# Welcome to the Cryptography Basics MCQs Page

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

Check out the MCQs below to embark on an enriching journey through Cryptography Basics. 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 Cryptography Basics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

### Cryptography Basics MCQs | Page 1 of 11

Q1.
Bob selects E67(2, 3) as the elliptic curve over GF(p). He selects e1 = (2, 22) and d = 4.
Q2.
Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = <Zn∗, ×>?
Q3.
Find the solution of x^2≡3 mod 23
Q4.
In Elgamal cryptosystem, given the prime p=31.
Encrypt the message “HELLO”; use 00 to 25 for encoding. The value of C2 for character ‘L’ is
Q5.
In Elgamal cryptosystem, given the prime p=31.
What is the respective plaintext character for C = (27, 20)?

a.

H

b.

L

c.

O

d.

M

Q6.
The multiplicative Inverse of 550 mod 1769 is –
Q7.
It is desirable to revoke a certificate before it expires because –
Q8.
Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B’s public key. In notation of X.509, the correct order of this chain is represented as –
Q9.
A total of seven messages are required in the Public-Key distribution scenario. However, the initial five messages need to be used only infrequently because both A and B can save the other’s public key for future – a technique known as ____________
Q10.
Which of the following statements are true?

i) In the CBC mode, the plaintext block is XORed with previous ciphertext block before encryption.
ii) The CTR mode does not require an Initialization Vector
iii) The last block in the CBC mode uses an Initialization Vector
iv) In CBC mode repetitions in plaintext do not show up in ciphertext