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7. Save the application (pressing Ctrl+Shift+S saves all the files, and pressing Ctrl+S saves the current file), and then press F5 to run it. Look at Figure 6-6 to see the splash screen in action with the dynamic information collected from the Project Designer Application pane.

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When 3DES is enabled, it is used as the encryption algorithm for IP Security as well as for EFS. For more information about configuring 3DES support, see Enabling 3DES later in this chapter.

When 3DES is enabled, all new encryptions are completed by using 3DES. Note that DESX and 3DES are always available for decryption, regardless of the encryption policy. Note

As of Service Pack 1 for Windows XP, the Advanced Encryption Standard (AES) algorithm is used by default for encrypting files with EFS. For more information, see article 329741, EFS Files Appear Corrupted When You Open Them, in the Microsoft Knowledge Base at http://support.microsoft.com.

Securing Your Firewall from Attack Many firewalls, including residential gateways, have features that allow them to be administered and/or updated remotely via the external IP address. It s almost never a good idea to enable these features. If some unknown security vulnerability exists in your firewall device, enabling these features can leave your network open to attack. In fact, even if vulnerabilities do not exist, enabling these features can cause your firewall to respond to a port scan, giving remote attackers validation that your network exists, which is all the encouragement they need to begin probing your defenses further.

The Data Protection API (DPAPI) is a set of function calls that provide data protection services to user and system processes. Applications either pass plaintext data to DPAPI and receive protected data back, or they pass the protected data to DPAPI and receive plaintext data back. For example, after a CSP generates keys for certificates, it calls CryptProtectData(), one of the primary functions of DPAPI, to protect those keys. When the keys are needed, DPAPI decrypts them.

The EFS FSRTL is a module within the EFS driver that implements NTFS callouts to handle various file system operations such as reads, writes, and opens on encrypted files and directories, and operations to encrypt, decrypt, and recover file data when it is written to or read from disk. The EFS driver and FSRTL are implemented as a single component. However, they never communicate directly. They use the NTFS file control callout mechanism to pass messages to each other. This ensures that NTFS participates in all file operations. The operations implemented by using the file control mechanisms include writing the EFS attribute data (DDF and DRF) as file attributes and communicating the FEK computed in the EFS service to FSRTL so that it can be set up in the open file context. This file context is then used for transparent encryption and decryption on writes of file data to disk and reads of file data from disk.

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Most firewall software and devices act as inbound firewalls; that is, they protect a network or a computer from inbound traffic initiated outside the protected computer or network. However, for the highest level of protection, it s wise to stop undesired outbound traffic initiated from computers behind the firewall as well. This will prevent Trojan horse applications, spyware, and other unwanted and undetected applications present on your computer from being able to send data out across the Internet. Most large, dedicated firewall devices for medium-to-large sized networks can be configured to provide both inbound and outbound protection. However, residential gateways, smaller dedicated firewalls, and software solutions such as Windows XP s Internet Connection Firewall (ICF) are not designed to prevent unwanted outbound traffic.

EFS provides an API set to expose its features. This API provides a programming interface for operations such as encrypting plaintext files, decrypting or recovering ciphertext files, and importing and exporting encrypted files (without decrypting them first). The API is remoted to support remote encryption, decryption, backup, and restore operations. The API is supported in a standard system DLL, Advapi32.dll.