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19: Computer Security
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The best way to prevent damage from a virus is to keep from getting a virus in the first place Use your passive antivirus shield, scan the PC daily, know where software has come from before you load it, and keep your antivirus definitions updated Don t view e-mail messages in a preview pane, and only download files from sites you know to be safe Unsolicited e-mail is called spam Never post your e-mail address on the Internet, as over 97 percent of spam comes from e-mail addresses posted online Spam filters can block spam at the mail server or at your computer You can set most e-mail programs to block e-mail sent from specific people or to a specific person Irritating Web browser problems include pop-ups, spyware, and adware Many pop-ups remove the navigation aids from the browser window or mimic Windows dialog boxes To safely close a pop-up, right-click the pop-up s Taskbar icon and choose Close, or press ALT-TAB until the pop-up window is active, and then press ALT-F4 to close it Spyware can use your computer s resources to run distributed computing applications, capture keystrokes to steal passwords, or worse Spyware typically disguises itself as useful utilities, so be vigilant about what you install Some spyware can be removed via Add/Remove Programs, but for stubborn spyware use a third-party tool such as Lavasoft s Ad-Aware or PepiMK s Spybot Search & Destroy Grayware leaches network bandwidth, although some consider the programs beneficial Peer-topeer file-sharing programs that enable a lot of users to upload portions of files on demand might seem useful to someone, but these programs can eat up a significant portion of the network bandwidth, causing other users or programs to respond slowly to network or Internet applications Hardware firewalls protect networks by hiding IP addresses and blocking TCP/IP ports Windows XP comes with a built-in software firewall that is accessible from the Control Panel Security Center applet
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Encryption makes network packets unreadable by hackers who intercept network traffic You are especially vulnerable when using the Internet over a public network Modern operating systems use Kerberos to encrypt authentication credentials over a local network PAP sends passwords in clear text, so it is not very safe CHAP is the most common remote access protocol, in which the serving system challenges the remote system with a secret, like a password MS-CHAP is Microsoft s version of CHAP and uses a more advanced encryption protocol Network data can be encrypted similar to authentication credentials Microsoft s encryption method of choice is called IPSec Netscape s Secure Sockets Layer (SSL) creates secure Web sites Microsoft s HTTPS protocol incorporates SSL into HTTP Web sites whose URL begins with HTTPS:// are used to encrypt credit card purchases To secure a wireless network, use wireless encryption and disable DHCP Require wireless clients to use a static IP address or allot only enough DHCP addresses to meet the needs of your network Definitely change the default administrator user name and password on the WAP Use Event Viewer to track activity on your system Event Viewer offers three sections: Application, Security, and System The Security section doesn t show you everything by default, so it is good practice to enable event auditing and object auditing Event auditing creates an entry in the Security Log when certain events happen, like a user logging on Object Auditing creates entries in response to object access, like someone trying to access a certain file or folder Incidence reporting means telling your supervisor about the data you ve gathered regarding a computer or network problem This provides a record of what you ve done and accomplished It also provides information that, when combined with other information you may or may not know, may reveal a pattern or bigger problem to someone higher up the chain
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