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Since the nonce value changes with each authentication request, the digest is not very useful to an attacker The original password cannot be extracted from it Similarly, because it incorporates a random nonce, the digest cannot be used for replay attacks, in which an attacker attempts to gain access at a later time by resending a previously intercepted digest In theory, Digest authentication is a standard, and web servers and web browsers should all be able to use Digest authentication to exchange authentication information Unfortunately, Microsoft interpreted a part of the Digest authentication specification in a slightly different way than other organizations, such as the Apache Foundation (which provides the Apache web server) and the Mozilla project (which provides the Mozilla web browser) Currently, IIS Digest authentication works only with Internet Explorer 50 and later.

Fill()

Executes a SQL SELECT command (as specified by the SelectCommand property) to query the database for data and loads the data into a DataTable. Establishes the SQL commands that you will issue to the data store when the Fill() and Update() methods are called.

Another limitation of Digest authentication in IIS is that it will function only when the virtual directory being authenticated is running on or controlled by a Windows Active Directory domain controller..

SelectCommand InsertCommand UpdateCommand DeleteCommand Update()

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Integrated Windows authentication is the most convenient authentication standard for WAN-based/ LAN-based intranet applications, because it performs authentication without requiring any client interaction When IIS asks the client to authenticate itself, the browser sends a token that represents the Windows user account of the current user If the web server fails to authenticate the user with this information, a login dialog box is shown where the user can enter a different user name and password For integrated Windows authentication to work, both the client and the web server must be on the same local network or intranet That s because integrated Windows authentication doesn t actually transmit the user name and password information Instead, it coordinates with the domain server or Active Directory instance where it is logged in and gets that computer to send the authentication information to the web server.

Executes SQL INSERT, UPDATE, and DELETE commands (as specified by the InsertCommand, UpdateCommand, and DeleteCommand properties) to persist DataTable changes to the database.

public class UserServiceTest extends BaseSpringTestCase {

The protocol used for transmitting authentication information is either NTLM (NT LAN Manager) authentication or Kerberos 5 depending on the operating system version of the client and the server If both are running Windows 2000 or higher and both machines are running in an Active Directory domain, Kerberos is used as the authentication protocol; otherwise, NTLM authentication will be used Both protocols are extremely secure (Kerberos is the most secure protocol currently available), but they are limited Therefore, in general, integrated authentication works only on Internet Explorer 20 or higher (integrated Windows authentication is not supported in non Internet Explorer clients) Kerberos, of course, works only for machines running Windows 2000 or higher, and neither protocol can work across a proxy server In addition, Kerberos requires some additional ports to be open on firewalls.

Notice that a data adapter defines four properties: SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand. When you create the data adapter object for your particular data provider (e.g., SqlDataAdapter), you can pass in a string that represents the command text used by the SelectCommand s command object. Assuming each of the four command objects has been properly configured, you can then call the Fill() method to obtain a DataSet (or a single DataTable, if you wish). To do so, you have the data adapter execute the SQL SELECT statement specified by the SelectCommand property. Similarly, if you wish to persist a modified DataSet (or DataTable) object back to the database, you can call the Update() method, which will use any of the remaining command objects, based on the state of each row in the DataTable (you ll learn more about this in a bit). One of the strangest aspects of working with a data adapter object is the fact that you are never required to open or close a connection to the database. Rather, the underlying connection to the database is managed on your behalf. However, you will still need to supply the data adapter with a valid connection object or a connection string (which you will use to build a connection object internally) to inform the data adapter exactly which database you wish to communicate with.

In the following section, you will learn the basics of the authentication protocols used for integrated Windows authentication These concepts will help you understand the configuration steps, especially for impersonation and delegation..

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