Which of the following is the size of a sub key in AES algorithms?

a.

32 bits

b.

192 bytes

c.

128 bits

d.

64 bits

The art and science of recovering the plaintext from the encrypted message is ____________________________

a.

Cryptanalysis

b.

Cryptology

c.

Steganography

d.

Cryptography

_______________ cipher requires a new key of the same length as the each new message.

a.

Vigenre

b.

OTP

c.

Monoalphatic

d.

Playfair

Question text

Ahmed and Aziz likes to have communication in secure way and keep their identity in every message communication so decide to use digital signature. Ahmed like to send message and perform encryption with his ________________ key.

a.

Public

b.

Single

c.

Private

d.

Random

Question text

Which of the following algorithm is not used for key exchange?

a.

Elliptic Curve

b.

RSA

c.

DSS

d.

Diffie Hellman

Cryptanalyst in ROP of Oman, recover a text file hidden "inside" an image or a sound file. This technique is know is ____________________________

a.

Cryptanalytic attack

b.

Cryptography

c.

Steganography

d.

Brute-force attack

_______________ number of bit(s) are shifted(Circular Shift) in round number 9 in DES algorithm.

a.

3

b.

2

c.

4

d.

1

Which of the following algorithm is NOT used for digital signature?

a.

RSA

b.

Elliptic Curve

c.

Diffie Hellman

d.

DSS

Question text

In hybrid cryptosystem, the data encapsulation scheme is based on ______________________ cryptosystem.

a.

RSA

b.

DSS

c.

DES

d.

Elliptic Curve

Question text

____________ciphers replace each letter with a different letter or symbol to produce the ciphertext.

a.

DES

b.

AES

c.

Rail-Fence

d.

Monoalphabetic