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Welcome to the Number Theory and Cryptography MCQs Page

Dive deep into the fascinating world of Number Theory and Cryptography with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Number Theory and Cryptography, a crucial aspect of Discrete Mathematics. In this section, you will encounter a diverse range of MCQs that cover various aspects of Number Theory and Cryptography, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Discrete Mathematics.

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Check out the MCQs below to embark on an enriching journey through Number Theory and Cryptography. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Discrete Mathematics.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Number Theory and Cryptography. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Number Theory and Cryptography MCQs | Page 12 of 13

Explore more Topics under Discrete Mathematics

Q111.
Suppose that there are two primes, p₁ = 229 and pβ‚‚ = 61. Find the value of z and Ξ¦.

a.

13969, 13680

b.

5853, 23452

c.

7793, 34565

d.

17146, 69262

Discuss
Answer: (a).13969, 13680
Q112.
________ can decrypt traffic to make it available to all other network security functions such as web proxies.

a.

SSL visibility appliances

b.

RSA appliances

c.

Rodriguez cipher system

d.

Standard cipher system

Discuss
Answer: (a).SSL visibility appliances
Q113.
The ROT13 caesar cipher system has an offset of ___________

a.

13

b.

45

c.

71

d.

37

Discuss
Answer: (a).13
Q114.
In a public key system, the cipher text received is C = 10 if RSA encryption used with a public key(e = 11, n = 77) to deduce the plain text. Determine the value of Ο•(n)?

a.

49

b.

60

c.

123

d.

70

Discuss
Answer: (b).60
Q115.
To encrypt a message _______ is used on the character’s positions.

a.

boolean algebra

b.

bijective function

c.

inverse function

d.

surjective function

Discuss
Answer: (b).bijective function
Q116.
The public key of given user, in an RSA encryption system is e = 57 and n = 3901. What is the value of Euler’s totient function Ο•(n) for calculating the private key of the user?

a.

4369

b.

3772

c.

871

d.

7892

Discuss
Answer: (b).3772
Q117.
Using RSA algorithm what is the value of cipher test c if the plain text e = 7 and P = 5, q = 16 & n = 832. Determine the Euler’s totient function for the plain text?

a.

47

b.

584

c.

428

d.

60

Discuss
Answer: (d).60
Q118.
There are 67 people in a company where they are using secret key encryption and decryption system for privacy purpose. Determine the number of secret keys required for this purpose?

a.

887

b.

6529

c.

2211

d.

834

Discuss
Answer: (c).2211
Q119.
In a transposition cipher, the plaintext is constructed by the ________ of the ciphertext.

a.

permutation

b.

combination

c.

sequence

d.

series

Discuss
Answer: (a).permutation
Q120.
How many bits of message does the Secure Hash Algorithm produce?

a.

160 bits

b.

1035 bits

c.

621 bits

d.

3761 bits

Discuss
Answer: (a).160 bits
Page 12 of 13

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