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So, you definitely have to protect the key somehow. You might want to encrypt the key on its own, but then you need another encryption key. Windows supports a built-in mechanism for storing and protecting secrets. This mechanism uses a machine key generated with the system installation for encrypting data. Only the local operating system (the system s local security authority) has access to this machine key. Of course, the machine key is unique for every installation. Windows supports the Data Protection API for protecting data with this key. You don t have direct access to the key when using this API; you just tell the system to encrypt or decrypt something with the machine s key. So, this solves the problem of key management: your application could encrypt the key used by your application through DPAPI. For this purpose, the .NET Framework supports the class System.Security.Cryptography.ProtectedData, which you can use as follows: Dim ProtData As Byte() = ProtectedData.Protect(ClearBytes, Nothing, DataProtectionScope.LocalMachine) Possible scopes are LocalMachine and CurrentUser. While the first option uses the machine key, the second one uses a key generated for the currently logged-on user s profile. (In the case of roaming profiles, this key is machine independent.) If a user is the administrator of the machine and has the necessary know-how, he can decrypt the data by writing a program that calls the previous function. However, this definitely raises the bar and makes it harder to access the key. And if the user is not the administrator and has no permission to use the DPAPI, she cannot decrypt data encrypted with the machine key.

For example, if you want to remove the profile for the current user, you need only a single line of code: ProfileManager.DeleteProfile(User.Identity.Name); And if you want to display the full list of users in a web page (not including anonymous users), just add a GridView with AutoGenerateColumns set to true and use this code:

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indicates the name of the stored procedure that s used to insert and update profile information. The getUserProcedure indicates the name of the stored procedure that s used to retrieve profile information. This design allows you to use the FactoredProfileProvider with any database table. But what about mapping the properties to the appropriate columns You could take a variety of approaches to make this possible, but the FactoredProfileProvider takes a convenient shortcut. When updating, it simply assumes that every profile property you define corresponds to the name of a stored procedure parameter. So, if you define the following properties: <properties> <add name="FirstName"/> <add name="LastName"/> </properties> the FactoredProfileProvider will call the update stored procedure you ve specified and pass the value in for parameters named @FirstName and @LastName. When querying profile information, the FactoredProfileProvider will look for the field names FirstName and LastName. This is similar to the design used by the SqlDataSource and ObjectDataSource controls. Although it forces you to follow certain conventions in your two stored procedures, it imposes no other restrictions on the rest of your database. For example, the update stored procedure can insert the information into any series of fields in any table, and the stored procedure used to query profile information can use aliases or joins to construct the expected table.

Don t use the DPAPI to encrypt information in your database. Although it is easy to use the DPAPI with .NET 2.0, this method has one problem: encrypted data is bound to the machine if you use the DataProtectionScope.LocalMachine setting. Therefore, if the machine crashes and you have to restore your data on another machine, you will lose all the encrypted information. If you use the DPAPI for encrypting the key as described previously, you should have a backup of the key in another secure place. If you want to use the DPAPI in web farm scenarios, you have to run your application under a domain user account and use the key created for the user s profile (DataProtectionScope.CurrentUser). We recommend creating a separate domain for your web farm so that you don t have to use a domain user of your company s internal domain network.

protected void Page_Load(object sender, EventArgs e) { GridView1.DataSource = ProfileManager.GetAllProfiles( ProfileAuthenticationOption.Authenticated); GridView1.DataBind(); } Figure 24-5 shows the result.

The first step of creating the FactoredProfileProvider is to derive the class from ProfileProvider: public class FactoredProfileProvider : ProfileProvider { ... } All the methods that aren't implemented in this example (see Table 24-6) are simply filled with a single line of code that throws an exception.

As mentioned, symmetric encryption algorithms use one key for encrypting and decrypting data. The class you will create basically has the following structure and can be used for encrypting and decrypting string data: Public Class SymmetricEncryptionUtility Dim Shared _ProtectKey As Boolean Dim Shared _AlgorithmName As String Private Sub New() End Sub Private Shared Property AlgorithmName() As String Get Return _AlgorithmName End Get Set _AlgorithmName = Value End Set End Property

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