c# barcode scanner tutorial Authentication in Software

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Security starts with properly implemented authentication , which means in essence, how the computer determines who can or should access it And, once accessed, what that user can do A computer can authenticate users through software or hardware, or a combination of both Software Authentication: Proper Passwords It s still rather shocking to me to power up a friend s computer and go straight to his or her desktop; or with my married-with-kids friends, to click one of the parent s user account icons and not get prompted for a password This is just wrong! I m always tempted to assign passwords right then and there and not tell them the passwords, of course so they ll see the error of their ways when they try to log in next I don t do it, but always try to explain gently the importance of good passwords You know about passwords from 13, Maintaining Cross Check Windows, so I won t belabor the Proper Passwords point here Suffice it to say that you So, what goes into making a good password Based on what you need to make certain that all your learned in 13, see if you can answer these questions What sorts users have proper passwords of characters should make up a password Should you ask for a user s Don t let them write passwords password when working on his or her PC Why or why not If you re in down or tape them to the undera secure environment and know you ll have to reboot several times, is it side of their mouse pads either! okay to ask for a password then What should you do It s not just access to Windows that you need to think about If you have computers running in a public location, there s always the temptation for people to hack the system and do mean things, like change CMOS settings to render the computer inoperable to the casual user until a tech can undo the damage All modern CMOS setup utilities come with an access password protection scheme (Figure 196) Hardware Authentication Smart cards and biometric devices enable modern systems to authenticate users with more authority than mere passwords Smart cards are credit card sized cards with circuitry that can be used to identify the bearer of the card Smart cards are relatively common for tasks such as authenticating users for mass transit systems, for example, but fairly
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Figure 196
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19: Computer Security
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uncommon in computers Figure 197 shows a smart card and keyboard combination People can guess or discover passwords, but it s a lot harder to forge someone s fingerprints The keyboard in Figure 198 authenticates users on a local machine using fingerprints Other devices that will do the trick are key fobs, retinal scanners, and PC cards for laptop computers Devices that require some sort of physical, flesh-and-blood authentication are called biometric devices Clever manufacturers have developed key fobs and smart cards that use radio frequency identification (RFID) to transmit authentication information, so users don t have to insert Figure 197 Keyboard-mounted smart card reader being used for a something into a computer or card reader The commercial application (photo courtesy of Cherry Corp) Prevarius plusID combines, for example, a biometric fingerprint fob with an RFID tag that makes security as easy as opening a gaFull disclosure time rage door remotely! Figure 199 shows a plusID device
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Microsoft does not claim that the keyboard in Figure 198 offers any security at all In fact, the documentation specifically claims that the fingerprint reader is an accessibility tool, not a security device Because it enables a person to log onto a local machine, though, I think it falls into the category of authentication devices
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The file system on a hard drive matters a lot when it comes to security On a Windows machine with multiple users, you simply must use NTFS, or you have no security at all Not just primary drives, but any secondary drives in computers in your care should be formatted as NTFS, with the exception of removable drives, such as the one you use to back up your system When you run into a multiple-drive system that has a second or third drive formatted as FAT32, you can use the CONVERT command-line utility to go from FAT to NTFS The syntax is pretty straightforward To convert a D: drive from FAT or FAT32 to NTFS, for example, you d type the following:
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