How many keys are needed for encrypted communication among 16 persons using…
2025
How many keys are needed for encrypted communication among 16 persons using AES encryption assuming unique key is used between any two persons:
Answer: A. 120 keys — To find the number of keys needed for encrypted communication among 16 persons using symmetric encryption (AES), we calculate the number of unique pairs. Each…
- A.
120 keys
- B.
256 keys
- C.
53 keys
- D.
216 keys
Attempted by 12 students.
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Correct answer: A
To find the number of keys needed for encrypted communication among 16 persons using symmetric encryption (AES), we calculate the number of unique pairs. Each pair requires a distinct shared key. Using the combination formula n(n-1)/2 where n=16: (16 * 15) / 2 = 120. Therefore, 120 unique keys are needed.
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