Operating system mcqs security cryptography

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Operating system mcqs security cryptography

Question 1 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is cipher-block chaining?
A
Data is logically 'ANDed' with previous block
B
Data is logically 'ORed' with previous block
C
Data is logically 'XORed' with previous block
D
None of the mentioned
Question 2 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the preferred way of encryption?
A
pre shared secret key
B
using key distribution center (KDC)
C
public key-encryption
D
symmetric key
Question 2 Explanation: 
Pre Shared key can be compromised and either party can be suspected. Likewise KDC or symmetric key can have breach which are undesirable. Public and private key encryption is a known industry standard.
Question 3 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is not an encryption standard?
A
AES
B
TES
C
Triple DES
D
DES
Question 4 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
SHA-1 produces ..... bit of hash.
A
128
B
160
C
150
D
112
Question 5 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is not a stream cipher?
A
Two fish
B
RC5
C
RC4
D
TBONE
There are 5 questions to complete.

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