A Web application and its support environment has not been fully fortified…
2019
A Web application and its support environment has not been fully fortified against attack. Web engineers estimate that the likelihood of repelling an attack is only 30 percent. The application does not contain sensitive or controversial information, so the threat probability is 25 percent. What is the integrity of the web application?
- A.
0.625
- B.
0.725
- C.
0.775
- D.
0.825
Attempted by 78 students.
Show answer & explanation
Correct answer: D
Answer: 0.825
Reason: Integrity is the probability the application’s integrity is preserved. That equals the probability there is no attack plus the probability there is an attack that is repelled.
Probability of no attack = 1 − threat probability = 1 − 0.25 = 0.75.
Probability an attack occurs and is repelled = threat probability × repelling probability = 0.25 × 0.30 = 0.075.
Integrity = 0.75 + 0.075 = 0.825 (82.5%).
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