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46. Which of the following is not a part of round 10 in AES-128?

SubBytes

ShiftRows

MixColumns

AddRoundKey

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47. Let g be a primitive root of the finite field F_{p} and y, z be a non-zero element of F_{p} and x ∈ F_{p}. Discrete Logarithm Problem (DLP) is to find _____

x such that g^{x} ≡ y(mod p)

y such that g^{x} ≡ y(mod p)

z such that g^{x} ≡ yz(mod p)

(x, y) such that g^{x} ≡ y(mod p)

48. Suppose Alice and Bob use the Diffie-Hellman Key exchange technique with a common prime p = 23 and a primitive root g = 7. If Alice chooses the secret key a = 3 and Bob chooses the secret key b = 6, then the common secret key shared between Alice and Bob is ____

18

13

15

17

49. The number of primitive roots in the group G = (Z_{17}^{*}, X) is ______

8

10

12

6

50. If 4 ≡ 3^{x}(mod 7), then the value of x is _______

3

1

2

4

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