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This verifier can be used to authenticate a domain user if the computer is not able to access the domain controller. The password verifier is also commonly called a cached credential. It is computed by taking the NT hash, concatenating the user name to it, and then hashing the result by using the MD4 hash function. In Windows and many other operating systems, one method for authenticating a user's identity is to use a secret passphrase or password. However, password authentication is still required in some scenarios.
Securing your network environment requires that strong passwords be used by all users. This helps avoid the threat of a malicious user guessing a weak password, whether through manual methods or by using tools, to acquire the credentials of a compromised user account. This is especially true for administrative accounts. When you change a complex password regularly, it reduces the likelihood of a successful password attack.
Password policy settings control the complexity and lifetime of passwords. Password policies affect Windows passwords, not necessarily feature passwords. Users' ability to modify their passwords is governed by the password policies and the available interfaces.
For example, through the Secure Desktop, users can change their password at any time based upon the password policies administered by the system administrator or domain administrator. If the user using a local account for authentication, the NT OWF is compared against the locally stored NT hash, and if the two match, the user is logged on. If the user is authenticating against an Active Directory domain by using a host name to access a resource, the NT hash is used in a Kerberos logon against the Key Distribution Center KDC , which is typically the domain controller.
The process starts with the client requesting a challenge from the authentication server. After the challenge is received, the client computes a response to this challenge. This is done by first padding the two hashes of the password with null values to bits. The bits of each hash are then split into three bit DES keys. The six DES keys are then used to encrypt the challenge.
If it is set to 2, only the NTLM response is sent. If it is set to 3 or higher, a new version of both protocols is used. Both protocols use the NT hash to compute the response, and both use a client-side challenge, either instead of or in addition to the server challenge.
Remove Entry. Edit a Entry. This article describes how to manage stored user names and passwords on a computer that is not a member of a domain. When you log on to a Windows XP-based computer, you can supply a user name and password, which becomes your default security context for connecting to other computers on networks and over the Internet.
However, this user name and password may not provide access to all desired resources. The Stored User Names and Passwords feature provides a way to store additional user names and passwords as a part of your profile. Stored User Names and Passwords is a secured store for password information. With this feature, you can type user names and passwords for various network resources and applications such as email one time, and then have Windows automatically supply that information for subsequent visits to those resources without your intervention.
When you first log on to a server or a Web site, you are prompted for your user name and password. When you type your user name and password for the resource, and then click to select the Remember my password check box, your logon information is stored with your user account. When you next connect to the same resource, these stored credentials are used by Windows to automatically authenticate your user account.
When a credential is saved by selecting the Remember my password check box on the user name and password dialog box that you receive when you connect to a resource, the credential are saved in the most general form possible. Saving a different credential for a different server in this domain would not overwrite this credential. The new credential would be saved by the use of more specific information.
When you access a resource, the authentication package searches the Stored User Names and Passwords store for the most specific credential that matches that resource. If one is found, it will be used by the authentication package without any interaction from you.
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