barcodelib c# 1: Security Quick-Start in Objective-C

Making Data Matrix ECC200 in Objective-C 1: Security Quick-Start

CHAPTER 1: Security Quick-Start
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select Disable remote control infrared receiver. If infrared is enabled, then you can pair your remote with your machine, which keeps any old remote control from invoking applications on your computer. If at a later date you choose to unpair the remote (because you have a new remote or lost your old one), simply click on the Unpair button in this window (Pair turns into Unpair when the remote is paired with the machine). It s also worth noting that once a remote has been paired with a Mac, no other remote can operate in this function, which can help minimize the drive-by effect.
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FileVault
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Let s face it: we re human, and with the number of passwords we have to remember on a day-to-day basis, we can very easily forget them. But what happens when you forget your computer s password and you are the only one with an account on the machine There is a system that websites use when users forget their passwords. It s called a selfservice password reset and can be used to reset a password on its own (usually by answering a secret question on a web prompt and then receiving a new temporary password via e-mail). For a machine with many users, this would certainly be a handy feature to have, and would significantly reduce the volume of calls to the help desk. Luckily, Apple supplied Mac owners with this feature via the password reset utility included on the Mac OS X CD. By booting a computer to the CD (holding down the C key at boot), you can reset the password. A very handy feature indeed. But what if your computer fell into the wrong hands, and you wanted to limit someone s ability to access your data if they were able to reset the password Many of us travel with laptops that, if stolen and their passwords reset, would give users access to data they shouldn t be able to access. If a teacher s computer were rebooted by a student, they d have access to tests, children would have access to their parents website viewing habits, employees would have access to confidential data about other employees, and so on all if they were able to get physical access to our computers while we were away. The ability to easily reset a password introduces you to a feature of the Mac OS X security preferences that protects data, even if the password is reset using the CD: FileVault. FileVault removes the ability to access data in a user s folder, even if the password is reset, by encrypting the contents of a user s home folder into a secured disk image. NOTE: The FileVault feature is only as strong as the password protecting the home folder. FileVault is not for everyone. It can certainly cause some inconveniences. By enabling FileVault, Windows file sharing and printer sharing are disabled, and when sharing files through Apple file sharing (AFP), users won t be able to access files you re sharing from your home folder until it is unlocked. By enabling FileVault, you will break these connections if another user is relying on them, and they will not be able to access resources in the future, so be cautious. It can also slow down the logout process, because it encrypts the data in the home folder during the logout process. FileVault can also have complications with certain applications, such as Adobe Illustrator. If you
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CHAPTER 1: Security Quick-Start
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suspect that FileVault is causing an application to be problematic, then turn it off to see whether that fixes the issue. Even with these inconveniences, FileVault is an excellent way to secure the data on your machine. To use FileVault, you will need to set it up in the Security preference pane. Open System Preferences, and click Security. Then click the FileVault tab to see a screen similar to Figure 1 7. Next, click Turn On FileVault. At this point, you will need to give the system a master password. The master password can unlock any FileVault on a computer, so it needs to be a strong one. To enable the master password, click the Set Master Password button and type the password you want to use, twice. Then, enter a hint to help you if you forget it at a later date (do not enter the password itself!), as shown in Figure 1 8.
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