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In a network of 20 users, every pair of users must share a separate secret key for symmetric-key communication. How many keys are required…

2356Medium DSSSB TGT Computer Science 0 replies 1 views

In a network of 20 users, every pair of users must share a separate secret key for symmetric-key communication. How many keys are required in total?

Correct answer: D

Explanation

The number of pairs is C(20, 2) = 20 × 19 / 2 = 190.

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