Question

10 parties want to exchange messages securely using some symmetric key encryption technique like AES. The number of distinct key values required will be __________

Answer 1

Answer:

45

Explanation:

For symmetric keys or private key cryptographic techniques, the number of distinct key values can be calculated using the formula

(n(n-1)) /2  or nC2

where n -> no. of different parties involved

Therefore, for 10 parties it would be:

(10(10-1)) / 2 = (10*9)/2 = 90/2 = 45 (Ans)