CISSP mcq questions with answer – Set 6

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• Total Number Of Questions : 10
• Passing Marks : 7
• Each Question Carry 1 Mark, No Negative Marking.
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#1. How many possible keys exist in a 4-bit key space?

4

4

8

8

16

16

128

128

#2. John recently received an email message from Bill. What cryptographic goal would need to be met to convince John that Bill was actually the sender of the message?

Nonrepudiation

Nonrepudiation

Confidentiality

Confidentiality

Availability

Availability

Integrity

Integrity

#3. What is the length of the cryptographic key used in the Data Encryption Standard (DES) cryptosystem?

56 bits

56 bits

128 bits

128 bits

192 bits

192 bits

256 bits

256 bits

#4. What type of cipher relies on changing the location of characters within a message to achieve confidentiality?

Stream cipher

Stream cipher

Transposition cipher

Transposition cipher

Block cipher

Block cipher

Substitution cipher

Substitution cipher

#5. Which one of the following is not a possible key length for the Advanced Encryption Standard Rijndael cipher?

56 bits

56 bits

128 bits

128 bits

192 bits

192 bits

256 bits

256 bits

#6. Which one of the following cannot be achieved by a secret key cryptosystem?

Nonrepudiation

Nonrepudiation

Confidentiality

Confidentiality

Availability

Availability

Key distribution

Key distribution

#7. When correctly implemented, what is the only cryptosystem known to be unbreakable?

Transposition cipher

Transposition cipher

Substitution cipher

Substitution cipher

Advanced Encryption Standard

Advanced Encryption Standard

One-time pad

One-time pad

#8. What is the output value of the mathematical function 16 mod 3?

0

0

1

1

3

3

5

5

#9. In the 1940s, a team of cryptanalysts from the United States successfully broke a Soviet code based on a one-time pad in a project known as VENONA. What rule did the Soviets break that caused this failure?

Key values must be random.

Key values must be random.

Key values must be the same length as the message.

Key values must be the same length as the message.

Key values must be used only once.

Key values must be used only once.

Key values must be protected from physical disclosure.

Key values must be protected from physical disclosure.

#10. Which one of the following cipher types operates on large pieces of a message rather than individual characters or bits of a message?

Stream cipher

Stream cipher

Caesar cipher

Caesar cipher

Block cipher

Block cipher

ROT3 cipher

ROT3 cipher

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