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Any data recovery agent can recover an encrypted file when a user s private key fails to decrypt the file. To recover an encrypted file 1. Log on to a computer that has access to the user s profile; for example, a computer that belongs to a designated recovery agent or has a recovery key available on removable media such as a floppy disk. You might also log on at the user s computer, or the user might have a roaming profile. 2. Locate the encrypted file. For example, the user might have made a backup of the file by using Backup or sent the file to a WebDAV Web folder. 3. Decrypt the file by using either the cipher command or My Computer. This will make the file available to the user. For more information about decrypting files, see Working with Encryption and Decryption earlier in this chapter.

When an encrypted file is saved, Windows XP Professional automatically provides four levels of encryption and a fifth, the startup key, can be configured. These levels of encryption protect the encryption keys that are used to protect the file: 1. EFS provides the FEK, which encrypts the data in the file. 2. EFS uses the public key in the user s EFS certificate to encrypt the FEK. The public key and certificate are stored by default in the computer s certificate store. The corresponding private key, used to decrypt the FEK, is stored in an encrypted form in the user s profile for the corresponding user or the data recovery agent account in the RSA folder.

One of the most common techniques for violating security and privacy on networks involves intercepting transmissions sent via unencrypted protocols. It s critical to avoid sending personal information, such as credit card numbers, across the network in the clear. It s also important to avoid sending user names and passwords across the network in clear text because a hacker that intercepts them can use the user names and passwords to log on to systems and initiate local attacks or even take complete control. The following practices will help to minimize this threat. Encrypt wireless network traffic whenever possible When using wireless communications, use Wireless Encryption Protocol (WEP) with as large a key length as possible. WEP is hardly perfect because fundamental flaws in WEP s key design allow it to be penetrated by a dedicated hacker with sufficient computing resources. Additionally, it only encrypts communication between wireless network adapters and wireless access points (or between adapters when configured in ad hoc mode). As soon as traffic is bridged to a wired medium, it travels without encryption. However, using WEP definitely reduces the chances that your wireless communications will be easily intercepted and deciphered. See 19, Wireless Networking, for more information about WEP and wireless network configurations. Encrypt all TCP/IP traffic whenever possible The Internet Protocol Security (IPSec) standard provides a uniform process for securely encrypting TCP/IP traffic, including authentication, key negotiation, and packet encryption. Windows XP supports IPSec for both VPN tunneling (via the IPSec/L2TP standard discussed in

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3. The Data Protection API generates the user s master key that is used to encrypt the user s private keys. 4. The Data Protection API generates a symmetric password encryption key, derived from a hash of the file creator s credentials, which encrypts the user s master key. 5. A startup key (also called the syskey) can be used to protect all master keys as well as a variety of other secrets that are stored on computers. At system startup, the startup key is used to encrypt all the private keys on the computer, including private keys that are used for EFS. Startup keys are automatically generated and used for computers in a domain but must be manually configured on stand-alone computers. Startup key security can be increased by storing the key on removable media or by requiring a system startup password. Windows XP Professional provides several configuration options that increase security. To prevent loss of access to your master keys on stand-alone computers, you can create a password reset disk (PRD). To provide stronger encryption for files, you can enable the 3DES encryption algorithm. In addition, you can implement options to prevent your computer from entering hibernation mode and to delete paging files at system shutdown so that data is not needlessly exposed.