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Smart Cards Smart cards are credit card sized pieces of plastic that have a tamper-resistant electronic circuit embedded in them that permanently stores an ID, a password, a digital signature, an encryption key, or any combination of those Smart cards require a personal identification number (PIN), so they add a second layer (smart card plus PIN in place of a password) that an impersonator would have to obtain to log onto a system Also, smart cards can be configured to lock up after a few unsuccessful attempts to enter a PIN Windows Server 2008 fully supports smart cards and lets them be used to log onto a computer or network or to enable certificate-based authentication for opening documents or performing other tasks Smart cards require a reader attached to the computer through a USB port, a PCMCIA or just PC Card slot, or an ExpressCard slot With a smart-card reader, users do not have to press ctrl-alt-del They only need to insert their card, at which point they are prompted for their PIN With a valid card and PIN, users are authenticated and allowed on the system in the same way as they would be by entering a valid username and password A number of smart-card readers are Plug and Play compliant, and drivers for these devices are either included with Windows Server 2008 or available from the manufacturer Installing them requires little more than plugging them in With a smart-card reader installed, set up new accounts (as previously described) and then, for both new and old accounts, open the user s Properties dialog box by double-clicking a user in the Active Directory Users And Computers window (see Network User Authentication earlier in this chapter for directions on opening this window) In the user s Properties dialog box, click the Account tab and scroll the Account Options list and check Smart Card Is Required For Interactive Logon (if a smart card is not installed or detected by Windows Server 2008, this option may not be visible) NOTE In case you wondered, the PIN is encrypted and placed on the smart card when it is made The PIN is not stored on the computer or in Active Directory Smart cards are particularly valuable for remote entry to a network, and they can be used by a traveling staff member with a laptop, probably using virtual private networking (VPN) over the Internet Smart cards are also frequently used in the issuance of certificates of authenticity for documents and other objects (see the discussion of certificates later in the chapter under Secure Data Transmission ) Biometric Devices Smart cards do provide an added degree of security over passwords, but if someone obtains both the card and the PIN, that person is home free The only way to be totally sure that the computer is talking to the real person is to require some physical identification of the person This is the purpose of biometric devices, which identify people by physical traits, such as their voice, handprint, fingerprint, face, or eyes Often, these devices are used with a smart card to replace the PIN Biometric devices are now moving into the mainstream with some laptops having fingerprint readers built in While there is nothing built into Windows Server 2008 specifically to handle them, drivers and the implementing technology are readily available USB plug-in fingerprint scanners and their software can be purchased for less than $50 Other devices can cost several hundred to several thousand dollars for a face scanner In the next few years, these devices will be everywhere, so, depending on your needs, you may want to keep them in mind.

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Anti-static wrist straps and mats use tiny resistors devices that stop or resist the flow of electricity to prevent antistatic charge from racing through the device These resistors can fail over time, so it s always a good idea to read the documentation that comes with your anti-static tools to see how to test those small resistors properly Any electrical component not in a PC needs to be stored in an anti-static bag , a specially designed bag that sheds whatever static electricity you have when you touch it, thus preventing any damage to components stored within (Figure 29) Almost all PC components come in an anti-static bag when purchased Experienced techs never throw these bags away, as you never know when you ll want to pull a part out and place it on a shelf for a while! Although it would be ideal to have an anti-static wrist strap with you at all times, the reality is that from time to time you ll find yourself in situations where you lack the proper anti-static tools This shouldn t keep you from working on the PC if you re careful! Before working on a PC in such a situation, take a moment to touch the power supply I ll show you where it is in this chapter every once in a while as you work to keep yourself at the same electrical potential as the PC Although this isn t as good as a wrist strap, it s better than nothing at all! The last issue when it comes to preventing ESD is that never-ending question should you work with the PC plugged in or unplugged The answer is simple do you really want to be physically connected to a PC that is plugged into an electrical outlet Granted, the chances of electrocution are slim, but why take the risk Have I convinced you that ESD is a problem Good! So now it s safe to start looking at the components of the PC.

The key to working on PCs without damaging their delicate components is caution In this exercise, you ll prepare for a cautious (and if done properly, harmless) exploration of the system s internal organs

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