How many keys do they have to generate such that every pair


Problem

Suppose, a network consists of four different nodes (A, B, C and D). How many keys do they have to generate such that A, B and C can communicate with D in a bidirectional secure way using the DES algorithm? How many keys do they have to generate such that every pair of nodes can communicate in a bidirectional secure way using the same algorithm? How many keys do they need to generate for both scenarios while using 3DES algorithm?

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Data Structure & Algorithms: How many keys do they have to generate such that every pair
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