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Although shared key authentication is not completely secure, it does provide more protection than open system authentication. Thus, when combined with Media Access Control (MAC) address filtering, implementing shared key authentication provides a base level of security for wireless networks against novice attackers. If your organization issues laptops to users with wireless network cards, the users will likely install a home wireless network. To ensure that employees do not expose information contained on their laptops to potential attackers, you should create guidelines for installing home wireless networks, and these guidelines should include enabling shared key authentication. WEP also provides data encrypted services by using the same process as defined for shared key authentication. Because only 2^24 (roughly 16 million) initialization vectors exist, if you assume that each packet uses a new initialization vector, the probability is over 50% that one initialization vector will be repeated after about 4500 packets have been transmitted. This is an example of a birthday attack on a cryptography algorithm. Thus, if an attacker can get the access point to send known plaintext (such as ping packets) and then capture all encrypted

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The Designing a Managed Environment book in the Microsoft Windows Server 2003 Deployment Kit, for information about deploying Group Policy The Deployment Guide of the Microsoft Windows 2000 Server Resource Kit, for information about deploying Group Policy and Active Directory The Distributed Systems Guide of the Microsoft Windows 2000 Server Resource Kit, for more information about implementing and troubleshooting IntelliMirror technologies The Change and Configuration Management Guide link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources, for information about deploying IntelliMirror The Designing a Managed Environment volume of the Microsoft Windows Server 2003 Deployment Kit The Designing and Deploying Directory and Security Services volume of the Microsoft Windows Server 2003 Deployment Kit The Group Policy Settings Reference for Windows XP Professional Service Pack 2 spreadsheet, which is available from the Microsoft Download Center (http:// www.microsoft.com/downloads) Group Policy Help, for information about Group Policy IntelliMirror in Windows XP Professional Help and Support Center, for information about user data management, software installation and maintenance, user settings management, and Remote Installation Services (RIS)

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For organizations that support mobile users, important considerations are hardware, power management, and security on portable computers In addition, some administrative concerns are relevant to roaming users in organizations that use roaming user profiles or Folder Redirection Microsoft Windows XP Professional can be configured and administered to provide support for mobile users, and it includes features and tools that are designed specifically for portable computer users In this chapter: Overview of Windows XP Professional Support for Mobile Users 272 Setting Up a Portable Computer 274 Managing Hardware on Portable Computers 277 Configuring Power Management 279 Configuring Roaming User Profiles and Folder Redirection 290 Configuring Offline Files for Portable Computers 295 Securing Portable Computers 303 Using Infrared Hardware and Video Devices with Portable Computers 305 Wireless Networking 307 Additional Resources 310.

Offline Files A Windows XP Professional feature that provides local access to remote files when the local computer is disconnected from the network. This situation might occur during an outage or when a portable computer is removed from the network for mobile use. The user can continue to work with the cached copies of the offline files. Windows XP synchronizes the local and network copies when the computer is reconnected to the network. organizational unit (OU) An object used in Active Directory domains for management and organizational purposes. An OU can be delegated to different administrators who can then manage its contents. OUs can contain network resources such as users, groups, printers, shared folders, and other data.

packets, he will be able to compute the keystream by performing an XOR on the plaintext with the ciphertext. The attacker could then place the keystream in a database organized by the initialization vector. The next time that the attacker intercepts a packet with that initialization vector, he can look up the keystream in the database and decrypt the packet. In addition, a known vulnerability exists in the scheduling algorithm in RC4, meaning that a small subset of initialization vectors will be weak. Researchers at AT&T labs estimate that this vulnerability could be exploited by intercepting as few as 1,000,000 packets. By exploiting this vulnerability, an attacker could retrieve the static WEP key. If the attacker knows what the WEP key is, she can decrypt any packet she wants to view. Most newer, enterprise-oriented access points and wireless network cards are programmed not to use these weak initialization vectors. You can protect your wireless clients that use Windows Server 2003 and Windows XP by using 802.1x.

Ultimately, the security of information stored on laptop computers and mobile devices will rest with how seriously users take securing these assets and how well users follow guidelines and security polices for protecting their laptops. Although you can use technology to secure these devices to a certain extent, you must train users to do their part in securing laptop computers and mobile devices.