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Encryption and decryption are the primary tasks of EFS. Several encryption and decryption options are available to users. Users can encrypt and decrypt files using My Computer, the cipher command, or the shortcut menu accessed by right-clicking a file or folder. EFS also allows users to encrypt offline files. Additionally, EFS provides several options for users to determine the encryption status of files and folders.

Individual files and file folders (or sub-folders) on NTFS volumes can be encrypted. Although it is common to refer to file folders with the encryption attribute set as encrypted, the folder itself is not encrypted. When encryption is set for a folder, EFS automatically encrypts all new files created in the folder and all files copied or moved into the folder by using My Computer. Offline Files can also be encrypted. Note When offline files are encrypted, the entire offline files database is encrypted rather than individual files. Individual files do not display the encryption attribute. The database is encrypted using the system s startup key.

Instant messaging is probably one of the most popular and used features of Windows Messenger. With instant messaging, you can instantly communicate with someone using a chat-like format without having to actually enter a public chat room and deal with all of the nuisances you might find there, such as congestion and lack of privacy. With instant messaging, you simply identify the contact, type the message, and send it. The contact s computer then signals that a message is incoming; the contact opens it, and then responds directly to you. It is much faster than e-mail and allows you to talk in real time. To create an instant message, follow these steps:

The dialog boxes you create help the user interact with the software. They are additional forms you add to your application. In the following sections, you ll add two dialog boxes to your Web browser: an About dialog box and a Navigate dialog box.

System files and any files in the systemroot folder or its subfolders cannot be encrypted. No files or directories in a roaming user profile can be encrypted. A file cannot be both compressed and encrypted. Being compressed does not prevent encryption, but when the file is encrypted, it is uncompressed.

EFS uses a combination of public key and symmetric key encryption to ensure that files are protected from all but the most computationally infeasible methods of attack. Public key encryption algorithms use asymmetric keys for encryption and decryption, which means that different keys are used to encrypt and decrypt the same data. Public key encryption involves the use of a private key (which is held only by its owner) and a public key (which is publicly available on the network). Information that is encrypted by using the public key can be decrypted only by using the corresponding private key. The two keys together are called a key pair or a key set.

Messenger window, and click Send An Instant Message. (If the person appears in your Offline list, you can still right-click the name and select Send E-mail to perhaps send a message that asks the person to send you an instant message when he or she is back online.)

Part III:

Asymmetric cryptography, however, requires a significant amount of processing time for its mathematical operations. Public key operations are often used as part of initial key exchange or key protection operations. As soon as possible, cryptographic services change from public key to symmetric operations, in which the same key is used for both encryption and decryption. Compared with public key operations, symmetric encryption is commonly 100 to 1000 times faster. EFS follows the industry standard cryptographic procedure of key encipherment. Data is encrypted using a symmetric file encryption key (FEK) for speed and then the FEK is secured asymmetrically for maximum security. When a user requests that a file be encrypted, EFS uses a uniquely generated FEK to encrypt a file and then encrypts the FEK by using the public key taken from the user s public key certificate. The encrypted FEK is stored in a file header. When a user requests decryption, EFS decrypts the FEK using the user s private key, and then uses the FEK to decrypt the file.