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I then wrote a number of command-line scripts to mount the encrypted containers as virtual drives and mount the database files subsequently in SQL Server. I also created scripts to perform the opposite operation to dismount the containers cleanly and secure them once processing was complete. This worked well. BestCrypt enforces the entry of the key each time a device is mounted, the value of which should obviously remain closely guarded. The key was subsequently changed once my work was completed, meaning only a handful of people had access to the data. A big boost to BestCrypt s security comes inherently as a consequence of its design. Should the server be powered off for any reason (including being stolen), the containers remain unmounted at next boot, because the secure containers must be mounted before they can be used, and the mount operation requires entry of the key. This makes the holder of the key rather than the technology supporting it the weakest point of the security chain.

s with most areas of SQL Server, the security features built into SQL Server 2005 have undergone a fairly radical overhaul. In this chapter, we ll show you the new features for granting and denying permissions to access resources in the database, and the new system of schemas, which now resemble ANSI SQL schemas far more closely. Schemas provide a new level in the security hierarchy (below the database level), with each database object now belonging to a schema rather than being owned by an individual user. As well as these recastings of familiar aspects of SQL Server technology, there are entirely new features: the Surface Area Configuration feature that disables certain functionality that could open security liabilities unless it s explicitly enabled; and the new encryption functions that allow us to encrypt and decrypt data from within T-SQL code. In addition, the new functionality of SQL Server brings new security challenges, so you ll see how you can use Code Access Security with .NET assemblies in SQL Server, and how to use certificates to secure HTTP web services. In summary, in this chapter we ll look at Surface Area Configuration Principals and securables Permissions Code Access Security Encryption Certificates and web services But first:

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The sa account still exists in SQL Server 2005, but, as in SQL Server 2000, Microsoft recommends that you use the sysadmin fixed server role instead, which has the same (unlimited) powers. In addition, SQL Server installation now enforces a password for the sa account, so SQL Server installations with a blank sa password are at last a thing of the past!

Summary

IsUpdatedColumn works like UPDATED in T-SQL triggers. It takes an int representing the zerobased ordinal of the column and returns a bool value signifying whether or not that column has been changed. The number of columns can be retrieved through the ColumnCount property of the SqlTriggerContext class, and this allows you to loop through the columns to test which ones have been updated.

To ensure that SQL Server is as secure as possible out of the box, a number of features that represent potential security risks are disabled by default, and must be explicitly enabled before they can be used. These features include the following:

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