Explore topic-wise MCQs in Cryptography Interview.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Cryptography Interview knowledge and support exam preparation. Choose a topic below to get started.

1.

Which systems use a timestamp?i) Public-Key Certificatesii) Public announcementsiii) Publicly available directoriesiv) Public-Key authority

A. i) and ii)
B. iii) and iv)
C. i) and iv)
D. iv) onlyView Answer
Answer» D. iv) onlyView Answer
Discussion
2.

“Meet in the middle attack” is an attack

A. where the timing required for the attack via brute force is drastically reduced
B. where the adversary uses 2 or more machines to decrypt thus trying to reduce the time
C. where messages are intercepted and then either relayed or substituted with another message
D. where cryptanalysis takes lesser time than the brute force decryption
Answer» D. where cryptanalysis takes lesser time than the brute force decryption
Discussion
3.

Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = ?a) 17b) 20c) 38d) 50 10.Find the solution of x2≡3 mod 23

A. 17b) 20c) 38d) 50 10.Find the solution of x2≡3 mod 23a) x≡±16 mod 23
B. 20c) 38d) 50 10.Find the solution of x2≡3 mod 23a) x≡±16 mod 23b) x≡±13 mod 23
C. 38d) 50 10.Find the solution of x2≡3 mod 23a) x≡±16 mod 23b) x≡±13 mod 23c) x≡±22 mod 23
D. 50 10.Find the solution of x2≡3 mod 23a) x≡±16 mod 23b) x≡±13 mod 23c) x≡±22 mod 23d) x≡±7 mod 23View Answer
Answer» C. 38d) 50 10.Find the solution of x2≡3 mod 23a) x≡±16 mod 23b) x≡±13 mod 23c) x≡±22 mod 23
Discussion
4.

Find the order of group G=

A. 6
B. 4
C. 3
D. 5
Answer» B. 4
Discussion
5.

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

A. TIN
B. INT
C. KIN
D. INK
Answer» C. KIN
Discussion
6.

For the point P (7, 0) defined in the curve E13(1, 1). What is –P?

A. (7,1)
B. (8,12)
C. (8,1)
D. (7,0)
Answer» E.
Discussion
7.

Bob selects E67(2, 3) as the elliptic curve over GF(p). He selects e1 = (2, 22) and d = 4.Then he calculates e2 = d × e1 and the publicly announces the tuple (E, e1, e2). Now, Alice wants to send the plaintext P = (24, 26) to Bob and she selects r = 2. What are C1 and C2?

A. C1=(35,1) ; C2 =(21,44)
B. C1=(44,21) ; C2 =(1,35)
C. C1=(44,21) ; C2 =(44,21)
D. C1=(21,44); C2 =(35,1)
Answer» B. C1=(44,21) ; C2 =(1,35)
Discussion