From a large set of prime numbers Jimmy choose 23 and 17 as P and Q respectively and a random integer to be 13. Jimmy wants to sends a plain text to M = 127. What will be the value of cipher text using RSA?
(A) 60
(B) 65
(C) 213
(D) 231


Answer: (C)

Explanation: P = 23; Q = 17; e = 13 and M = 127
N = P * Q = 23 * 17 = 391
Φ = (P – 1)*(Q – 1) = 22 * 16 = 352
Cipher text = M^e MOD N
= 127¹³ MOD 391
= 213

So, option (C) is correct.

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