In symmetric cryptography, how many keys would be needed if there were 500 participating users?
A.
124,750
B.
249,500
C.
250
D.
250,000
Explanation:
The formula for calculating how many symmetric keys are needed is:
n(n-1)/2.
So, in this example: 500(500-1)/2 = 124,750.
A. 124,750. THe formula is (n*(n-1)/2, where n = number of people
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