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Welcome to the Public Key Cryptography and RSA MCQs Page

Dive deep into the fascinating world of Public Key Cryptography and RSA with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Public Key Cryptography and RSA, a crucial aspect of Cryptography and Network Security. In this section, you will encounter a diverse range of MCQs that cover various aspects of Public Key Cryptography and RSA, 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 Cryptography and Network Security.

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Check out the MCQs below to embark on an enriching journey through Public Key Cryptography and RSA. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Cryptography and Network Security.

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

Public Key Cryptography and RSA MCQs | Page 3 of 4

Q21.
In an RSA system the public key of a given user is e = 31, n = 3599. What is the private key of this user?
Discuss
Answer: (a).3031
Q22.
Compute private key (d, p, q) given public key (e=23, n=233 ´ 241=56,153).
Discuss
Answer: (c).19367
Q23.
Find the ciphertext for the message {100110101011011} using superincreasing sequence { 1, 3, 5, 11, 35 } and private keys a = 5 and m=37.
Discuss
Answer: (c).C = ( 47, 33, 65 )
Q24.
Suppose that plaintext message units are single letters in the usual 26-letter alphabet with A-Z corresponding to 0-25. You receive the sequence of ciphertext message units 14, 25, 89. The public key is the sequence {57, 14, 3, 24, 8} and the secret key is b = 23, m = 61.
Decipher the message. The Plain text is
Discuss
Answer: (b).INT
Q25.
RSA is also a stream cipher like Merkel-Hellman.
Discuss
Answer: (a).True
Q26.
In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?
Discuss
Answer: (c).p and q should be prime
Q27.
In RSA, Ф(n) = _______ in terms of p and q.
Discuss
Answer: (c).(p-1)(q-1)
Q28.
In RSA, we select a value ‘e’ such that it lies between 0 and Ф(n) and it is relatively prime to Ф(n).
Discuss
Answer: (b).False
Q29.
For p = 11 and q = 19 and choose e=17. Apply RSA algorithm where message=5 and find the cipher text.
Discuss
Answer: (a).C=80
Q30.
For p = 11 and q = 19 and choose d=17. Apply RSA algorithm where Cipher message=80 and thus find the plain text.
Discuss
Answer: (c).5
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