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use a symmetric key, for example, you transfer it to the computer, which uses it to encrypt or decrypt data. To transfer the key between card and computer, though, you need a smart card reader. Several PC manufacturers have announced that future laptops and keyboards will come with built-in smart card readers. The International Organization for Standardization (ISO) has published several standards outlining the physical characteristics of smart cards, including the dimensions and locations of the contacts, signals and transmission, and more. Virtually all smart cards look alike because they are built to standard. The idea is that all smart cards will be usable with a wide variety of readers. So far, however, many smart cards and readers simply don t work together. Often, to use a particular manufacturer s smart card, you must use that firm s reader. As more PC manufacturers release products with readers built in, this situation should change.
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The Universal Serial Bus port is an industry standard for attaching plug and play devices. Other ports have such functionality (such as PCMCIA), but the USB port is probably the most popular. Since 1998 or 1999, most new PCs and laptops have come with USB ports as standard equipment. If you have a device that connects to your computer through the USB port (such as a camera downloading pictures or a printer), there s no need to attach and reboot. So long as the software to run the device is installed, you simply insert the device and run it. When you re done with one USB device, take it out and insert a new one, or most likely, you can have several attached to the same port. Several companies have introduced cryptographic tokens that attach to the USB port. Other companies with tokens that are not USB-ready have made adapters to USB ports. These tokens are approximately 21/2 by 1 /2 inches in size (about the size of a house key but a little thicker). They have quite a bit more computing power and storage space than smart cards. Hence, they will almost always be much faster, do more work, and store more keys than a smart card.
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In addition to your keys, tokens can hold passwords. Suppose you have several places to log in: your network account, e-mail, various computer accounts, electronic commerce accounts (such as an account with an
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online travel agent or bookstore), and so on. For each account, you d like a different password. In that way, if someone figures out one password (for example, the online travel agent might know your password for that account), he or she won t have them all. The solution is to use a token to generate big random passwords and store those passwords. When you need to log in to an account, you hook up the token and have it send the password. You don t have to remember the password, so it can be random and very long, perhaps 20 or 30 characters. You probably have access to the token through a password, so if attackers obtain your token and figure out that password, they ve got all your passwords. That is a danger, but using a token does help thwart a remote attack. For example, suppose Ray, the attacker, goes to your online bank account and logs in as you. Although he need not be at your computer to do this he can be in Elbonia he does need to enter your password. A long, random password is much more difficult to crack than passwords you might otherwise use for your various accounts because they re easier to remember.
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