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Telnet was created years ago when terminal emulation was the only way to access another computer. It is a protocol designed to allow remote clients to connect to servers and initiate terminal emulation. Terminal emulation means that you create a virtual session between the client and a remote server, allowing the client computer to issue commands to the remote server as if the commands were being typed from a dumb terminal directly connected to the server. This feature proves useful when users need access to resources on other computers that are physically distant. Telnet capabilities can be combined with other programs, such as FTP, so that users can issue local commands on a remote server as well as move files between the two hosts.

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Denying Write permissions for a file also makes it unencryptable by the users or groups within the scope of the denial. Simply attributing the file as read-only, however, does not prevent encryption. A user who has Write permissions can encrypt read-only files. In most cases, the best solution is to disable EFS for a folder rather than an individual file.

18:

and how it is done are addressed. Communication between any two computers on a network can be in one of three modes: simplex, half-duplex, or full-duplex.

To disable encryption within a folder, create a file called Desktop.ini that contains:

Save the file in the directory in which you want to disable EFS. If a user attempts to encrypt the folder or any files in the folder, a message tells the user that An error occurred applying attributes to the file: filename. The directory has been disabled for encryption. Note The Desktop.ini file affects only the current folder and the files in it. If you create a subfolder, both the subfolder and any files in it can be encrypted. Also, encrypted files can be copied or moved, without losing their encryption, into the directory that contains the Desktop.ini file.

A registry entry must be added to disable EFS for a stand-alone computer. To disable EFS on a stand-alone computer by editing the registry 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 EfsConfiguration for the value name and 1 for the value data to disable EFS. (A value of 0 enables EFS.) 5. Restart the computer. 6. If EFS is disabled and a user tries to encrypt a file or folder, a message tells the user that An error occurred applying attributes to the file: filename. The directory has been disabled for encryption. Note 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.

receiver. This mode is almost entirely passive: The receiver takes no action during the communication process. On most networks, this form of communication is not widely used.

Part III:

Encryption is a sensitive operation. It is important that encrypted data not become decrypted inadvertently. To this end, observe the following best practices:

The most important practice is to have users export their EFS certificates and private keys to removable media, and store the media securely It is best if users do not remove the private keys from their computers because they will not be able to decrypt any files without importing the private key The most common EFS-related problem that users encounter is the inability to decrypt files after losing access to the EFS private key in the user profile Users who switch between operating systems can also benefit from exporting their EFS certificates and private keys If both operating systems can use EFS, users can import their certificates and keys This enables them to access their encrypted files when they are logged on to either operating system Export the private keys for recovery accounts, store them in a safe place on secure media, and remove the keys from computers.

G When a half-duplex communications process is negotiated, each of the com-