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So far, all the examples have assumed that the user is authenticated before any profile information is accessed or stored. Usually, this is the case. However, sometimes it s useful to create a temporary profile for a new, unknown user. For example, most e-commerce websites allow new users to begin adding items to a shopping cart before registering. If you want to provide this type of behavior and you choose to store shopping cart items in a profile, you ll need some way to uniquely identify anonymous users. ASP.NET provides an anonymous identification feature that fills this gap. The basic idea is that the anonymous identification feature automatically generates a random identifier for any anonymous user. This random identifier stores the profile information in the database, even though no user ID is available. The user ID is tracked on the client side using a cookie (or in the URL, if you ve enable cookieless mode). Once this cookie disappears (for example, if the anonymous user closes and reopens the browser), the anonymous session is lost and a new anonymous session is created. Anonymous identification has the potential to leave a lot of abandoned profiles, which wastes space in the database. For that reason, anonymous identification is disabled by default. However, you can enable it using the <anonymousIdentification> element in the web.config file, as shown here: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> ... <system.web> <anonymousIdentification enabled="true" /> ... </system.web> </configuration>

Public Shared Property ProtectKey() As Boolean Get Return _ProtectKey End Get Set _ProtectKey = Value End Set End Property Public Shared Sub GenerateKey(ByVal targetFile As String) End Sub Public Shared Sub ReadKey(ByVal algorithm As SymmetricAlgorithm, ByVal file As String) End Sub Public Shared Function EncryptData(ByVal data As String, ByVal keyFile As String) As Byte() End Function Public Shared Function DecryptData(ByVal data As Byte(), ByVal keyFile As String) As String End Function End Class The class offers a possibility for specifying the name of the algorithm (DES, TripleDES, RijnDael, or RC2) through the AlgorithmName property. It also supports operations for generating a new key, reading this key from the file specified directly into the key property of an algorithm instance, and encrypting and decrypting data. For using this class, you must set the algorithm name appropriately and then generate a key if none exists already. Then you just need to call the EncryptData and DecryptData methods, which internally will call the ReadKey method for initializing the algorithm. The ProtectKey property allows the user of the class to specify whether the key should be protected through the DPAPI. You can generate encryption keys through the algorithm classes. The GenerateKey method looks like this: Public Shared Sub GenerateKey(ByVal targetFile As String) ' Create the algorithm Dim Algorithm As SymmetricAlgorithm = SymmetricAlgorithm.Create(AlgorithmName) Algorithm.GenerateKey() ' Now get the key Dim Key As Byte() = Algorithm.Key If ProtectKey Then ' Use DPAPI to encrypt key Key = ProtectedData.Protect(Key, Nothing, DataProtectionScope.LocalMachine) End If ' Store the key in a file called key.config Using fs As New FileStream(targetFile, FileMode.Create)

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One quick way to fill all the methods with exception-throwing logic is to right-click ProfileProvider in the class declaration and choose Refactor Implement Abstract Class.

You also need to flag each profile property that will be retained for anonymous users by adding the allowAnonymous attribute and setting it to true. This allows you to store just some basic information and restrict larger objects to authenticated users. <properties> <add name="Address" type="Address" allowAnonymous="true" /> ... </properties> The <anonymousIdentification> element also supports numerous optional attributes that let you set the cookie name and timeout, specify whether the cookie will be issued only over an SSL connection, control whether cookie protection (validation and encryption) is used to prevent tampering and eavesdropping, and configure support for cookieless ID tracking. Here s an example: <anonymousIdentification enabled="true" cookieName=".ASPXANONYMOUS" cookieTimeout="43200" cookiePath="/" cookieRequireSSL="false" cookieSlidingExpiration="true" cookieProtection="All" cookieless="UseCookies"/> For more information, refer to the configuration settings for forms authentication ( 20) and role management ( 23), which use the same settings.

fsWrite(Key, 0, KeyLength) End Using End Sub The GenerateKey() method of the SymmetricAlgorithm class generates a new key through cryptographically strong random number algorithms and initializes the Key property with this new key If configured appropriately, it encrypts the key using the DPAPI The ReadKey method reads the key from the file created by the GenerateKey method, as follows: Public Shared Sub ReadKey(ByVal algorithm As SymmetricAlgorithm, ByVal keyFile As String) Dim Key As Byte() Using fs As New FileStream(keyFile, FileModeOpen) Key = New Byte(fsLength - 1) {} fsRead(Key, 0, CInt(fsLength)) End Using If ProtectKey Then algorithmKey = ProtectedDataUnprotect(Key, Nothing, DataProtectionScopeLocalMachine) Else algorithmKey = Key End If End Sub If the key was protected previously, the ReadKey method uses the DPAPI for unprotecting the encrypted key when reading it from the file.

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