Computer Network Security

A botnet consists of a number of compromised machines that are all controlled by an evil botmaster [39, 146].

a. Most botnets are controlled using the Internet Relay Chat (IRC) protocol. What is IRC and why is it particularly useful for controlling a botnet?

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b. Why might a covert channel be useful for controlling a botnet?

c. Design a covert channel that could provide a reasonable means for a botmaster to control a botnet.

Ross Anderson claims that “Some kinds of security mechanisms may be worse than useless if they can be compromised” [14].

a. Does this statement hold true for inference control? Why or why not?

b. Does this hold true for encryption? Why or why not?

c. Does this hold true for methods that are used to reduce the capacity of covert channels? Why or why not?

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