A computer intrusion detection system (IDS) is designed to provide an alarm when

Question

A computer intrusion detection system (IDS) is designed to provide an alarm whenever an intrusion is being attempted into a computer system. Consider a double IDS with system A and system B. If there is an intruder, system A sounds an alarm with probability 0. 94.94, and system B sounds an alarm with probability 0. 96.96. If there is no intruder, the probability that system A sounds an alarm (i.e., a false alarm) is 0. 21.21 and the probability that system B sounds an alarm is 0. 11.11. (Let "A" be the event that alarm A sounds, "B" be the event that alarm B sounds, and "In" be the event of an intruder.)

Explanation / Answer

Questions are not shown:

b) P(both system sound alarm) = 0.94 * 0.96 = 0.9024

c) P(no intruder and both system make alarm) = 0.21 * 0.11 = 0.0231

d) P(at least one sound alarm) = 1 - P(both doesnot sound alarm)

P = 1 - 0.9024

P = 0.0976

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