Data Communication and Computer Networks - Computer Network

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61. Suppose that (G, +) and (H, .) are abelian groups. A pairing is a ______ mapping e: G x G → that e(ag₁, bg₂) = ________ for all g₁, g₂ ∈ G and for all integers a, b.

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Option : D
Explanation :

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62. Input block size of SHA-1 is

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Option : A
Explanation :

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63. Let P, C, K denote plaintext space, ciphertext space and key space respectively. In Shift Cipher P = C = K = Z₂₆. For 0 ≤ k ≤ 25 encryption function e_k is defined by e_k(x) = ______ mod 26 and decrypt fuction d_k is defined by d_k(x) = ____ mod 26.

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Option : A
Explanation :

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64. In Caesar Cipher encryption function e_k is defined by e_k(x) = ______ mod 26

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Option : C
Explanation :

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65. What is the ciphertext for the plaintext "CRYPTOGRAPHY" using Caesar Cipher?

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Option : D
Explanation :

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