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Something you have Something you are (something unique about you) The most common authentication mechanism is to provide something that only you, the valid user, should know The most frequently used example of this is the common user ID (or username) and password In theory, since you are not supposed to share your password with anybody else, only you should know your password, and thus by providing it you are proving to the system that you are who you claim to be In theory, this should be a fairly decent method to provide authentication Unfortunately, for a variety of reasons, such as the fact that people have a tendency to choose very poor and easily guessed passwords, this technique is not as reliable as it should be Other authentication mechanisms are consequently always being developed and deployed Another method to provide authentication involves the use of something that only valid users should have in their possession A physical-world example of this would be a simple lock and key Only those individuals with the correct key will be able to open the lock and thus provide admittance to a house, car, office, or whatever the lock was protecting A similar method can be used to authenticate users for a computer system or network (though the key may be electronic and may reside on a smart card or similar device) The problem with this technology is that people will lose their keys (or cards), which means they can t log in to the system and somebody else who finds the key can then access the system, even though that person is not authorized To address this problem, a combination of the something-you-know/something-you-have methods is often used so that the individual with the key can also be required to provide a password or passcode The key is useless unless you know this code An example of this is the ATM card most of us carry The card is associated with a personal identification number (PIN), which only you should know Knowing the PIN without having the card is useless, just as having the card without knowing the PIN will not give you access to your account The third general method to provide authentication involves something that is unique about you We are used to this concept in our physical world, where people s fingerprints or a sample of their DNA can be used to identify them This same concept can be used to provide authentication in the computer world The field of authentication that uses something about you or something that you are is known as biometrics A number of different mechanisms can be used to accomplish this type of authentication, such as a voice or fingerprint, a retinal scan, or hand geometry All of these methods obviously require some additional hardware in order to operate While these three approaches to authentication appear to be easy to understand and in most cases easy to implement, authentication is not to be taken lightly, since it is such an important component of security Potential attackers are constantly searching for ways to get past the system s authentication mechanism, and some fairly ingenious methods have been employed to do so Consequently, security professionals are constantly devising new methods, building on these three basic approaches, to provide authentication mechanisms for computer systems and networks A more in-depth discussion of various authentication schemes is covered in 9.

Jill and Terry run A-Z Pet Kare in New Des Moines, Ohio The company provides pet grooming services and offers an entire inventory of pet care products They lease space in a storefront plaza totaling 2360 square feet The plaza is shown in Figure A-1 In order to better track their work, Terry has decided to implement a wireless network The new network will allow him to carry a Pocket PC with him as he moves from area to area with customers This Pocket PC will run an application allowing him to check pricing and inventory as well as update the inventory from any location It is a simple application requiring manual input from the user for all inventory management Jill has indicated that Internet connectivity is important and that they already have a DSL router providing approximately 2 Mbps of bandwidth She says this is plenty of bandwidth, but she wants to be able to connect from her laptop so that she can update the A-Z Pet Kare Web sites with information about customer pets regardless of her current location in the facility While the space is small, the facility is separated into three rooms: a main entry room, the pet grooming room, and a pet boarding room while the pets await their owners return Jill states that all of this space must be covered

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FIGURE A-1

cost you an arm and a leg to do it And my feeling is that the artist really needs to be free to not have to think about how he s going to accomplish something, or if he can afford to accomplish something He should just be able to let his imagination run wild without a lot of constraints And that s really what digital is allowing us to do

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