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Exam 210-260 topic 2 question 130 discussion

Actual exam question from Cisco's 210-260
Question #: 130
Topic #: 2
[All 210-260 Questions]

In a brute-force attack, what percentage of the keyspace must an attacker generally search through until he or she finds the key that decrypts the data?

  • A. Roughly 50 percent
  • B. Roughly 66 percent
  • C. Roughly 75 percent
  • D. Roughly 10 percent
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Suggested Answer: A 🗳️
by max80 at Jan. 21, 2020, 9:42 a.m.

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max80
5 years, 5 months ago
"Flash Card Machine". "Question: Why do the statistics measure estimate time to having 50% of the keyspace searched? Answer: Because we don't know where in the keyspace of 72,000,000,000,000,000 the right answer is. On the average, only 50% of the keyspace needs to be searched before a solution is found." https://en.wikipedia.org/wiki/Key_space_(cryptography)
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