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You can enable Digest Authentication in IIS by selecting the Digest authentication for Windows domain servers check box in the Authenticated access section of the Authentication Methods dialog box (refer to Figure 12-14) Digest Authentication is only available if you re running Active Directory In Digest Authentication, IIS creates a challenge string and sends it to the browser The browser then displays a dialog box where the user may enter the credentials, but it does not send those credentials back to IIS unencrypted Instead, it concatenates the password to the end of the challenge string and hashes the concatenated string This results in a set of characters known as a digest, which is sent back to IIS along with the username IIS receives the digest and the username from the client and retrieves the password for the username from Active Directory.

For even more control, you can configure the SiteMapPath control with styles or even redefine the controls and HTML with templates (see Table 16-7).

All parts of the path except the root and current node. The node representing the current page. The node representing the root. If the root node is the same as the current node, the current node template or styles are used. The separator between each node.

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It then concatenates the password on the end of the challenge it sent the browser and uses the same algorithm as the browser to create a digest of its own If the digest sent back from the browser and the digest created by IIS match, then the user is authenticated because IIS can reasonably assume that the user entered the appropriate password This is more secure than Basic Authentication because the password isn t sent over the network; however, it comes with its own security risks Hackers can use replay attacks to overcome Digest Authentication In a replay attack, hackers use a network scanner to capture a challenge string and the resulting digest They can then replay the captured response, and IIS authenticates them It takes a little more time and effort than stealing the password outright, but it s still effective.

Despite these limitations, hidden form fields remain a popular method for developers to maintain application state ASPNET takes its cue from this and adds a layer of abstraction called view state on top of the HTML form hidden variable mechanism to make life easier on web developers wishing to take advantage of client-side state with a minimal amount of fuss and effort..

For example, the following SiteMapPath uses an arrow image as a separator and a fixed string of bold text for the root node. The final part of the path, which represents the current page, is italicized. <asp:SiteMapPath ID="SiteMapPath1" runat="server"> <PathSeparatorTemplate> <asp:Image ID="Image1" ImageUrl="~/images/arrow.jpg" runat="server" GenerateEmptyAlternateText="True" /> </PathSeparatorTemplate> <RootNodeTemplate> <b>Root</b> </RootNodeTemplate> <CurrentNodeTemplate> <i><asp:Label ID="Label1" runat="server" Text='<%# Eval("title") %>'> </asp:Label></i> </CurrentNodeTemplate> </asp:SiteMapPath> Notice how the CurrentNodeTemplate uses a data binding expression to bind to the title property of the current node. You can also get the url and description attributes that you declared in the site map file in the same way.

In the examples so far, the page controls replicate the structure of the site map file exactly. However, this isn t always what you want. For example, you might not like the way the Home node sticks out because of the XmlSiteMapProvider rule that every site map must begin with a single root. To clean this up, you can set the SiteMapDataSource.ShowStartingNode property to false. Then, modify the site map file so it defines the Home entry in the first group of pages. (The root node won t be shown, so you can use a dummy node with any URL for it.) Here s the revised site map: <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"> <siteMapNode title="Root" description="Root" url="~/"> <siteMapNode title="Home" description="Home" url="~/default.aspx"/> <siteMapNode title="Products" description="Our products" url="~/Products.aspx"> ... </siteMapNode> </siteMap> Figure 16-11 shows the nicer result.

Digest Authentication isn t as widely supported as Basic Authentication, but is more widely supported than Integrated Windows Authentication It does not support delegation and requires Active Directory to store account passwords using reversible encryption because IIS needs the original unaltered password to validate the digest One-way encryption is a more secure password storage format, so you may find some network administrators resistant to the.

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