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Modern operating systems

Andrew Tanenbaum
ISBN 0-13-031358-0

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The threats discussed in the previous sections were largely caused from the inside, that is, perpetrated by users already logged in. However, for machines connected to the Internet or another network, there is a growing external threat. A networked computer can be attacked from a distant computer over the network. In nearly all cases, such an attack consists of some code being transmitted over the network to the target machine and executed there doing damage. As more and more computers join the Internet, the potential for damage keeps growing. In the following sections we will look at some of the operating systems aspects of these external threats, primarily focusing on viruses, worms, mobile code, and Java applets.

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