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Cryptography and security

Total questions: 35

Worksheet time: 18mins

Name
Class
Date
1.
What is mean by one party cannot deny receiving a message or a transaction nor can the other party deny sending a message or a transaction?
a)
Non-repudiation
b)
Confidentiality
c)
Integrity
2.
What is the formula for Decryption in Caesar Cipher?
a)
p=(c-k) mod 26
b)
c=p+k
c)
c=(p+k) mod 26
3.
What is the full form of AES?
a)
Advanced Encryption Standard
b)
Audio engineering society
c)
Automatic Expert System
4.
What is the process of defeating cryptographic security systems and gaining access to the contents of encrypted message without using cryptographic key?
a)
Cryptanalysis
b)
Brute-Force attack
c)
man-in middle
5.
…............. seeks to make the relationship between the statistics of the ciphertext and the value of the encryption key as complex as possible
a)
Confusion
b)
Diffusion
c)
Permutation
6.
In network security CIA stands for?
a)
Confidentiality, Integrity, Availability
b)
Confidentiality, Integrity, Accountability
c)
Confidentiality, Integrity, Accessability
7.
Examples of asymmetric algorithm?
a)
None of the mentioned
b)
DES
c)
Triple DES
8.
In a(n) …...........cipher, the same key is used by both sender and receiver.
a)
A Symmetric-Key
b)
An Asymmetric-key
c)
Both symmetric and asymmetric
9.
How many rounds DES consist of?
a)
16
b)
10
c)
9
10.
…........... means information is not disclosed to unauthorized individuals, entities and process. 
a)
Confidentiality
b)
Non -Repudiation
c)
Availabilty
11.
An Attack which involves modification of Data is known as _____.
a)
active attack
b)
passive attack
c)
security attack
12.
What is the type of AES Technique?
a)
block
b)
stream
c)
asymmetric
13.
…..... is the process where cryptanalyst/attacker places himself in the communication channel in the middle of the two parties who wish to exchange with each party and original parties believe that they are exchanging keys with each their partner.
a)
Man-in middle attack
b)
Brute-Force attack
c)
Cryptanalysis
14.
A ------ takes place when one entity pretends to be a different entity It includes one of the other forms of active attack.
a)
Masquerade
b)
Replay
c)
Release of message
15.
…....... are symmetric algorithms.
a)
Rail-fence algorithm
b)
Playfair
c)
Both mentioned
16.
ECB and CBC are …...... Ciphers.
a)
Block
b)
Stream
c)
field
17.
…......... uses two instances of DES ciphers for encryption and two instances of reverse ciphers for decryption.
a)
Double DES
b)
Triple DES
c)
DES
18.
…......... provides secrecy during communication by hiding words.
a)
Cryptography
b)
Cryptanalysis
c)
Cryptology
19.
In an Assymetric sender uses ----- keys to send the message
a)
public
b)
private
c)
both public and private
20.
DES is a(n) …....... Method adopted by the US Government
a)
Symmetric-Key
b)
Asymmetric-Key
c)
Both mentioned
21.
_____ means some portion of a legitimate message is altered or that message are delayed .
a)
Modification of message
b)
Replay
c)
masquerade
22.
…............. have Key sizes is 128, 192 or 256 bits.
a)
AES Algorithm
b)
DES Algorithm
c)
Triple DES
23.
A …......... Cipher uses 5 x 5 matrix for arranging alphabates to encrypt.
a)
Playfair
b)
Vernam
c)
Vigenere
24.
Long form of ECB is …...........
a)
Electronic Code Book
b)
Electronic Cipher Book
c)
Electronic Code Block
25.
…....... is the statistical structure of the plaintext is degenerate into long-range statistics of the ciphertext.
a)
Diffusion
b)
Confusion
c)
Permutation
26.
AES contains …...... Rounds for 128 bits.
a)
10
b)
16
c)
12
27.

GCD of (1190, 1445)

a)

85

b)

65

c)

1190

d)

1110

28.

Encrypt the message “SECURITY AWARENESS” using Caesar

Cipher with a shift of 7

a)

ALJBYPAF HDYLULXX

b)

LBJBYPAF HDYLULWW

c)

ZLJBYPAF HDYLULZZ

d)

ALJSYPAF HDYLULMM

29.

Solve 52^17 mod 121 using Modular Exponentiation

a)

13

b)

15

c)

17

d)

26

30.

What is the primary purpose of hash functions in cryptography?

a)

Data compression

b)

Data integrity

c)

Encryption

d)

Decryption

31.

Which of the following is a common property of cryptographic hash functions?

a)

  • Reversibility

b)

  • Determinism

c)

  • Collisions

d)

  • All of the above

32.

Which of the following is a cryptographic hash function algorithm?

a)

MD5

b)

SHA-1

c)

SHA-256

d)

All of the above

33.

Why is MD5 considered weak for cryptographic purposes?

a)

It produces too long a hash

b)

It can easily produce collisions

c)

It is not widely implemented

d)

It is very slow

34.

What is asymmetric cryptography based on?

a)

  • A. Single Key

b)

  • Two Keys

c)

  • . Mathematical Functions

d)

  • Random Numbers

35.

In which cryptographic algorithm is the ShiftRows transformation used?

a)

RSA

b)

AES

c)

DES

d)

Hash

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