert it to Access 2007 See the section Opening an Earlier Database later in this appendix for more information There are significant differences between the Access 2007 ACCDB file format and the earlier MDB file format You may want to look into the differences before converting a wellestablished database to Access 2007 See the Help topic Differences between the ACCDB and MDB File Formats for details For example, Access 2007 does not support replication or user-level security If your database relies on these, keep the MDB format If your database is shared among several users, not all of whom can convert to the Access 2007 ACCDB format, you can split the database and convert part of it to Access 2007 and keep other parts unchanged This way, the database can be shared by users on different versions of Access Once you convert an MDB file database to ACCDB file, you re no longer able to open it with the original version of Access, but you can convert it back You can convert an Access 2007 database back to Access 2000 or 2002 2003
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