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# Introduction to Information Security MCQ

1.Modular arithmetic is primarily concerned with operations involving:
A) Real numbers
B) Complex numbers
C) Integers within a fixed range
D) Rational numbers

Answer: C) Integers within a fixed range
Explanation: Modular arithmetic deals with operations on integers within a fixed range.

2.Which algorithm is commonly used to find the modular multiplicative inverse?
A) RSA algorithm
B) Diffie-Hellman algorithm
C) ElGamal algorithm
D) Extended Euclidean Algorithm

Explanation: The Extended Euclidean Algorithm is commonly used to find the modular multiplicative inverse, which is crucial in many cryptographic algorithms.

3.Discrete logarithms are particularly relevant in:
A) Symmetric cryptography
B) Asymmetric cryptography
C) Hash functions
D) Digital signatures

Explanation: Discrete logarithms play a significant role in asymmetric cryptography, particularly in algorithms like Diffie-Hellman and ElGamal.

4.Which of the following is NOT a fundamental principle of security?
A) Confidentiality
B) Integrity
C) Availability
D) Completeness

Explanation: Completeness is not a fundamental principle of security. The principles are Confidentiality, Integrity, and Availability (CIA).

5.An example of a social engineering attack is:
A) Phishing
B) Distributed Denial of Service (DDoS)
C) SQL Injection
D) Buffer Overflow

Explanation: Phishing is a type of social engineering attack that manipulates individuals into revealing sensitive information.

6.Which mathematical concept is essential for asymmetric encryption?
A) Fermat’s Little Theorem
B) Euler’s Totient Function
C) Modular Arithmetic
D) Discrete Logarithms

Explanation: Discrete logarithms are crucial in asymmetric encryption algorithms like Diffie-Hellman and ElGamal

7.The concept of nonrepudiation is closely related to which security principle?
A) Confidentiality
B) Integrity
C) Availability
D) Authenticity