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3DES can be enabled by using the system cryptography Group Policy setting. If this setting is configured for 3DES, IP Security and EFS both use 3DES for encryption. Not all IP Security implementations are capable of encrypting by using 3DES, however. Windows 2000 without the High Encryption Pack, for example, cannot use 3DES. It is also possible to configure EFS to use 3DES without affecting encryption elsewhere. This requires modification of a registry setting. To enable system-wide 3DES by using Group Policy 1. In Computer Configuration, expand Windows Settings, Security Settings, Local Policies, and then expand Security Options. 2. Double-click System cryptography: Use FIPS compliant algorithms for encryption. 3. Select Enabled, and then click OK. To enable 3DES for EFS only, a registry entry must be added. To enable 3DES for EFS only 1. In the Run dialog box, type regedit.exe. 2. Navigate to the subkey HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft \Windows NT\CurrentVersion\EFS. 3. On the Edit menu, point to New and then click DWORD Value. 4. Enter AlgorithmID for the value name and 0x6603 for the value data to enable 3DES. 5. Restart the computer. 6. To disable 3DES and enable DESX, simply delete the AlgorithmID setting and restart the computer. Caution

Do not edit the registry unless you have no alternative. The registry editor bypasses standard safeguards, allowing settings that can damage your system or even require you to reinstall Windows. If you must edit the registry, back it up first.

7. When 3DES is enabled, files encrypted by using both the DESX and 3DES algorithms can be decrypted. However, all new files are encrypted by using the 3DES algorithm.

POP is the most commonly used protocol for allowing graphical clients to view e-mail messages stored on remote mail servers. However, it is being supplanted by IMAP, which is more efficient and more secure than POP.

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If a user needs to access an encrypted file from both Windows 2000 and Windows XP Professional, do not enable the 3DES algorithm. The Windows 2000 operating system does not support the 3DES algorithm by default. However, if the High Encryption Pack has been installed on Windows 2000, it can use 3DES.

If you don t get IntelliSense when typing navigateWindow. txtUrl.Text, be sure you set the Modifiers property on txtUrl to Public as described earlier.

File data is decrypted before it is sent to an application. This means that the file encryption key (FEK) is also decrypted. Although the FEK is not exposed, file data might be. Because the EFS File System Run-Time Library (FSRTL) is located in the Windows operating system kernel and uses the nonpaged pool to store the FEK, FEKs cannot be leaked to paging files. However, because the contents of paging files are not encrypted, the plaintext contents of encrypted files might temporarily be copied to paging files when open for application use. If the plaintext contents of encrypted files are copied to a paging file, the plaintext remains in the paging file until the contents are replaced by new data. Plaintext contents can remain in paging files for a considerable amount of time even after applications close the encrypted files. A paging file is a system file, so it cannot be encrypted. (By default, the name of the paging file is Pagefile.sys.) The file system security for paging files prevents any user from gaining access to and reading these files, and these security settings cannot be changed. However, someone other than the authorized user might start the computer under a different operating system to read a paging file. To prevent others from reading the contents of paging files that might contain plaintext of encrypted files, you can do either of the following: