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COMP2420/COMP6420 - 2020 Sample - Q1 Security

COMP2420/COMP6420 - 2020 Sample - Q1 Security

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Question 1: Security [20 Marks]

a) Multiple Choice [10 Marks]

1) A traffic analysis attack is an attack on:[2 marks] CourseNana.COM

a. Availability
b. Confidentiality
c. Integrity
d. Authenticity

2) Which of these is true about a Hash Function?[2 marks] CourseNana.COM

a. A hash function is two-way
b. A hash function is collision resistant
c. A standard hash function of 256-bits is not collision resistant
d. The output of a hash function is called a detect

3) What block size is used in Advanced Encryption Standard (AES)?[2 marks] CourseNana.COM

a. 128-bits
b. 64-bits
c. 192-bits
d. 256-bits

4) Which of these properties does not always hold in Symmetric Key Cryptography[2 marks] CourseNana.COM

a. c = Ek(m)
b. m = Dk(c)
c. m = Dk(Ek(m))
d. m = Ek(Dk(m))

5) When PGP is used in confidentiality only mode, which of the following algorithms are used?[2 marks] CourseNana.COM

a. Symmetric key algorithm only
b. Asymmetric key algorithm only
c. Hash function only
d. Both symmetric and asymmetric key algorithms
e. Symmetric and asymmetric key algorithms, and a hash function

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