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Windows XP Professional stores a user s public key certificates in the user s personal certificate store. Certificates are stored in plaintext because they are public information, and they are digitally signed by certification authorities to protect against tampering. User certificates are located in the RootDirectory\Documents and Settings\username \Application Data\Microsoft\SystemCertificates\My\Certificates folder for each user profile. These certificates are written to the user s personal store in the system registry each time the user logs on to the computer. For roaming profiles, users certificates are located on the domain controller and follow users when they log on to different computers in the domain.

17, Remote Access and Virtual Private Networking ) and for normal TCP/IP communications. IPSec configuration for standard TCP/IP traffic is done by setting a system policy, which allows IPSec to be configured for all computers within a domain or organizational unit as well as on a per-computer basis. To configure IPSec policies on a Windows XP computer, open Local Security Policy from the Administrative Tools folder. Select IP Security Policies On Local Computer in the left pane to view the default IPSec policies that come with Windows XP, as shown in Figure 20-5.

Private keys for the Microsoft RSA-based cryptographic service providers (CSPs), including the Base CSP and the Enhanced CSP, are located in the user profile under RootDirectory\Documents and Settings\username\Application Data\Microsoft \Crypto\RSA. In the case of a roaming user profile, private keys reside in the RSA folder on the domain controller and are downloaded to the user s computer until the user logs off or the computer is restarted. Because private keys must be protected, all files in the RSA folder are automatically encrypted by using a random symmetric key called the user s master key. The user s master key is 64 bytes in length and is generated by a strong random number generator. 3DES keys are derived from the master key and are used to protect private keys. The master key is generated automatically and is periodically renewed. It encrypts each file in the RSA folder automatically as the file is created.

Part III:

For more information about CryptoAPI, see the Microsoft Platform SDK link on the Web Resources page at http://www.microsoft.com/windows/reskits /webresources. For more information about Data Protection API, see the Technet link on the Web resources page at http://www.microsoft.com/windows/reskits/webresources. Caution

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The RSA folder must never be renamed or moved. This is the only place the CSPs look for private keys. If you need additional protection for this folder, the administrator can provide additional file system security for users computers or use roaming profiles.

the text box will suggest and append URLs based on the letters the user types. You ll now wire this form to the application using a new menu called Navigate.

The Data Protection API automatically encrypts the user s master key or keys. Master keys are stored in the user profile under RootDirectory\Documents and Settings\username\Application Data\Microsoft\Protect. For a domain user who has a roaming profile, the master key is located in the user s profile and is downloaded to the user s profile on the local computer until the computer is restarted. While the user is logged on, when a master key is not being used for a cryptographic operation, it is encrypted and stored on disk. Before master keys are stored, they are 3DESencrypted using a key derived from the user s password. When a user changes his or her logon password, master keys are automatically unencrypted and re-encrypted using the new password.

Figure 20-5.

If a logon password is forgotten or if an administrator resets a user password, the user s master keys become inaccessible. Because the decryption key is derived from the user s password, the system is unable to decrypt the master keys. Without the master keys, EFS-encrypted files are also inaccessible to the user and can be recovered only by a data recovery agent, if one has been configured, or through the use of a password reset disk (PRD), if one has been created. For more information, see article 290260, EFS, Credentials, and Private Keys from Certificates Are Unavailable After a Password Is Reset, in the Microsoft Knowledge Base at http:// support.microsoft.com. Note

The password reset disk feature is available for local accounts only. Domain account passwords cannot be backed up by using a PRD.