If there are N people in the world and are using secret key encryption – McqOptions

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1.	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:
A.	N
B.	N-1
C.	N*(N-1)/2
D.	N*(N+1)/2
Answer» D. N*(N+1)/2

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