Explore topic-wise MCQs in Cryptography and Network Security.

This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Cryptography and Network Security knowledge and support exam preparation. Choose a topic below to get started.

1.

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
Answer» B. L
Discussion
2.

In Elgamal cryptosystem, given the prime p=31.Encrypt the message “HELLO”; use 00 to 25 for encoding. The value of C2 for character ‘O’ is

A. 09
B. 07
C. 23
D. 27
Answer» B. 07
Discussion
3.

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

A. 12
B. 07
C. 20
D. 27
Answer» E.
Discussion
4.

In Elgamal cryptosystem, given the prime p=31.Choose e1= first primitive root of p and d=10, calculate e2.

A. 24
B. 36
C. 25
D. 62
Answer» D. 62
Discussion
5.

Which Cryptographic system uses C1 = (e1r) mod p and C1 = (e2r x P) mod p at the encryption side?

A. Elgamal
B. RSA
C. Rabin
D. Whirlpool
Answer» B. RSA
Discussion
6.

Using Rabin cryptosystem with p=23 and q=7Encrypt P=24 to find ciphertext. The Cipher text is

A. 42
B. 93
C. 74
D. 12
Answer» C. 74
Discussion
7.

“Rabin Cryptosystem is a variant of the Elgamal Cryptosystem”

A. True
B. False
Answer» C.
Discussion
8.

In Elgamal cryptosystem, given the prime p=31.

A.
B. 24
C. 36
Answer» D.
Discussion
9.

Sender chooses p = 107, e1 = 2, d = 67, and the random integer is r=45. Find the plaintext to be transmitted if the ciphertext is (28,9).

A. 45
B. 76
C. 66
D. 13
Answer» D. 13
Discussion
10.

Which Cryptographic system uses C1 = (e1r) mod p and C1 = (e2r x P) mod p at the encryption side?

A. Elgamal
B. RSA
C. Rabin
D. Whirlpool
Answer» B. RSA
Discussion
11.

Using Rabin cryptosystem with p=23 and q=7

A.
B. 42
C. 93
Answer» C. 93
Discussion
12.

“Rabin Cryptosystem is a variant of the Elgamal Cryptosystem”

A. True
B. False
Answer» C.
Discussion