Question

For a network with N nodes, how many master keys are present?

(a) N(N-1)/2

(b) N

(c) N(N+1)/2

(d) N/2

This question was addressed to me in a national level competition.

My doubt is from Symmetric Key Distribution topic in section Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

Answer 1

The correct choice is (b) N

For explanation: Each node has a master key to receive the session keys from the Key Distribution Centre (KDC).