Information and Network Security MCQs with answers Page - 11

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Q. The S-Box is used to provide confusion, as it is dependent on the unknown key.

  • (A) True
  • (B) False
  • (C) none
  • (D) all

A

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Q. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where PT message=88 and thus find the CT.

  • (A) 64
  • (B) 11
  • (C) 54
  • (D) 23

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Q. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.

  • (A) 122
  • (B) 143
  • (C) 111
  • (D) 88

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Q. In an RSA system the public key of a given user is e = 31, n = 3599. What is the private key of this user?

  • (A) 1023
  • (B) 2432
  • (C) 2412
  • (D) 3031

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Q. Compute private key (d, p, q) given public key (e=23, n=233 ´ 241=56,153).

  • (A) 32432
  • (B) 19367
  • (C) 12543
  • (D) 35212

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Q. RSA is also a stream cipher like Merkel-Hellman.

  • (A) True
  • (B) False
  • (C) none
  • (D) all

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Q. In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?

  • (A) p/q should give no remainder
  • (B) p and q should be prime
  • (C) p and q should be co-prime
  • (D) p and q should be divisible by Ф(n)

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Q. In RSA, Ф(n) = _______ in terms of p and q.

  • (A) (p+1)(q+1)
  • (B) (p-1)(q-1)
  • (C) (p)(q)
  • (D) (p)/(q)

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Q. Which of the following is a natural candidates for stream ciphers?

  • (A) OFB
  • (B) ECB
  • (C) CBC
  • (D) CFB

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