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Question 36Asked in UGC NET Computer Science, June 2016 (Paper II & III, Selected Questions)

If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be: (b) (N – 1)

  1. AN
  2. B(N – 1)
  3. CN(N – 1)/2
  4. DN(N + 1)/2
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Correct answer: (C) N(N – 1)/2

Explanation

Each pair of users must have a separate secret key. If N people want to use this method, the number of secret keys needed is ᴺC₂ = N(N – 1)/2.

From UGC NET Computer Science PYQ, June 2016 (Paper II & III, Selected Questions)

This is question 36 of UGC NET Computer Science PYQ, June 2016 (Paper II & III, Selected Questions). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.