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Viruses are one of the most common, and insidious, threats to system security. They can be transmitted via e-mail, via removable media, or can even be deposited on unsecured network shares by Internet worms. Using quality antivirus software with Windows XP is critical to maintaining the security and integrity of your system. The most effective antivirus programs are designed to automatically scan all files as they are created, read, or otherwise accessed, allowing them to be quarantined before any harmful acts can take place. Quality antivirus software should be able to handle macro viruses as well as executable viruses and should also include the ability to integrate with your e-mail application to scan attachments and e-mail messages before they are opened.

In some situations, EFS might not operate as expected. Some EFS issues can be resolved very simply, while others require complex high-level administrative solutions. Understanding how EFS works is the basis for resolving EFS issues. This section presents some common situations that might arise with EFS and the most likely causes for these problems. For more information about troubleshooting EFS, see Windows XP Professional Help and Support Center.

If you find that you are unable to encrypt files or folders, one of the following might be the cause:

The file is not an NTFS volume. You do not have Write access to the file. If you are having trouble encrypting a remote file, check to see that your user profile is available for EFS to use on that computer (which typically means having a roaming user profile), make sure the remote computer is trusted for delegation, and make sure your account is configured to enable delegation. Sensitive accounts are not enabled for delegation by default, so users like Enterprise Administrator might not be able to encrypt or decrypt files remotely.

When using antivirus software, you must keep the antivirus pattern files updated! Pattern files tell the antivirus scanning engines how to detect the latest viruses, and out-of-date pattern files leave Windows XP nearly as vulnerable as if you were using no antivirus software at all. Many antivirus applications include the ability to automatically download pattern updates from the manufacturer on a regular basis. When choosing an antivirus package, be sure to select a recent version that is certified to work with Windows XP. There are a number of vendors of quality antivirus tools on the market.

Part III:

Sometimes users think that a file is not encrypted because they can open it and read the file. You can verify whether a file is encrypted by checking the file s attributes.

For more information about formatting volumes as NTFS, see Windows XP Professional Help and Support Center. For more information about the encryption process, requirements, and procedures, see Encrypting and Decrypting by Using EFS earlier in this chapter. For more information about remote EFS operations, see Remote EFS Operations in a File Share Environment earlier in this chapter.

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Many of the most publicized security attacks of recent memory have come from selfpropagating worms that use e-mail as their delivery mechanism. More traditional viruses can also use e-mail to deliver their payloads by exploiting the scripting functionality built into recent e-mail applications such as Outlook and Outlook Express. Follow these practices to protect yourself from these threats:

The following are the major causes of and solutions for remote decryption failure (usually indicated by an Access is denied message):

The computer on which the encrypted file is stored is not trusted for delegation. Every computer that stores encrypted files for remote access must be trusted for delegation. To check a computer s delegation status, open the computer s properties sheet in the Active Directory Users and Computers snap-in. The user account that EFS needs to impersonate cannot be delegated. To check a user s delegation status, open the user s Properties sheet in the Active Directory Users and Computers snap-in. The user s profile is not available. Using roaming user profiles is the solution for this problem. One of the user s profiles is available, but it does not contain the correct private key. Using roaming user profiles is the solution for this problem.

For more information about the decryption process, requirements, and procedures, see Encrypting and Decrypting by Using EFS earlier in this chapter. For more information about remote EFS operations, see Remote EFS Operations in a File Share Environment earlier in this chapter.

updated Outlook and Outlook Express to reduce their vulnerability to virus and worm attacks via e-mail, and patches continue to be released as new vulnerabilities are detected.