The one thing
computers do best is also the most dangerous thing about
them??”they collect, store, and display information. Your job as
a system administrator is to ensure to the best of your ability
that particular bits of information are displayed only to the
people and machines to which you want those bits displayed.
With its permission-based file system, Unix and Linux make
a good start on protecting your data from the bad guys.
However, the more connections your computer makes to
other computers??”first to a local area network, then to a
wide area network, and finally to the Internet??”the more
chances your data have to be compromised.
In today??™s world of interconnected computers and ???alwayson???
access to the Internet, the importance of maintaining a
secure computer has never been greater. There may be some
truly dangerous cyber-terrorists out there working at bringing
down society as we know it, but these are not the people
from which you have to protect your machine on a regular
basis. The ordinary computer user has to put up with the
script kiddies (young folks who want to prove their alleged
computer prowess by running prewritten programs that break
into other people??™s systems), disgruntled employees, and fastspreading
viruses and worms.
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