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MCSE : Security Specialist Given a scenario, predict the effects of a particular security implementation on network performance. Encryption Windows 2000 The Encrypting File System (EFS) provides the core file encryption technology used to store encrypted files on NTFS file system volumes. Once you encrypt a file or folder, you work with the encrypted file or folder just as you do with any other files and folders. Encryption is transparent to the user that encrypted the file. This means that you do not have to decrypt the encrypted file before you can use it. You can open and change the file as you normally do. However, an intruder who tries to access your encrypted files or folders will be prevented from doing so. An intruder receives an access denied message if the intruder tries to open, copy, move, or rename your encrypted file or folder. You encrypt or decrypt a folder or file by setting the encryption property for folders and files just as you set any other attribute such as read-only, compressed, or hidden. If you encrypt a folder, all files and subfolders created in the encrypted folder are automatically encrypted. It is recommended that you encrypt at the folder level. You can also encrypt or decrypt a file or folder using the command-line function cipher. For more information about the cipher command, type cipher /? at a command prompt. Main points about EFS Only files and folders on NTFS volumes can be encrypted. You cannot encrypt files or folders that are compressed. First you must uncompress the file or folder, then you can encrypt it. On a compressed volume, uncompress folders you want to encrypt. You cannot share encrypted files. Encrypted files can become decrypted if you copy or move the file to a volume that is not an NTFS volume. Use cutting and pasting to move files into an encrypted folder. If you use a drag-and-drop operation to move the files, they will not automatically be encrypted in the new folder. System files cannot be encrypted. Encrypting a folder or file does not protect against deletion. Anyone with delete permission can delete encrypted folders or files.