Q70

MCQ2 marks, −0.5

The total number of keys required for a set of $n$ individuals to be able to communicate with each other using secret key and public key cryptosystems, respectively are:

(A)

$n(n-1)$ and $2n$

(B)

$2n$ and $\dfrac{n(n - 1)}{2}$

(C)

$\dfrac{n(n - 1)}{2}$ and $2n$

(D)

$\dfrac{n(n - 1)}{2}$ and $n$

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